2.1.0 — quick-wins train: brief load, offline-durable capture, session-end verb

Three independently useful changes (IMPROVEMENT-PLANS #1/#3/#7), no schema changes:

- load --brief: token-budgeted cold-start digest (facts full, last-10 observations,
  scope+freshness, last session's key sections, agent-log lines, inbox count;
  ECHO_LOAD_BUDGET ~8000 chars, lowest-priority-first trimming). SessionStart hook
  injects the brief form; /echo-load keeps the full dump. All load reads (+ the
  sessions listing, which also feeds the heartbeat fallback) fetched in parallel.
- Offline capture durability: a fully-offline capture queues the WHOLE op as one
  semantic record; flush replays it through capture so routing/gate/aliasing re-run
  against the current index; a gate stop on replay is kept + flagged
  (needs_attention, surfaced by flush and load), never landed blind; update-path
  and ensure_daily_log writes ride safe_request; same-args captures dedupe.
- session-end: one call, one lock — session log -> agent-log line -> reflect
  proposals (gate-aware) -> optional scope set -> heartbeat LAST as the commit
  marker; dry-run default; ECHO_NOW pins HHMM; validation runs before any write.
  Stop hook nudge names the command and recognizes it as reflected.
- Fix: main() now catches the __main__ twin-module EchoError (via RuntimeError +
  .code) so helper-module errors exit with their intended codes, not tracebacks.

+19 e2e checks; all suites green. Plans renumbered: MCP container is 2.2.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

echo-memory.plugin.src/skills/echo-memory/scripts/echo_hook_stop.py

@@ -30,9 +30,11 @@ MIN_TURNS = int(os.environ.get("ECHO_REFLECT_MIN_TURNS", "5"))
 REASON = (
     "[echo-memory] Session-end reflection has not run yet. If this session produced "
     "durable facts, decisions, commitments, or artifacts worth remembering: run the "
-    "/echo-reflect flow (extract -> preview -> apply only with the operator's confirm) "
-    "and write the session log + heartbeat per the echo-memory skill. If nothing "
-    "durable emerged, simply finish — do not invent memories. "
+    "/echo-reflect flow (extract -> preview -> apply only with the operator's confirm), "
+    "then finish with ONE call — `echo.py session-end <bundle.json> --apply` — which "
+    "writes the session log, Agent Log line, reflect proposals, optional scope switch, "
+    "and the heartbeat (last, as the commit marker) together. If nothing durable "
+    "emerged, simply finish — do not invent memories. "
     "(This reminder fires once per session.)"
 )
 
@@ -64,6 +66,7 @@ def already_reflected(raw: str) -> bool:
     """Transcript evidence that reflection or session logging already happened."""
     return ("/echo-reflect" in raw
             or re.search(r'echo\.py"?\s+reflect\b', raw) is not None
+            or re.search(r'echo\.py"?\s+session-end\b', raw) is not None
             or "put _agent/sessions/" in raw
             or "put _agent/heartbeat/last-session.md" in raw)