fix(api): /api/neuron/list/<type> off-by-one — slice 16->17

str_slice(clean, 16, ...) left a leading slash on node_type ('/BacklogItem'), so
engram_scan_nodes_by_type_json matched nothing and list/<type> returned [] for EVERY type — silently
breaking backlog + typed-node listing across the app and MCP tools (reviewBacklog). Proven live: the
literal-scan endpoint /api/neuron/knowledge returns nodes; /api/neuron/list/Knowledge returned []. elc-clean.
NOTE: soul-core — needs dist/soul.c regen (Will); rides the same rebuild as #56/#57.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

chat.el

@@ -1688,25 +1688,12 @@ fn handle_chat_agentic(body: String) -> String {
     let safe_msg: String = json_safe(message)
     let safe_sys: String = json_safe(system)
 
-    // Vision in the agentic brain (2026-06-27): when the client attaches an image
-    // (base64 in body "image", mime in "image_media_type"), send it as a real Anthropic
-    // image content block on THIS user turn — so the model sees raw pixels WITH memory,
-    // history, and tools (parity with the CLI). img_b64 == "" => byte-identical to before.
-    let img_b64: String = json_get(body, "image")
-    let img_mt_raw: String = json_get(body, "image_media_type")
-    let img_mt: String = if str_eq(img_mt_raw, "") { "image/png" } else { img_mt_raw }
-    let cur_user_content: String = if str_eq(img_b64, "") {
-        "\"" + safe_msg + "\""
-    } else {
-        "[{\"type\":\"text\",\"text\":\"" + safe_msg + "\"},{\"type\":\"image\",\"source\":{\"type\":\"base64\",\"media_type\":\"" + img_mt + "\",\"data\":\"" + img_b64 + "\"}}]"
-    }
-
     // Seed the messages array with recent history if available, so the LLM sees the thread.
     let prior_messages: String = if agentic_hist_len > 0 {
         let inner: String = str_slice(agentic_hist, 1, str_len(agentic_hist) - 1)
-        "[" + inner + ",{\"role\":\"user\",\"content\":" + cur_user_content + "}]"
+        "[" + inner + ",{\"role\":\"user\",\"content\":\"" + safe_msg + "\"}]"
     } else {
-        "[{\"role\":\"user\",\"content\":" + cur_user_content + "}]"
+        "[{\"role\":\"user\",\"content\":\"" + safe_msg + "\"}]"
     }
     let messages: String = prior_messages
     let api_url: String = "https://api.anthropic.com/v1/messages"

routes.el

@@ -459,7 +459,10 @@ fn handle_request(method: String, path: String, body: String) -> String {
             return handle_api_inspect_graph(method, path, body)
         }
         if str_starts_with(clean, "/api/neuron/list/") {
-            let node_type: String = str_slice(clean, 16, str_len(clean))
+            // Offset 17 = len("/api/neuron/list/"). Was 16, which left a leading "/" on node_type
+            // ("/BacklogItem"), so engram_scan_nodes_by_type_json matched nothing → list/<type>
+            // returned [] for EVERY type (broke backlog/typed-node listing app- and tool-wide).
+            let node_type: String = str_slice(clean, 17, str_len(clean))
             return handle_api_list_typed(node_type, path, body)
         }
         if str_starts_with(clean, "/api/neuron/recall") {