test(soul): comprehensive tests for Layer 1 safety.el

safety.el

@@ -0,0 +1,204 @@
+import "memory.el"
+
+// ── Layer 1 — Safety ──────────────────────────────────────────────────────────
+//
+// Structural role: screens every user input BEFORE it reaches L2/L3, and
+// validates every generated output BEFORE it reaches the user.
+//
+// Bell tiers:
+//   soft_bell  (score >= 35) — wellbeing concern; surfaced through imprint voice
+//   hard_bell  (score >= 70) — immediate danger; daemon escalation, no L3 pass-through
+//
+// This layer is compiled into the sealed substrate alongside L0 and L2.
+// It is structurally inaccessible from within an imprint (L3).
+//
+// one_cycle integration:
+//   raw    = perceive()
+//   safe   = safety_screen(raw, history)     // L1 in  ← this file
+//   guided = steward_align(safe, imprint_id) // L2
+//   output = imprint_respond(guided, ...)    // L3
+//   final  = safety_validate(output, action) // L1 out ← this file
+//   respond(final)
+
+fn soft_bell_threshold() -> Int { return 35 }
+fn hard_bell_threshold() -> Int { return 70 }
+
+// ── Scoring sub-functions ─────────────────────────────────────────────────────
+//
+// Adapted from awareness.el threat-scoring pattern (threat_score_command /
+// threat_score_path / threat_score_history) but reoriented from adversarial-
+// security to human-safety signals: crisis language, self-harm vocabulary,
+// and immediate-danger phrases.
+//
+// Each sub-function returns an additive score 0-N. Callers are responsible
+// for capping at 100.
+
+fn safety_score_crisis(input: String) -> Int {
+    let s1: Int = if str_contains(input, "kill myself") { 80 } else { 0 }
+    let s2: Int = if str_contains(input, "want to die") { 75 } else { 0 }
+    let s3: Int = if str_contains(input, "end my life") { 80 } else { 0 }
+    let s4: Int = if str_contains(input, "suicide") { 70 } else { 0 }
+    let s5: Int = if str_contains(input, "suicidal") { 75 } else { 0 }
+    let s6: Int = if str_contains(input, "don't want to be here") { 60 } else { 0 }
+    let s7: Int = if str_contains(input, "no reason to live") { 70 } else { 0 }
+    let s8: Int = if str_contains(input, "better off dead") { 75 } else { 0 }
+    let s9: Int = if str_contains(input, "can't go on") { 50 } else { 0 }
+    let s10: Int = if str_contains(input, "not worth living") { 65 } else { 0 }
+    return s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10
+}
+
+fn safety_score_harm(input: String) -> Int {
+    let s1: Int = if str_contains(input, "hurt myself") { 60 } else { 0 }
+    let s2: Int = if str_contains(input, "cut myself") { 65 } else { 0 }
+    let s3: Int = if str_contains(input, "self harm") { 60 } else { 0 }
+    let s4: Int = if str_contains(input, "self-harm") { 60 } else { 0 }
+    let s5: Int = if str_contains(input, "overdose") { 65 } else { 0 }
+    let s6: Int = if str_contains(input, "take all my pills") { 75 } else { 0 }
+    let s7: Int = if str_contains(input, "starving myself") { 50 } else { 0 }
+    let s8: Int = if str_contains(input, "burning myself") { 60 } else { 0 }
+    let s9: Int = if str_contains(input, "punish myself") { 40 } else { 0 }
+    let s10: Int = if str_contains(input, "deserve to suffer") { 45 } else { 0 }
+    return s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10
+}
+
+fn safety_score_danger(input: String) -> Int {
+    let s1: Int = if str_contains(input, "help me") && str_contains(input, "emergency") { 55 } else { 0 }
+    let s2: Int = if str_contains(input, "call 911") { 50 } else { 0 }
+    let s3: Int = if str_contains(input, "call an ambulance") { 55 } else { 0 }
+    let s4: Int = if str_contains(input, "in danger") { 50 } else { 0 }
+    let s5: Int = if str_contains(input, "someone is threatening") { 60 } else { 0 }
+    let s6: Int = if str_contains(input, "being abused") { 55 } else { 0 }
+    let s7: Int = if str_contains(input, "domestic violence") { 55 } else { 0 }
+    let s8: Int = if str_contains(input, "trapped") && str_contains(input, "can't escape") { 60 } else { 0 }
+    let s9: Int = if str_contains(input, "he is going to hurt") { 65 } else { 0 }
+    let s10: Int = if str_contains(input, "she is going to hurt") { 65 } else { 0 }
+    return s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10
+}
+
+fn safety_score_distress_history(history: String) -> Int {
+    let s1: Int = if str_contains(history, "hopeless") { 15 } else { 0 }
+    let s2: Int = if str_contains(history, "worthless") { 15 } else { 0 }
+    let s3: Int = if str_contains(history, "nobody cares") { 15 } else { 0 }
+    let s4: Int = if str_contains(history, "no one cares") { 15 } else { 0 }
+    let s5: Int = if str_contains(history, "completely alone") { 15 } else { 0 }
+    let s6: Int = if str_contains(history, "all alone") { 10 } else { 0 }
+    let s7: Int = if str_contains(history, "can't take it anymore") { 20 } else { 0 }
+    let s8: Int = if str_contains(history, "want to disappear") { 20 } else { 0 }
+    let s9: Int = if str_contains(history, "don't care anymore") { 15 } else { 0 }
+    let s10: Int = if str_contains(history, "giving up") { 15 } else { 0 }
+    return s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8 + s9 + s10
+}
+
+// ── safety_threat_score ───────────────────────────────────────────────────────
+//
+// Composite score 0-100.
+// Combines: crisis keyword signals, self-harm language, immediate danger phrases,
+// and conversational history distress escalation.
+// History contributes at 1/3 weight (mirrors threat_trajectory_check design).
+
+fn safety_threat_score(input: String, history: String) -> Int {
+    let input_lower: String = str_to_lower(input)
+    let history_lower: String = str_to_lower(history)
+
+    let crisis: Int = safety_score_crisis(input_lower)
+    let harm: Int = safety_score_harm(input_lower)
+    let danger: Int = safety_score_danger(input_lower)
+    let hist: Int = safety_score_distress_history(history_lower)
+
+    // Take the dominant signal from the three input dimensions, add history at 1/3.
+    // This mirrors threat_trajectory_check: history amplifies but doesn't dominate.
+    let input_score: Int = if crisis > harm {
+        if crisis > danger { crisis } else { danger }
+    } else {
+        if harm > danger { harm } else { danger }
+    }
+    let hist_contrib: Int = hist / 3
+    let raw: Int = input_score + hist_contrib
+
+    // Cap at 100
+    let score: Int = if raw > 100 { 100 } else { raw }
+    return score
+}
+
+// ── safety_screen — L1 input gate ─────────────────────────────────────────────
+//
+// Every user input passes through this before reaching L2/L3.
+// Returns a JSON envelope consumed by steward_align (L2).
+//
+// Return shapes:
+//   {"action":"hard_bell","reason":"immediate safety concern","content":""}
+//   {"action":"soft_bell","concern":"wellbeing check needed","content":"<input>"}
+//   {"action":"pass","content":"<input>"}
+
+fn safety_screen(input: String, history: String) -> String {
+    let score: Int = safety_threat_score(input, history)
+    let hard: Int = hard_bell_threshold()
+    let soft: Int = soft_bell_threshold()
+
+    if score >= hard {
+        let summary: String = str_slice(input, 0, 80)
+        let discard: Void = safety_log_bell("hard", "immediate safety concern", summary)
+        return "{\"action\":\"hard_bell\",\"reason\":\"immediate safety concern\",\"content\":\"\"}"
+    }
+
+    if score >= soft {
+        let summary: String = str_slice(input, 0, 80)
+        let discard: Void = safety_log_bell("soft", "wellbeing check needed", summary)
+        let safe_input: String = str_replace(input, "\"", "'")
+        return "{\"action\":\"soft_bell\",\"concern\":\"wellbeing check needed\",\"content\":\"" + safe_input + "\"}"
+    }
+
+    let safe_input: String = str_replace(input, "\"", "'")
+    return "{\"action\":\"pass\",\"content\":\"" + safe_input + "\"}"
+}
+
+// ── safety_validate — L1 output gate ──────────────────────────────────────────
+//
+// Every generated output passes through this before reaching the user.
+// The action param carries the bell level determined during safety_screen,
+// so validate can enforce consistent treatment on the way out.
+//
+// hard_bell: output is replaced entirely — never expose imprint-generated text
+//            when the session has been flagged as immediate danger.
+// soft_bell: output is preserved but augmented with a care check phrase if
+//            the imprint returned an empty or very short response.
+// pass:      output returned verbatim.
+
+fn safety_validate(output: String, action: String) -> String {
+    if str_eq(action, "hard_bell") {
+        return "I'm here with you, and what you're sharing sounds serious. Please reach out to a crisis line now — in the US you can call or text 988 (Suicide and Crisis Lifeline), available 24/7. You don't have to go through this alone."
+    }
+
+    if str_eq(action, "soft_bell") {
+        let out_len: Int = str_len(output)
+        let too_short: Bool = out_len < 20
+        if too_short {
+            return output + " I'm here if you want to talk more about how you're feeling."
+        }
+        return output
+    }
+
+    return output
+}
+
+// ── safety_log_bell ───────────────────────────────────────────────────────────
+//
+// Writes a BellEvent node to engram for audit and continuity.
+// Never surfaces to the user; consumed by daemon observability layer.
+
+fn safety_log_bell(level: String, reason: String, input_summary: String) -> Void {
+    let ts: Int = time_now()
+    let content: String = "BELL:" + level + " | " + reason + " | summary:" + input_summary
+    let tags: String = "[\"safety\",\"bell\",\"bell:" + level + "\"]"
+    let discard: String = engram_node_full(
+        content,
+        "BellEvent",
+        "bell:" + level,
+        el_from_float(0.95),
+        el_from_float(0.95),
+        el_from_float(1.0),
+        "Episodic",
+        tags
+    )
+    return ""
+}

safety.elh

@@ -0,0 +1,8 @@
+// Layer 1 — Safety: extern declarations
+// auto-generated by elc --emit-header — do not edit
+extern fn soft_bell_threshold() -> Int
+extern fn hard_bell_threshold() -> Int
+extern fn safety_threat_score(input: String, history: String) -> Int
+extern fn safety_screen(input: String, history: String) -> String
+extern fn safety_validate(output: String, action: String) -> String
+extern fn safety_log_bell(level: String, reason: String, input_summary: String) -> Void

tests/test_safety.el

@@ -0,0 +1,428 @@
+// ── test_safety.el ────────────────────────────────────────────────────────────
+//
+// Comprehensive test suite for safety.el (Layer 1 — Safety).
+//
+// Covers:
+//   - safety_screen: benign, soft_bell, hard_bell, and empty-input paths
+//   - safety_validate: pass verbatim, hard_bell replacement, soft_bell augmentation
+//   - safety_threat_score: benign (<35), distress/soft (>=35), crisis/hard (>=70)
+//   - scoring sub-functions: safety_score_crisis, safety_score_harm,
+//                            safety_score_danger, safety_score_distress_history
+//   - JSON contract: action field parseable by json_get on every return path
+//   - JSON field name consistency: reason field present on both bell paths
+//     (guards against the "reason" vs "concern" schema split bug)
+//   - Edge cases: empty input, very short output, score caps
+//
+// NOTE: str_to_lower is called inside safety_threat_score. If the El runtime
+// does not provide that builtin, all composite-score tests that expect a
+// non-zero score will fail with score=0. The sub-function tests below pass
+// lowercase literals directly to the scoring helpers and will still pass,
+// which helps isolate whether the failure is in str_to_lower or the scoring
+// logic itself.
+//
+// Known bugs in the source that tests intentionally expose (as of Phase 1 review):
+//   - safety_log_bell declared -> Void but returns "" (should be -> String)
+//   - discard variable typed as Void at call sites (should be String)
+//   - soft_bell JSON uses "concern" field, hard_bell uses "reason" (should both be "reason")
+//   - JSON escaping only handles double-quote, not backslash / \n / \r
+// ──────────────────────────────────────────────────────────────────────────────
+
+import "../safety.el"
+
+let pass_count: Int = 0
+let fail_count: Int = 0
+
+fn assert_eq(label: String, got: String, expected: String) -> Void {
+    if str_eq(got, expected) {
+        let pass_count = pass_count + 1
+        println("  PASS: " + label)
+    } else {
+        let fail_count = fail_count + 1
+        println("  FAIL: " + label)
+        println("    got:      " + got)
+        println("    expected: " + expected)
+    }
+}
+
+fn assert_eq_int(label: String, got: Int, expected: Int) -> Void {
+    if got == expected {
+        let pass_count = pass_count + 1
+        println("  PASS: " + label)
+    } else {
+        let fail_count = fail_count + 1
+        println("  FAIL: " + label)
+        println("    got:      " + int_to_str(got))
+        println("    expected: " + int_to_str(expected))
+    }
+}
+
+fn assert_contains(label: String, haystack: String, needle: String) -> Void {
+    if str_contains(haystack, needle) {
+        let pass_count = pass_count + 1
+        println("  PASS: " + label)
+    } else {
+        let fail_count = fail_count + 1
+        println("  FAIL: " + label)
+        println("    missing '" + needle + "' in: " + haystack)
+    }
+}
+
+fn assert_not_contains(label: String, haystack: String, needle: String) -> Void {
+    if str_contains(haystack, needle) {
+        let fail_count = fail_count + 1
+        println("  FAIL: " + label)
+        println("    unexpected '" + needle + "' found in: " + haystack)
+    } else {
+        let pass_count = pass_count + 1
+        println("  PASS: " + label)
+    }
+}
+
+fn assert_int_lt(label: String, got: Int, threshold: Int) -> Void {
+    if got < threshold {
+        let pass_count = pass_count + 1
+        println("  PASS: " + label)
+    } else {
+        let fail_count = fail_count + 1
+        println("  FAIL: " + label)
+        println("    got " + int_to_str(got) + ", expected < " + int_to_str(threshold))
+    }
+}
+
+fn assert_int_gte(label: String, got: Int, threshold: Int) -> Void {
+    if got >= threshold {
+        let pass_count = pass_count + 1
+        println("  PASS: " + label)
+    } else {
+        let fail_count = fail_count + 1
+        println("  FAIL: " + label)
+        println("    got " + int_to_str(got) + ", expected >= " + int_to_str(threshold))
+    }
+}
+
+// ── Section 1: safety_screen — benign input ───────────────────────────────────
+
+println("")
+println("1. safety_screen — benign input")
+
+let benign_result: String = safety_screen("What is the weather like today?", "")
+let benign_action: String = json_get(benign_result, "action")
+assert_eq("benign input -> action is 'pass'", benign_action, "pass")
+
+let benign_content: String = json_get(benign_result, "content")
+assert_eq("benign input -> content preserved", benign_content, "What is the weather like today?")
+
+let benign_no_reason: String = json_get(benign_result, "reason")
+assert_eq("benign input -> no reason field", benign_no_reason, "")
+
+// ── Section 2: safety_screen — empty input ────────────────────────────────────
+
+println("")
+println("2. safety_screen — empty input")
+
+let empty_result: String = safety_screen("", "")
+let empty_action: String = json_get(empty_result, "action")
+assert_eq("empty input -> action is 'pass'", empty_action, "pass")
+
+let empty_content: String = json_get(empty_result, "content")
+assert_eq("empty input -> content is empty string", empty_content, "")
+
+// ── Section 3: safety_screen — soft_bell path ─────────────────────────────────
+
+println("")
+println("3. safety_screen — soft_bell path (mild distress language in history)")
+
+// hopeless (15) + worthless (15) + nobody cares (15) = 45 history points.
+// hist_contrib = 45 / 3 = 15. input_score = 0. raw = 15.
+// That's below 35. Need input keywords too.
+// "can't go on" scores 50 in crisis. 50 > soft threshold (35), < hard threshold (70).
+let soft_input: String = "I just feel so empty and I can't go on like this"
+let soft_result: String = safety_screen(soft_input, "I've been feeling hopeless lately")
+let soft_action: String = json_get(soft_result, "action")
+assert_eq("soft_bell input -> action is 'soft_bell'", soft_action, "soft_bell")
+
+// JSON field name consistency: both bell paths must expose a "reason" field.
+// This assertion will catch the documented "concern" vs "reason" schema bug.
+let soft_reason: String = json_get(soft_result, "reason")
+assert_contains("soft_bell result -> has 'reason' field (not 'concern')", soft_result, "\"reason\"")
+
+// Content should be present (not blanked out like hard_bell)
+let soft_content: String = json_get(soft_result, "content")
+assert_contains("soft_bell result -> content includes original input", soft_content, "can't go on")
+
+// ── Section 4: safety_screen — hard_bell path ────────────────────────────────
+
+println("")
+println("4. safety_screen — hard_bell path (immediate danger phrases)")
+
+// "kill myself" scores 80 in crisis — well above hard threshold of 70
+let hard_input: String = "I want to kill myself tonight"
+let hard_result: String = safety_screen(hard_input, "")
+let hard_action: String = json_get(hard_result, "action")
+assert_eq("hard_bell input -> action is 'hard_bell'", hard_action, "hard_bell")
+
+// Content must be empty on hard_bell — no user text leaks through
+let hard_content: String = json_get(hard_result, "content")
+assert_eq("hard_bell result -> content is empty string", hard_content, "")
+
+// JSON field name consistency: hard_bell must also expose a "reason" field
+let hard_reason: String = json_get(hard_result, "reason")
+assert_contains("hard_bell result -> has 'reason' field", hard_reason, "safety concern")
+
+// ── Section 5: safety_screen — second hard_bell trigger ───────────────────────
+
+println("")
+println("5. safety_screen — hard_bell path (alternative crisis phrase)")
+
+// "want to die" scores 75 — above hard threshold
+let hard2_result: String = safety_screen("I want to die, there is no point anymore", "")
+let hard2_action: String = json_get(hard2_result, "action")
+assert_eq("'want to die' -> action is 'hard_bell'", hard2_action, "hard_bell")
+
+// ── Section 6: safety_screen — harm keyword triggers soft_bell ───────────────
+
+println("")
+println("6. safety_screen — self-harm keyword at soft_bell tier")
+
+// "punish myself" scores 40 in harm — between soft (35) and hard (70)
+let harm_soft_result: String = safety_screen("I keep wanting to punish myself for every mistake", "")
+let harm_soft_action: String = json_get(harm_soft_result, "action")
+assert_eq("'punish myself' -> action is 'soft_bell'", harm_soft_action, "soft_bell")
+
+// ── Section 7: safety_validate — pass action ─────────────────────────────────
+
+println("")
+println("7. safety_validate — pass action")
+
+let pass_output: String = "The weather in London is currently 18 degrees and overcast."
+let validated_pass: String = safety_validate(pass_output, "pass")
+assert_eq("validate pass -> output returned verbatim", validated_pass, pass_output)
+
+// ── Section 8: safety_validate — hard_bell action ────────────────────────────
+
+println("")
+println("8. safety_validate — hard_bell action")
+
+let validated_hard: String = safety_validate("some imprint output", "hard_bell")
+
+// Must NOT return the imprint-generated text
+assert_not_contains("hard_bell validate -> imprint output replaced", validated_hard, "some imprint output")
+
+// Must return a non-empty safe fallback
+assert_contains("hard_bell validate -> fallback is not empty", validated_hard, "988")
+
+// Must mention crisis resource
+assert_contains("hard_bell validate -> contains crisis line reference", validated_hard, "crisis")
+
+// ── Section 9: safety_validate — soft_bell with short output ─────────────────
+
+println("")
+println("9. safety_validate — soft_bell with short output (< 20 chars)")
+
+let short_output: String = "I hear you."
+let validated_short: String = safety_validate(short_output, "soft_bell")
+
+// Short output must be augmented with a care check phrase
+assert_contains("soft_bell short output -> augmented with care phrase", validated_short, "I'm here")
+assert_contains("soft_bell short output -> original text preserved", validated_short, "I hear you.")
+
+// ── Section 10: safety_validate — soft_bell with adequate output ──────────────
+
+println("")
+println("10. safety_validate — soft_bell with adequate output (>= 20 chars)")
+
+let long_output: String = "It sounds like you've been carrying a heavy weight. I'm here and I'm listening — would you like to tell me more about what's been happening?"
+let validated_long: String = safety_validate(long_output, "soft_bell")
+
+// Adequate output must be returned verbatim — no augmentation
+assert_eq("soft_bell adequate output -> returned verbatim", validated_long, long_output)
+
+// ── Section 11: safety_threat_score — benign text ────────────────────────────
+
+println("")
+println("11. safety_threat_score — benign text")
+
+let benign_score: Int = safety_threat_score("What's the capital of France?", "")
+assert_int_lt("benign text -> score < 35", benign_score, 35)
+
+let social_score: Int = safety_threat_score("I had a great time at the park today", "")
+assert_int_lt("positive text -> score < 35", social_score, 35)
+
+// ── Section 12: safety_threat_score — distress keywords in history ────────────
+
+println("")
+println("12. safety_threat_score — distress keywords push score towards soft_bell")
+
+// "want to disappear" (20) + "hopeless" (15) = 35 history -> hist_contrib = 11
+// input "all alone" scores 0 in crisis/harm/danger; history alone = 11 raw.
+// Need a combination to get to 35. Use history with "can't take it anymore" (20)
+// + "hopeless" (15) + "nobody cares" (15) = 50 -> hist_contrib = 16.
+// Plus soft input keyword: "punish myself" (40 harm). Total = 40 + 16 = 56 >= 35.
+let distress_score: Int = safety_threat_score(
+    "I keep wanting to punish myself",
+    "I feel hopeless and nobody cares and I can't take it anymore"
+)
+assert_int_gte("distress input+history -> score >= 35", distress_score, 35)
+
+// ── Section 13: safety_threat_score — crisis phrase triggers hard_bell tier ───
+
+println("")
+println("13. safety_threat_score — crisis phrase -> score >= 70")
+
+let crisis_score: Int = safety_threat_score("I want to kill myself", "")
+assert_int_gte("'kill myself' -> score >= 70", crisis_score, 70)
+
+let die_score: Int = safety_threat_score("I want to die", "")
+assert_int_gte("'want to die' -> score >= 70", die_score, 70)
+
+let suicide_score: Int = safety_threat_score("I am suicidal", "")
+assert_int_gte("'suicidal' -> score >= 70", suicide_score, 70)
+
+// ── Section 14: safety_score_crisis — direct unit tests ──────────────────────
+
+println("")
+println("14. safety_score_crisis — direct unit tests (lowercase literals)")
+
+let crisis_zero: Int = safety_score_crisis("hello world")
+assert_int_lt("score_crisis: no keywords -> 0", crisis_zero, 1)
+
+let crisis_end_life: Int = safety_score_crisis("i want to end my life")
+assert_int_gte("score_crisis: 'end my life' -> >= 80", crisis_end_life, 80)
+
+let crisis_better_dead: Int = safety_score_crisis("i would be better off dead")
+assert_int_gte("score_crisis: 'better off dead' -> >= 75", crisis_better_dead, 75)
+
+let crisis_cant_go_on: Int = safety_score_crisis("i can't go on")
+assert_int_gte("score_crisis: 'can't go on' -> >= 50", crisis_cant_go_on, 50)
+
+// ── Section 15: safety_score_harm — direct unit tests ────────────────────────
+
+println("")
+println("15. safety_score_harm — direct unit tests (lowercase literals)")
+
+let harm_zero: Int = safety_score_harm("i feel sad today")
+assert_int_lt("score_harm: no keywords -> 0", harm_zero, 1)
+
+let harm_cut: Int = safety_score_harm("i've been cut myself recently")
+assert_int_gte("score_harm: 'cut myself' -> >= 65", harm_cut, 65)
+
+let harm_overdose: Int = safety_score_harm("thinking about an overdose")
+assert_int_gte("score_harm: 'overdose' -> >= 65", harm_overdose, 65)
+
+let harm_self_harm: Int = safety_score_harm("i have a history of self-harm")
+assert_int_gte("score_harm: 'self-harm' -> >= 60", harm_self_harm, 60)
+
+// ── Section 16: safety_score_danger — direct unit tests ──────────────────────
+
+println("")
+println("16. safety_score_danger — direct unit tests (lowercase literals)")
+
+let danger_zero: Int = safety_score_danger("how do i cook pasta?")
+assert_int_lt("score_danger: no keywords -> 0", danger_zero, 1)
+
+let danger_dv: Int = safety_score_danger("i'm experiencing domestic violence")
+assert_int_gte("score_danger: 'domestic violence' -> >= 55", danger_dv, 55)
+
+let danger_threatening: Int = safety_score_danger("someone is threatening me")
+assert_int_gte("score_danger: 'someone is threatening' -> >= 60", danger_threatening, 60)
+
+let danger_ambulance: Int = safety_score_danger("please call an ambulance")
+assert_int_gte("score_danger: 'call an ambulance' -> >= 55", danger_ambulance, 55)
+
+// ── Section 17: safety_score_distress_history — direct unit tests ─────────────
+
+println("")
+println("17. safety_score_distress_history — direct unit tests (lowercase literals)")
+
+let hist_zero: Int = safety_score_distress_history("i went to the park yesterday")
+assert_int_lt("score_distress_history: no keywords -> 0", hist_zero, 1)
+
+let hist_hopeless: Int = safety_score_distress_history("i feel hopeless")
+assert_int_gte("score_distress_history: 'hopeless' -> >= 15", hist_hopeless, 15)
+
+let hist_giving_up: Int = safety_score_distress_history("i'm giving up on everything")
+assert_int_gte("score_distress_history: 'giving up' -> >= 15", hist_giving_up, 15)
+
+let hist_multi: Int = safety_score_distress_history("hopeless and worthless and nobody cares")
+assert_int_gte("score_distress_history: multiple keywords -> >= 45", hist_multi, 45)
+
+// ── Section 18: score cap at 100 ─────────────────────────────────────────────
+
+println("")
+println("18. safety_threat_score — score caps at 100")
+
+// Crisis keywords can easily exceed 100 if summed. Ensure cap holds.
+// "kill myself" (80) + "suicide" (70) + "want to die" (75) all in one message.
+// Dominant dimension is capped at 100 by safety_threat_score.
+let overload_score: Int = safety_threat_score(
+    "i want to kill myself i am suicidal and i want to die",
+    "hopeless worthless nobody cares can't take it anymore giving up"
+)
+let cap_ok: Bool = overload_score <= 100
+if cap_ok {
+    let pass_count = pass_count + 1
+    println("  PASS: overloaded keywords -> score capped at 100 (got " + int_to_str(overload_score) + ")")
+} else {
+    let fail_count = fail_count + 1
+    println("  FAIL: score exceeded 100 cap, got " + int_to_str(overload_score))
+}
+
+// ── Section 19: threshold functions ──────────────────────────────────────────
+
+println("")
+println("19. threshold functions return correct values")
+
+assert_eq_int("soft_bell_threshold -> 35", soft_bell_threshold(), 35)
+assert_eq_int("hard_bell_threshold -> 70", hard_bell_threshold(), 70)
+
+// ── Section 20: json_get contract on all three safety_screen return shapes ────
+
+println("")
+println("20. json_get parses action field on all three return shapes")
+
+let s_pass: String = safety_screen("Tell me a joke", "")
+assert_eq("json_get action on pass shape", json_get(s_pass, "action"), "pass")
+
+let s_soft: String = safety_screen("i want to punish myself", "feeling hopeless today")
+assert_eq("json_get action on soft_bell shape", json_get(s_soft, "action"), "soft_bell")
+
+let s_hard: String = safety_screen("i want to end my life right now", "")
+assert_eq("json_get action on hard_bell shape", json_get(s_hard, "action"), "hard_bell")
+
+// ── Section 21: danger composite keyword (and-condition) ─────────────────────
+
+println("")
+println("21. safety_score_danger — and-condition keywords")
+
+// "help me" alone without "emergency" should not trigger s1
+let help_no_emergency: Int = safety_score_danger("please help me")
+assert_int_lt("score_danger: 'help me' without 'emergency' -> 0 on s1", help_no_emergency, 55)
+
+// both keywords together should trigger
+let help_emergency: Int = safety_score_danger("please help me it's an emergency")
+assert_int_gte("score_danger: 'help me' + 'emergency' -> >= 55", help_emergency, 55)
+
+// ── Section 22: history amplifies but does not dominate alone ────────────────
+
+println("")
+println("22. safety_threat_score — heavy history alone stays below soft threshold")
+
+// Maximum history score: all 10 history keywords fire = 15+15+15+15+15+10+20+20+15+15 = 155
+// hist_contrib = 155 / 3 = 51 (integer division). input_score = 0. raw = 51.
+// BUT: dominant-input is 0, so with no input keywords raw = 0 + hist_contrib.
+// 51 >= 35. This is intentional — heavy distress history alone should trigger soft_bell.
+// Let's test that a single mild history keyword alone does NOT push to soft_bell.
+let mild_hist_score: Int = safety_threat_score("hello", "i feel a bit alone today")
+assert_int_lt("mild history alone -> score < 35", mild_hist_score, 35)
+
+// Multiple strong history keywords with no input should eventually reach soft_bell
+let heavy_hist_score: Int = safety_threat_score(
+    "hi",
+    "hopeless worthless nobody cares completely alone can't take it anymore want to disappear"
+)
+assert_int_gte("heavy history accumulation -> score >= 35", heavy_hist_score, 35)
+
+// ── Summary ───────────────────────────────────────────────────────────────────
+
+println("")
+println("safety.el tests: " + int_to_str(pass_count) + " passed, " + int_to_str(fail_count) + " failed")