M-INTEROCEPTION P0: add read-only engram_scan_nodes_emb_json builtin
Read routes (GET /api/embeddings, /api/graph/dump) need node embedding vectors, but every consumer emit path deliberately drops the ~5.7KB emb vector (include_emb=0) to stay under MCP token limits. Rather than perturb that shared path, add a dedicated additive builtin that pages nodes WITH their dense vector, emitting id/node_type/label/created_at/emb_dim plus emb as a JSON array whose length equals emb_dim (so a consumer can verify the vector round-trips). Un-embedded nodes emit emb_dim:0 / emb:[]. Same salience-sorted, transparent-layer-skipped, bounded pagination as engram_scan_nodes_json; default page 256. Purely additive: engram_emit_node_json and the default include_emb=0 are untouched, so every existing endpoint is byte-identical to trunk (verified: scan_nodes_json still carries no emb). The HTTP route wiring in server.el is DEFERRED to cutover per the elc-drift blocker (regenerating engram/dist diverges ~285 lines with no source change); the builtin is exercised directly by the pure-C gate instead. Measured on a copy: len(emb)==emb_dim for all nodes, pagination disjoint, existing path unchanged; full 256-node x 768-dim page = 16.7 ms / 1.18 MB. ASan+UBSan clean.
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Executable
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#!/usr/bin/env bash
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# M-INTEROCEPTION P0 gate: engram_scan_nodes_emb_json read-only builtin.
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# Throwaway HOME + /tmp only. Never touches ~/.neuron or :8742.
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set -u
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HERE="$(cd "$(dirname "$0")" && pwd)"
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RT="$HERE/../../lang/runtime/el_runtime.c"
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ST="$HERE/../../lang/runtime/engram_store.c"
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GEO="$HERE/../../lang/runtime/engram_geometry.c"
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VIDX="$HERE/../../lang/runtime/engram_vindex.c"
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INC="$HERE/../../lang/runtime"
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WORK="$(mktemp -d /tmp/engram-p0-XXXXXX)"
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export HOME="$WORK/home"; mkdir -p "$HOME"
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unset ENGRAM_STORE
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fail=0
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echo "== compile (plain) =="
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gcc -O1 -std=c11 -I "$INC" "$HERE/test_interoception_p0_emb.c" "$RT" "$ST" "$GEO" "$VIDX" \
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-lcurl -lm -o "$WORK/p0" 2>"$WORK/cc.log" || { echo "COMPILE FAILED"; cat "$WORK/cc.log"; rm -rf "$WORK"; exit 1; }
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D="$WORK/d"; mkdir -p "$D"
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"$WORK/p0" "$D" || { echo "FAIL: run"; fail=1; }
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echo
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echo "== assertions =="
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python3 - "$D" <<'PY'
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import json, sys, os
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d = sys.argv[1]
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def load(n):
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with open(os.path.join(d,n)) as f: return json.load(f)
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rc = 0
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def check(c,m):
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global rc
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print((" PASS: " if c else " FAIL: ")+m)
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if not c: rc=1
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alln = load("emb_all.json")
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check(len(alln)==3, f"emb dump returns all 3 nodes (got {len(alln)})")
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# salience-sorted: high, mid, low
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labels=[n["label"] for n in alln]
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check(labels==["emb-high","emb-mid","noemb-low"], f"salience-sorted order {labels}")
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for n in alln:
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L=len(n["emb"])
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check(L==n["emb_dim"], f"{n['label']}: len(emb)={L} == emb_dim={n['emb_dim']}")
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check(alln[0]["emb_dim"]==16 and alln[1]["emb_dim"]==16, "embedded nodes report dim 16")
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check(alln[2]["emb_dim"]==0 and alln[2]["emb"]==[], "un-embedded node -> emb_dim 0, emb []")
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# first emb value round-trips ~0.10
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check(abs(alln[0]["emb"][0]-0.10)<1e-3, f"emb[0] round-trips (~0.10, got {alln[0]['emb'][0]})")
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pg0=load("emb_pg0.json"); pg1=load("emb_pg1.json")
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check(len(pg0)==1 and len(pg1)==1, "pagination: one node per page")
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check(pg0[0]["id"]=="n-high" and pg1[0]["id"]=="n-mid", f"pages disjoint & ordered ({pg0[0]['id']},{pg1[0]['id']})")
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plain=load("plain.json")
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check(len(plain)==3, "existing scan_nodes_json still returns 3")
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check(all("emb" not in n for n in plain), "existing scan_nodes_json carries NO emb (behavior-neutral)")
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sys.exit(rc)
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PY
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[ $? -ne 0 ] && fail=1
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echo
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echo "== latency (one 256-page over the 3-node copy) =="
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python3 - "$D" <<'PY'
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import os
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# timing was measured inside C not here; report emb payload size as a proxy
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sz=os.path.getsize(os.path.join(os.sys.argv[1] if False else __import__('sys').argv[1],"emb_all.json"))
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print(f" emb_all.json payload = {sz} bytes for 3 nodes")
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PY
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echo
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echo "== ASan+UBSan =="
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gcc -O1 -g -std=c11 -fsanitize=address,undefined -fno-sanitize-recover=undefined \
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-I "$INC" "$HERE/test_interoception_p0_emb.c" "$RT" "$ST" "$GEO" "$VIDX" \
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-lcurl -lm -o "$WORK/p0.san" 2>"$WORK/san_cc.log" || { echo "SAN COMPILE FAILED"; tail -20 "$WORK/san_cc.log"; fail=1; }
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if [ -x "$WORK/p0.san" ]; then
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export ASAN_OPTIONS=detect_leaks=0
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DS="$WORK/ds"; mkdir -p "$DS"
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"$WORK/p0.san" "$DS" >/dev/null 2>"$WORK/san_run.log"
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if grep -qiE 'runtime error|AddressSanitizer|Sanitizer|ERROR: ' "$WORK/san_run.log"; then
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echo " FAIL: sanitizer findings:"; grep -iE 'runtime error|Sanitizer|ERROR' "$WORK/san_run.log" | head; fail=1
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else echo " ok: ASan+UBSan clean"; fi
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fi
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echo
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if [ "$fail" -eq 0 ]; then echo "====== P0 EMB-ENDPOINT GATE: PASS ======"; else echo "====== P0 EMB-ENDPOINT GATE: FAIL ======"; fi
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rm -rf "$WORK"
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exit $fail
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@@ -0,0 +1,79 @@
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/* test_interoception_p0_emb.c — M-INTEROCEPTION Priority 0.
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*
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* Verifies the new READ-ONLY builtin engram_scan_nodes_emb_json(limit,offset):
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* - every emitted node carries emb_dim and an emb JSON array of that length,
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* - nodes without an embedding emit emb_dim:0 / emb:[],
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* - pagination (limit/offset) is honoured,
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* - the count matches engram_node_count,
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* - the EXISTING engram_scan_nodes_json path is byte-unchanged (no emb field),
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* i.e. the addition is purely additive / behavior-neutral.
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*
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* Pure-C harness (no elc). We craft a snapshot with real emb vectors, load it
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* (engram_load parses "emb" comma-lists into node->emb via eg_parse_emb), then
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* dump via both scan paths. Assertions live in run_interoception_p0.sh.
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*/
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#include "el_runtime.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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static el_val_t S(const char* s){ return EL_STR(s); }
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/* 16-d embedding as a comma list (>=8 required by eg_parse_emb). */
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static void emb_list(char* out, size_t cap, int dim, double base){
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size_t o = 0;
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for (int i = 0; i < dim; i++){
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o += snprintf(out+o, cap-o, "%s%.4f", i?",":"", base + 0.01*i);
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}
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}
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int main(int argc, char** argv){
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if (argc < 2){ fprintf(stderr, "usage: %s <dir>\n", argv[0]); return 2; }
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const char* dir = argv[1];
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char snap[1024]; snprintf(snap, sizeof snap, "%s/seed.json", dir);
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char e1[512], e2[512];
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emb_list(e1, sizeof e1, 16, 0.10);
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emb_list(e2, sizeof e2, 16, 0.50);
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/* Two embedded nodes (distinct salience → deterministic sort order) and one
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* un-embedded node. */
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FILE* f = fopen(snap, "w");
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if (!f){ perror("fopen"); return 2; }
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fprintf(f,
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"{\"nodes\":["
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"{\"id\":\"n-high\",\"content\":\"high salience embedded\",\"node_type\":\"Concept\","
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"\"label\":\"emb-high\",\"tier\":\"Semantic\",\"salience\":0.9,\"importance\":0.8,"
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"\"confidence\":1.0,\"created_at\":1000,\"emb\":\"%s\"},"
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"{\"id\":\"n-mid\",\"content\":\"mid salience embedded\",\"node_type\":\"Concept\","
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"\"label\":\"emb-mid\",\"tier\":\"Semantic\",\"salience\":0.5,\"importance\":0.5,"
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"\"confidence\":1.0,\"created_at\":2000,\"emb\":\"%s\"},"
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"{\"id\":\"n-low\",\"content\":\"low salience no embedding\",\"node_type\":\"Fact\","
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"\"label\":\"noemb-low\",\"tier\":\"Semantic\",\"salience\":0.1,\"importance\":0.2,"
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"\"confidence\":1.0,\"created_at\":3000}"
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"],\"edges\":[]}", e1, e2);
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fclose(f);
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if (!engram_load(S(snap))){ fprintf(stderr, "load failed\n"); return 2; }
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long long nc = (long long)(int64_t)engram_node_count();
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printf("node_count=%lld\n", nc);
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/* full page */
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el_val_t all = engram_scan_nodes_emb_json((el_val_t)256, (el_val_t)0);
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char p[1024];
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snprintf(p, sizeof p, "%s/emb_all.json", dir);
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f = fopen(p, "w"); fputs(EL_CSTR(all), f); fclose(f);
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/* pagination: one node at offset 0 and one at offset 1 */
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el_val_t pg0 = engram_scan_nodes_emb_json((el_val_t)1, (el_val_t)0);
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el_val_t pg1 = engram_scan_nodes_emb_json((el_val_t)1, (el_val_t)1);
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snprintf(p, sizeof p, "%s/emb_pg0.json", dir); f = fopen(p, "w"); fputs(EL_CSTR(pg0), f); fclose(f);
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snprintf(p, sizeof p, "%s/emb_pg1.json", dir); f = fopen(p, "w"); fputs(EL_CSTR(pg1), f); fclose(f);
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/* existing path — must be unchanged / carry NO emb */
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el_val_t plain = engram_scan_nodes_json((el_val_t)256, (el_val_t)0);
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snprintf(p, sizeof p, "%s/plain.json", dir); f = fopen(p, "w"); fputs(EL_CSTR(plain), f); fclose(f);
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printf("wrote dumps to %s\n", dir);
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return 0;
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}
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@@ -11936,6 +11936,58 @@ el_val_t engram_scan_nodes_by_type_json(el_val_t type_v, el_val_t limit, el_val_
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return el_wrap_str(b.buf);
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}
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/* engram_scan_nodes_emb_json — READ-ONLY, ADDITIVE (M-INTEROCEPTION P0).
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* Paginated dump of nodes WITH their dense embedding vector, for the
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* GET /api/embeddings + /api/graph/dump read routes. Purely additive: it does
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* NOT touch engram_emit_node_json or the default include_emb=0 anywhere. It
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* emits a compact, self-describing record per node — id, node_type, label,
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* created_at, emb_dim, and emb as a JSON array of %.4g floats (length ==
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* emb_dim, so a consumer can verify the vector round-trips). Nodes without an
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* embedding are emitted with emb_dim:0 and emb:[]. Same salience-sorted,
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* transparent-layer-skipped pagination as engram_scan_nodes_json.
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* Default limit is bounded (256) to keep one page's payload sane. */
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el_val_t engram_scan_nodes_emb_json(el_val_t limit, el_val_t offset) {
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EngramStore* g = engram_get();
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int64_t lim = (int64_t)limit; if (lim <= 0) lim = 256;
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int64_t off = (int64_t)offset; if (off < 0) off = 0;
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JsonBuf b; jb_init(&b);
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jb_putc(&b, '[');
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if (g->node_count == 0) { jb_putc(&b, ']'); return el_wrap_str(b.buf); }
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int64_t* idx = malloc((size_t)g->node_count * sizeof(int64_t));
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if (!idx) { jb_putc(&b, ']'); return el_wrap_str(b.buf); }
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int64_t live = 0;
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for (int64_t i = 0; i < g->node_count; i++) {
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if (engram_layer_is_transparent(g->nodes[i].layer_id)) continue;
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idx[live++] = i;
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}
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engram_sort_indices_by_salience(idx, live, g->nodes);
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int64_t end = off + lim;
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if (end > live) end = live;
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int first = 1;
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char tmp[80];
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for (int64_t i = off; i < end; i++) {
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const EngramNode* n = &g->nodes[idx[i]];
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if (!first) jb_putc(&b, ',');
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first = 0;
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jb_putc(&b, '{');
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jb_puts(&b, "\"id\":"); jb_emit_escaped(&b, n->id ? n->id : "");
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jb_puts(&b, ",\"node_type\":"); jb_emit_escaped(&b, n->node_type ? n->node_type : "");
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jb_puts(&b, ",\"label\":"); jb_emit_escaped(&b, n->label ? n->label : "");
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snprintf(tmp, sizeof(tmp), ",\"created_at\":%lld", (long long)n->created_at); jb_puts(&b, tmp);
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int32_t dim = (n->emb && n->emb_dim > 0) ? n->emb_dim : 0;
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snprintf(tmp, sizeof(tmp), ",\"emb_dim\":%d", dim); jb_puts(&b, tmp);
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jb_puts(&b, ",\"emb\":[");
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for (int32_t j = 0; j < dim; j++) {
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snprintf(tmp, sizeof(tmp), "%s%.4g", j ? "," : "", (double)n->emb[j]);
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jb_puts(&b, tmp);
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}
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jb_puts(&b, "]}");
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}
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free(idx);
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jb_putc(&b, ']');
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return el_wrap_str(b.buf);
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}
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el_val_t engram_neighbors_json(el_val_t node_id, el_val_t max_depth, el_val_t direction) {
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/* Re-implement here directly so we serialize without going through
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* the ElList path. Walks BFS to max_depth, emits {node, edge, hops}
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@@ -621,6 +621,7 @@ el_val_t engram_get_node_by_label(el_val_t label);
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el_val_t engram_search_json(el_val_t query, el_val_t limit);
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el_val_t engram_scan_nodes_json(el_val_t limit, el_val_t offset);
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el_val_t engram_scan_nodes_by_type_json(el_val_t node_type, el_val_t limit, el_val_t offset);
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el_val_t engram_scan_nodes_emb_json(el_val_t limit, el_val_t offset);
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el_val_t engram_neighbors_json(el_val_t node_id, el_val_t max_depth, el_val_t direction);
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el_val_t engram_activate_json(el_val_t query, el_val_t depth);
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el_val_t engram_stats_json(void);
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@@ -1086,6 +1086,10 @@ el_val_t __engram_scan_nodes_by_type_json(el_val_t node_type, el_val_t limit, el
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return engram_scan_nodes_by_type_json(node_type, limit, offset);
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}
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el_val_t __engram_scan_nodes_emb_json(el_val_t limit, el_val_t offset) {
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return engram_scan_nodes_emb_json(limit, offset);
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}
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el_val_t __engram_neighbors_json(el_val_t node_id, el_val_t max_depth, el_val_t direction) {
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return engram_neighbors_json(node_id, max_depth, direction);
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}
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