2.1.1 — MCP Phase 0: every high-level op returns an envelope (return-not-print)

Internal refactor per docs/MCP-SERVER-SPEC.md §4; CLI output and exit codes
unchanged (wrappers reproduce them from the envelopes):

- echo_ops: capture_op/resolve_op/link_op — duplicate gate and offline queueing
  are data (action: duplicate-gate + candidates; queued: true); the --json
  stdout-swallow hack is deleted (helper chatter -> stderr inside the cores);
  capture_op takes body_text= directly (the MCP path, no temp file).
- echo_recall.recall_op — one structured result backs prose and --json.
- echo_triage.list_op/route_op, echo_reflect.apply_op,
  echo_session.session_end_op — call capture_op internally, count gate outcomes
  from envelopes.
- echo.scope_show_op/scope_set_op/load_op (+ shared _load_gather), and
  echo_doctor.run_op (checks as data).

New eval/test_ops_api.py asserts the contract for every core: envelope shape
AND stdout purity (a stray print would corrupt an MCP response stream). All six
suites green. The 2.2 server build now starts directly at the app layer.

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

echo-memory.plugin.src/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "echo-memory",
-  "version": "2.1.0",
+  "version": "2.1.1",
   "homepage": "https://git.alwisp.com/jason/echo",
   "repository": "https://git.alwisp.com/jason/echo",
   "description": "Persistent memory via the ECHO Obsidian vault over the Obsidian Local REST API. Cross-platform Python client: one-call capture/resolve/recall/link/triage over an entity index, hybrid BM25 + graph recall spanning entities + sessions/journal (recency/status-aware), a pre-write duplicate gate, complete-frontmatter capture, session hooks that self-fire load/reflect, offline write-ahead queue, lock-guarded concurrency, linter-enforced routing, and /echo-* commands.",