Merge PR #14: feat(soul): MCP connectors — /api/connectors proxy + per-connector auto-approve

Applies connector-specific additions from feat/connectors-soul:
- chat.el: connector_tools_json(), agentic_tools_all(), call_mcp_bridge(),
  tool_auto_approved() and mcp__ dispatch in dispatch_tool()
- routes.el: connectd_get/post, handle_connectors(), /api/connectors routing
  in GET and POST sections
- MEMORY_RECALL_BUG.md: investigation notes on memory retrieval failure

The agentic loop rewrite in the source branch was not applied — it conflicts
with the tool-bridge pattern from PR #5 which is the chosen design for
client-side MCP tool execution. The connectors themselves are now fully
wired: connector tools surface as mcp__<server>__<tool> in the tools array
and dispatch to neuron-connectd via call_mcp_bridge().

chat.el

@@ -270,6 +270,70 @@ fn agentic_tools_with_web() -> String {
     return "[" + inner + ",{\"type\":\"web_search_20250305\",\"name\":\"web_search\",\"max_uses\":5}]"
 }
 
+// ---------------------------------------------------------------------------
+// MCP connectors. The soul consumes external MCP tools through neuron-connectd,
+// the loopback bridge (Accessor) on 127.0.0.1:7771. The bridge isolates all MCP
+// wire complexity (stdio framing, SSE, OAuth, server lifecycle); the soul only
+// speaks flat HTTP. Spec: docs/research/mcp-connectors-adoption-spec.md.
+// ---------------------------------------------------------------------------
+
+// Fetch the merged, namespaced tool schemas (mcp__<srv>__<tool>) from the bridge.
+// Short timeout + empty-array fallback: if the bridge is down, the soul runs
+// exactly as before with only its built-in tools (graceful degradation).
+fn connector_tools_json() -> String {
+    let raw: String = exec_capture("curl -s --max-time 2 http://127.0.0.1:7771/mcp/tools")
+    if str_eq(raw, "") {
+        return "[]"
+    }
+    let arr: String = json_get_raw(raw, "tools")
+    if str_eq(arr, "") {
+        return "[]"
+    }
+    return arr
+}
+
+// Built-in tools + native web_search + every connector tool, as one tools array.
+// Splices connector tools in before the closing bracket of the base array.
+fn agentic_tools_all() -> String {
+    let base: String = agentic_tools_with_web()
+    let conn: String = connector_tools_json()
+    let conn_inner: String = str_slice(conn, 1, str_len(conn) - 1)
+    if str_eq(conn_inner, "") {
+        return base
+    }
+    let base_open: String = str_slice(base, 0, str_len(base) - 1)
+    return base_open + "," + conn_inner + "]"
+}
+
+// Proxy one tool call to the bridge. The model-supplied input is written to a
+// temp file and handed to curl via -d @file, so arbitrary JSON can never reach
+// the shell as an argument (no injection through tool_input).
+fn call_mcp_bridge(tool_name: String, tool_input: String) -> String {
+    let eff_input: String = if str_eq(tool_input, "") { "{}" } else { tool_input }
+    let body: String = "{\"name\":\"" + tool_name + "\",\"input\":" + eff_input + "}"
+    let tmp: String = "/tmp/neuron-mcp-call.json"
+    fs_write(tmp, body)
+    return exec_capture("curl -s --max-time 30 -X POST http://127.0.0.1:7771/mcp/call -H 'Content-Type: application/json' -d @" + tmp)
+}
+
+// Per-connector auto-approve: true only for an mcp__* tool whose server the user has
+// explicitly opted into skipping the approval card (off by default). Built-in tools are
+// never auto-approved here — they keep their existing gating. Bridge down → false (safe).
+fn tool_auto_approved(tool_name: String) -> Bool {
+    if !str_starts_with(tool_name, "mcp__") {
+        return false
+    }
+    let raw: String = exec_capture("curl -s --max-time 2 http://127.0.0.1:7771/mcp/auto-approved")
+    if str_eq(raw, "") {
+        return false
+    }
+    let list: String = json_get_raw(raw, "tools")
+    if str_eq(list, "") {
+        return false
+    }
+    return str_contains(list, "\"" + tool_name + "\"")
+}
+
 fn dispatch_tool(tool_name: String, tool_input: String) -> String {
     if str_eq(tool_name, "read_file") {
         let path: String = json_get(tool_input, "path")
@@ -297,6 +361,21 @@ fn dispatch_tool(tool_name: String, tool_input: String) -> String {
         let result: String = exec_capture(cmd)
         return json_safe(result)
     }
+    // MCP connector tools (namespaced mcp__<server>__<tool>) are routed through
+    // neuron-connectd. The bridge handles all MCP wire protocol complexity.
+    if str_starts_with(tool_name, "mcp__") {
+        let out: String = call_mcp_bridge(tool_name, tool_input)
+        if str_eq(out, "") {
+            return json_safe("MCP bridge unreachable (neuron-connectd on :7771)")
+        }
+        let content: String = json_get(out, "content")
+        if str_eq(content, "") {
+            let err: String = json_get(out, "error")
+            let msg: String = if str_eq(err, "") { "MCP call failed" } else { "MCP error: " + err }
+            return json_safe(msg)
+        }
+        return json_safe(content)
+    }
     return "unknown tool: " + tool_name
 }