feat(cli+docs+smoke): inference-task CLI + GC ticker + smoke + docs (v5 Stage 4)

CLI surface for the durable queue:

- `mcpctl get tasks` — table view (ID, STATUS, POOL, LLM, MODEL,
  STREAM, AGE, WORKER). Aliases `task`, `tasks`, `inference-task`,
  `inference-tasks` all normalize to the canonical plural so URL
  construction works uniformly. RESOURCE_ALIASES + completions
  generator updated.
- `mcpctl chat-llm <name> --async -m <msg>` — enqueue and exit. stdout
  is just the task id (pipeable into `xargs mcpctl get task`); stderr
  carries human-readable status. REPL mode is rejected for --async
  (fire-and-forget doesn't make sense without -m).

GC ticker in mcpd: 5-min interval. Pending tasks past 1 h queue
timeout flip to error with a clear message; terminal tasks past 7 d
retention get deleted. Both queries are index-backed.

Crash fix uncovered by the smoke: when the async route doesn't await
ref.done, a later cancel/error rejected the in-flight Promise as
unhandled and crashed mcpd. The route now attaches a no-op `.catch`
so the legacy `done` semantic still works for sync callers (chat,
direct infer) without taking out the process for async ones. The
EnqueueInferOptions also gained an explicit `ownerId` field so the
async API can stamp the authenticated user on the row instead of
inheriting 'system' from the constructor's resolveOwner — without
this, every GET/DELETE from the original caller would 404 due to
foreign-owner mismatch.

Smoke (tests/smoke/inference-task.smoke.test.ts):

  1. POST /inference-tasks while no worker bound → row=pending.
  2. Bring a registrar online → bindSession drain claims and
     dispatches → worker complete()s → row=completed → GET returns
     the assistant body.
  3. Stop worker, enqueue, DELETE → row=cancelled, persisted.

docs/inference-tasks.md (new): full data model, lifecycle diagram,
async API reference, CLI examples, RBAC table, GC defaults, and the
v5 limitations / v6 roadmap. Cross-linked from virtual-llms.md and
agents.md.

Tests + smoke: mcpd 893/893, mcplocal 723/723, cli 437/437, full
smoke 146/146 (was 144, +2 new task smoke). Live mcpd verified via
manual curl: enqueue → cancel → re-fetch — no crash, owner scoping
returns 404 on foreign ids, GC ticker logs at info when it sweeps.

v5 complete: durable queue (Stage 1) + VirtualLlmService rewire
(Stage 2) + async API & RBAC (Stage 3) + CLI/GC/smoke/docs (Stage 4).

scripts/generate-completions.ts

@@ -186,7 +186,7 @@ async function extractTree(): Promise<CmdInfo> {
 const CANONICAL_RESOURCES = [
   'servers', 'instances', 'secrets', 'secretbackends', 'llms', 'agents', 'personalities', 'templates', 'projects',
   'users', 'groups', 'rbac', 'prompts', 'promptrequests',
-  'serverattachments', 'proxymodels', 'all',
+  'serverattachments', 'proxymodels', 'inference-tasks', 'all',
 ];
 
 const ALIAS_ENTRIES: [string, string][] = [
@@ -206,6 +206,10 @@ const ALIAS_ENTRIES: [string, string][] = [
   ['promptrequest', 'promptrequests'], ['promptrequests', 'promptrequests'], ['pr', 'promptrequests'],
   ['serverattachment', 'serverattachments'], ['serverattachments', 'serverattachments'], ['sa', 'serverattachments'],
   ['proxymodel', 'proxymodels'], ['proxymodels', 'proxymodels'], ['pm', 'proxymodels'],
+  // v5: inference-task queue. Short forms (`task`, `tasks`) are what
+  // operators actually type — `mcpctl get tasks`.
+  ['task', 'inference-tasks'], ['tasks', 'inference-tasks'],
+  ['inference-task', 'inference-tasks'], ['inference-tasks', 'inference-tasks'],
   ['all', 'all'],
 ];