Briefing Mode — Phase 2: passive ingest messaging + worktree_create/seed

[dotdevdotdev]

Second slice of Briefing Mode, per docs/wiki/research/briefing-mode-feasibility.md (§D, §C, §9 Phase 2). Builds on #433 (Phase 1 roles).

Goal

Ship the one genuinely new primitive — awareness without being driven — plus the plumbing to spawn+seed correspondents from one call.

Scope

• Passive ingest message kind (§D): never auto-delivered. Routes to a reserved ingest/ subdir the drain already skips (zero drain-logic changes — 'ls is the protocol'). Pulled voluntarily with agentwire msg pull / MCP msg_pull. msg inbox shows passive messages without consuming.
• MCP worktree_create + a --prompt seed flag on agentwire worktree (§C): spawn a worktree session and deliver the task in one call (reuses cmd_new's verified --first-message delivery). Completes the lifecycle quartet (create/status/list/remove). Also fixes cmd_worktree emitting double-JSON in --json mode.
• Role updates: correspondent drops a passive ingest pointer (not a driving msg); anchor msg pulls on the human's cue.

Out (Phase 3)

Unified say(text=, display=), markdown/links in the portal_notify toast, blessed dropbox resolver + typed ref field on Message.

Verification

Passive invariants (ingest excluded from drain + watchdog, pull consumes); CLI send/inbox/pull; MCP msg_pull + worktree_create register; worktree --prompt emits single JSON and delivers the seed (agent replied to a seeded prompt end-to-end).

[dotdevdotdev]

PR opened with Phase 2.

Breadcrumb (PR-open): Shipped the passive ingest primitive + worktree_create/seed.

• inbox.py: ingest kind routes to reserved ingest/ subdir → drain + watchdog skip it with no drain-logic changes; pull_ingest consumes. PASSIVE_KINDS/is_passive added.
• msg_cli.py/mcp_server.py: msg pull/msg_pull; inbox shows passive without consuming.
• mcp_server.py/__main__.py: worktree_create + worktree --prompt seed (verified delivery); fixed cmd_worktree double-JSON (cmd_new now sole emitter).
• Roles: correspondent → passive pointer; anchor → msg pull on cue.

Verified passive invariants, CLI/MCP surfaces, and a seeded correspondent replying end-to-end. Phase 3 (unified say(display=), toast markdown, dropbox resolver) remains. Agents need a session restart to see msg_pull/worktree_create.