reconcile: merge Will's self-review WIP (456267a) into main

Union of all ship-critical soul fixes for the Mac beta:
- Keeps main's honest receipts (#100/#101), immutability arc + #199 by-id
  gate (#83), Track B threat routing (#76), bounded beginSession (#103),
  CI hardening (#85/#86), elc typo hotfix (#77), neuron-dev-setup (#84).
- Brings WIP's genesis-boot SIGSEGV fix (#150/#95), safety-contact 988
  truncation fix (#96), bounded-persona floor (#93), and 10 self-review
  commits (importance flattening, curiosity DF gating, WM/heartbeat
  observability, boot-counter telemetry).
- Folds the multi-word ranked-search fix: api_query_param now url_decode()s
  the extracted value so q=foo%20bar / foo+bar tokenize as two words.

Conflicts (neuron-api.el payload-bound comments, mcp-wrapper tool_forget)
resolved toward the correct end state: main's verified honest-receipt
read-back is kept; WIP's improved forget description is kept. Generated
dist/*.c taken from main and will be regenerated from this reconciled
source in the following commit.

soul.el

@@ -346,6 +346,12 @@ fn emit_session_start_event() -> Void {
         el_from_float(0.9), el_from_float(0.9), el_from_float(1.0),
         "Episodic", tags
     )
+    // ALSO post to the HTTP Engram stream via ise_post (2026-07-28 self-review):
+    // engram_node_full above writes only the soul's in-process store, and sync
+    // flows HTTP→soul, never the reverse — so session_start events for boots 5+
+    // silently vanished from the observable ISE stream (last visible: boot 4).
+    // ise_post falls back to a local tagged node if the HTTP Engram is down.
+    ise_post(payload)
     // Prune accumulated session-start events — keep the 10 most recent.
     // engram_search_json returns results in insertion order (oldest first), so
     // results[0..count-11] are the oldest; forgetting them leaves the newest 10.