profiles: retire gate flags and retrain prompts for the plan tool ...

- drop planning_enabled / planning_mandatory / planning_phase2_enabled /
  observe_skips_plan_enabled / adaptive_replan_enabled from AgentProfile,
  the loader and admin serialization
- add `plan` to native tools of developer, navi_code, tool_developer,
  secretary, server_admin, modeler_3d — without the gate they would
  otherwise lose planning entirely
- system prompts: call plan for non-trivial multi-step work before
  execution; complex plans get presented for confirmation; stuck or goal
  changed -> plan with a reason

Merge branch 'master' into feature/navi-code ...

# Conflicts:
#	navi/api/websocket.py
#	navi/config.py
#	navi/core/agent.py
#	navi/core/orchestrator.py
#	navi/main.py

security: critical batch 1 — RCE/XSS/CORS/webhook hardening ...

Backend:
- auth/deps: fix refresh-lock clock race (cleanup now monotonic like the cache)
- core/registry: add missing structlog logger (NameError on fallback path)
- config: GNAUTH_WEBHOOK_SECRET, NAVI_ALLOWED_ORIGINS (+list property)
- webhooks: HMAC-SHA256 signature verification (503 unconfigured in auth mode,
  unsigned+warning in no-auth mode, 403 bad/stale signature, 400 bad JSON)
- main: CORS from NAVI_ALLOWED_ORIGINS in auth mode (fail-fast on empty),
  eval router behind require_admin, /debug only registered in no-auth mode
- auth routes: mobile-done sid validation (32 hex) + CSP header + safe JS
  escaping (reflected XSS); Secure cookie flag via helper (https base URL)
- websocket: anonymous WS rejected in auth mode (closes legacy-session RCE);
  socket registered only after access checks; stop_session auth gate
- messages: REST agent start now takes session lock + busy flag (409 on
  active run), contextvars reset in finally

Webclient:
- useMarkdown: DOMPurify.sanitize on all rendered markdown (stored XSS),
  image-URL scheme whitelist, delegated error listener (no inline onerror)
- html.html artifact viewer: sandbox without allow-same-origin (opaque origin)
- tests: DOMPurify runs under jsdom (happy-dom Node.prototype.nodeName getter
  breaks DOMPurify); useWebSocket tests get localStorage stub + ui-kit alias

Tests: pytest 1049 passed, 1 skipped; vitest 61 passed

terminal: REST list/close endpoints + async client helpers (Etap 2) ...

The /terminals modal and the status-bar count need a server source for the
session's persistent terminals (background dev servers, etc.) and a way to
force-close one. Add REST endpoints over the existing TerminalManager:

- GET /sessions/{id}/terminals → terminal_manager.list(session_id) →
  {session_id, terminals: [summary,...]}. Access-checked (navi.sessions.read_all).
- POST /sessions/{id}/terminals/{name}/close → terminal_manager.close(...)
  → {session_id, terminal_name, closed: bool}. Name is URL-encoded by the
  client (terminal names may contain spaces).
- clients/terminal/api.py (async): list_terminals(session_id),
  close_terminal(session_id, name) — for the TUI modal + status-bar seed.

Tests: list empty / list returns active / close routes to manager / 404 on
unknown session (fake TerminalManager injected into the container, mirroring the
kv_store injection pattern). Full suite: 972 passed, 1 skipped.

Plan: docs/terminal_tool_plan.md — Etap 2 of 5.

Автономность мелких моделей: OUTPUT DISCIPLINE, milestone-todo, перехват финала хода ...

Два последовательных захода над одной проблемой — мелкие модели (12–30B) в navi_code
теряют автономность на трудных шагах: «остановился поболтать» вместо действия и
слишком большое расстояние между пунктами плана.

Заход 1 (З1–З3):
- З1: OUTPUT DISCIPLINE в системном промпте navi_code — «act, don't announce»,
  без few-shot антипримеров. Контракт хода: ответ без tool_calls = конец хода, поэтому
  объявление намерения текстом убивает автономность; правила заставляют вызывать
  инструмент в том же ходе.
- З2: плоский todo + метка группы milestone + декомпозиция. _parse_plan_steps
  возвращает list[tuple[milestone, text]]; milestone — метка группировки (не сущность,
  без статуса), «done» вычисляется при рендеринге; подшаги = больше плоских шагов
  (без вложенности). TUI side-panel группирует по milestone (плоский фолбэк при пустом
  milestone). Plan depth: max 15→20 + правило декомпозиции.
- З3: adaptive re-plan «длинный шаг» — nudge «разбей шаг» при in_progress ≥ порога
  итераций без смены todo (порог 4, раньше общего anti-stall warning на 8).

Заход 2 (шаги 1–3, после cloud-теста 31b vs 12b):
Корневая структурная причина: весь спасательный механизм (anti-stall warning с явным
предложением reflect, adaptive re-plan) живёт только внутри tool-цикла — nudge
инжектируется в pre_turn *следующей* итерации, которой при «остановился поболтать»
нет (ход закрылся по return до post_turn). 31b застревала через «продолжаю
tool-итерации» → дожала до warning → спаслась; 12b — через «замолчала текстом» → мимо
всех nudge.

- Шаг 1: перехват финала хода. Если модель выдала bare-text, но в todo есть открытые
  шаги (pending/in_progress) и лимит не исчерпан — НЕ эмитить StreamEnd, а сохранить
  ассистентский текст в session.context, поставить системный nudge и continue
  (без StreamEnd, без workers — консистентно с multi-iteration tool-турами). Счётчик
  final_interceptions на AgentTurnContext, лимит final_intercept_limit (default 2),
  эскалация жёсткости (мягкий → «second stop»). has_open_steps в todo.py: пустой
  todo → False (защита casual-сообщений), failed/skipped терминальны. Профильные
  флаги final_intercept_enabled/limit в base.py + loader + admin.
- Шаг 2: жёсткий reflect-триггер в промпте — «~3 tool attempts on the same step
  without progress → call reflect IN THIS TURN (tool call, not reasoning aloud)».
- Шаг 3: открыть replan для застревания — «call replan when reflect showed the whole
  approach is dead (not one failed step, but the approach itself)».

Тесты: 874 passed, 1 skipped. Новые — has_open_steps (5), final intercept (5),
milestone-группировка, adaptive long-step nudge, парсер шагов с milestone-маркером.

cloud: navi_code model → gemma4:31b-cloud для тестирования догадки (31b признала
застревание, 12b — нет); .env cloud-host уже gitignored.

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

Navi Code: force context compression via typed /compact control message ...

Forced /compact previously sent a chat message, which ran a full agent turn
that only produced summary text instead of running the real context compressor.
Worse, even when wired correctly, forced compact always reported "Nothing to
compact yet — the context is still small" regardless of context size: the typical
navi_code shape is a single long autonomous turn (1 user message + many tool
iterations = one turn), and partition_messages finds nothing to summarize when
turns <= keep_recent. The midturn auto-compress path already bypassed this via
keep_recent_messages (intra-turn split), but compact_stream passed
keep_recent_messages=None, so the fallback was disabled.

Changes:
- WS protocol: {"type":"compact"} control message (distinct from {"type":
  "message"}); rejected while an agent turn is active to avoid racing the agent.
- Agent.compact_stream: forced compression that bypasses the token threshold
  but still runs the real compressor; passes keep_recent_messages=max(12,
  context_keep_recent*2) so a single long turn compresses via intra-turn split
  (mirrors midturn auto-compress). Raises NothingToCompactError when context is
  genuinely too small.
- Orchestrator.run_compact + clear_run: broadcast agent events to subscribers,
  end with done marker, surface NothingToCompactError as an error event.
- Terminal client: ws_client.send accepts str|dict; CompactCommand enqueues
  {"type":"compact"}; TUI distinguishes forced compact (no stream_start) from
  in-turn auto-compress via the _streaming flag.
- Tests: compact_stream (incl. single-long-turn regression), WS handler
  dispatch/rejection, run_compact event/error broadcasting, ws_client send,
  compact command.

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

Isolate sub-agent todo + render live todo in TUI side panel ...

Phase 1 — sub-agent todo isolation (backend):
- Add current_todo_session_id ContextVar; subagent_runner scopes it to the
  sub-agent's ephemeral run id so its auto-populated plan and todo updates
  land in an isolated KV row instead of clobbering the parent session's todo
  (which the parent's goal-anchoring reads every iteration).
- todo._sid() and planning.set_tasks prefer current_todo_session_id; the
  parent run leaves it unset, so all existing todo consumers (anti-stall,
  goal anchor, get_progress_message) behave exactly as before.

Phase 2 — live todo in the TUI right column:
- TodoUpdated event + emit it from the agent loop after planning auto-populate
  and after each tool-execution turn.
- GET /sessions/{id}/todos reads the parent session's todo KV row (explicit
  user_id/session_id, optional injected kv).
- api.get_todos + TodoList/TodoPanel widgets: status-coloured markers
  (pending dim, in_progress accent+bold, done success, failed error, skipped
  dim), progress header, scrollable panel below the auto-height info block.
- Hybrid delivery: REST seeds the panel on attach/switch, todo_updated WS
  events update it live.

Sub-agent todos as nested sub-lists is deferred to a later phase.

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

agent: bounded autonomy — scope boundary + observe-vs-act ...

navi_code had unwanted "free flight": an observe request ("look at a
directory") triggered the full Phase 3 plan with milestones + auto-todo,
and goal_anchoring then drove the agent to finish those steps, climbing
into sibling projects and executing milestone docs it found.

Two toggleable, default-off profile flags (on for navi_code):

- scope_boundary_enabled: injects a standing system message keeping the
  agent within the literally requested scope; forbids acting on
  discovered TODO/roadmap/milestone docs (report only).
- observe_skips_plan_enabled: Phase 1 classifies MODE: observe|act; an
  observe request skips Phase 2/3 — no multi-step plan, no auto-todo, no
  "execute step by step" prompt. The agent just gathers info and answers.
  Independent of force_plan (observe on the first message still skips).

Free flight stays reproducible by flipping both flags off.

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

fix(ws): include session_id/profile_id in session_sync, guard renderer ...

The server sent {"type": "session_sync"} without session_id/profile_id,
crashing the terminal client (render.py did None[:8]). Add the fields to
both session_sync sends and guard the renderer against a missing id.

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

feat: integrate navi_ui MCP server (card_grid + form) into master ...

Port the internal navi_ui MCP server from the vmkdemo branch (it never
landed on master). The server exposes render_component, which returns a
structured JSON envelope; navi/mcp/tools.py extracts metadata.ui_component
onto the role="tool" message, and the webclient renders the component
(card_grid, form) inline inside the assistant turn.

Backend
- navi/mcp/ui_server/: FastMCP server + component registry with card_grid
  and form components (pydantic-validated payloads, LLM-friendly schema docs)
- mcp_servers.d/navi_ui.json: streamable_http config, group "ui"
- config.py: navi_ui_mcp_enabled/host/port flags
- main.py: start UI server in lifespan (task + wait-for-ready + cancel)
- mcp/tools.py: navi_ui envelope parsing; "Error:" results surface as
  failed tool calls so the UI card is not green
- orchestrator.py + agent.py: run_stream(hidden=) for form submissions
  (single is_display=False, is_context=True user message)
- api/websocket.py: extract _start_agent_run helper, add form_submit
  branch that delivers submitted form values as a hidden user message
- profiles/secretary: enable navi_ui "ui" group (agent + subagent)
- .env.example: NAVI_UI_MCP_* flags
- tests/unit/mcp/test_ui_server.py

Webclient
- components/ui/{registry.js,CardGrid.vue,Form.vue}: auto-discovered
  renderers (snake_case <-> PascalCase aliasing)
- components/messages/UiComponentCard.vue: wrapper rendered in
  AssistantMessage when entry.kind === 'ui_component'
- stores/chat.js: extract ui_component from tool_call metadata in both
  live stream and history-replay paths
- composables/useWebSocket.js: note that ui_component rides tool_call
- tests/unit/components/ui/* (17 tests)
- dist rebuilt

Excluded from the vmkdemo port: the stale single-file navi/mcp/ui_server.py
duplicate, the realtor profile, and the vmk_data server (unrelated real
estate work that was interleaved with navi_ui on vmkdemo).

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

Navi Code: stop via Esc + project cwd propagation ...

- TUI: Esc stops active stream cooperatively via POST /sessions/{id}/stop
- TUI: render stream_stopped as status message
- CLI/WebSocket: send shell cwd in client->server message field
- Orchestrator stores cwd in session.session_metadata
- ContextBuilder injects [Working directory] into LLM context
- Agent sets current_working_directory ContextVar per turn
- tools/base: ToolContext gains cwd field
- filesystem/terminal/code_exec resolve relative paths against session cwd
- Add bin/navi-code wrapper for PATH symlink; document in README.md
- Update docs/websocket.md and tests

Full pytest: 544 passed, 1 skipped.

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

Fix MCP names and profile API format consistency ...

- Replace stale mcp__navi_web__* / mcp__navi_3d__* names with canonical
  mcp__navi-web__* / mcp__navi-3d__* across prompts and key_tools.
- Update /agents/profiles and /admin/profiles endpoints to expose
  tools.agent / tools.subagent instead of deprecated enabled_tools fields.
- Update docs/mechanics.md to reference the new tools structure.
- Archive stale docs/visual.html.

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

Navi Code: Phase 1 — terminal-first profile, default profile mechanism, env/persona, tests ...

- Add navi_code profile (terminal-first coding assistant)
- Add NAVI_DEFAULT_PROFILE_ID setting and POST /sessions default profile fallback
- Add persona_navi_code.txt and .env.navi_code.example
- Add docs/plan_navi_code.md phased plan
- Update tests to verify default-profile selection in no-auth mode

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

Fix review issues for NAVI_AUTH_ENABLED feature ...

- Return 503 from /auth/login and /auth/callback when NAVI_AUTH_ENABLED=false
- Return model_copy() of _ANONYMOUS_USER to prevent accidental mutation
- Clean up __import__(datetime) in auth DDL
- Reorder FakeChatSession definition before use in tests
- Remove dead monkeypatch code in no-auth integration fixture
- Add unit test for get_current_user_ws in no-auth mode
- Add integration tests rejecting OAuth endpoints in no-auth mode

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

Add NAVI_AUTH_ENABLED switch for optional auth ...

- Add navi_auth_enabled setting (default true) to navi/config.py and .env.example
- When disabled, treat every request as anonymous admin user (id='anonymous')
- Create/update fixed anonymous navi_users row on startup
- Bypass OAuth/cookie/API-token resolution in navi/auth/deps.py
- Update /auth/status to return {enabled, configured}
- Log security warning on startup when auth is disabled
- Update webclient: skip fetchMe/login screen, show Local mode footer,
  expose /admin link, warn in API keys panel
- Rebuild webclient production bundle
- Add unit and integration tests for no-auth mode
- Update docs: auth.md, config.md, api.md, api_tokens.md, sessions.md,
  websocket.md, mechanics.md, index.md

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

Remove offline_access from OAuth scopes ...

gnexus-auth does not support offline_access yet (SUPPORTED scopes are
only openid, email, profile, roles, permissions). Requesting it caused
invalid_scope error and login failures.

Keep refresh token support as-is — tokens are still issued and
refreshed, just bound to the SSO session lifetime.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Fix OAuth callback to handle missing code and error responses ...

FastAPI validated code/state as required query params before the
handler body ran, so any OAuth error response (e.g. invalid_scope
from offline_access, user denied consent) produced an opaque 422
"Field required" instead of a readable error message.

- Make code, state, error, error_description all optional with defaults
- Detect OAuth error responses and return a clear 400 with the error
- Guard state[:8] slicing when state may be None

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Make shared files and published content publicly accessible ...

Remove auth requirements from:
- GET /sessions/{id}/files/{filename} — direct download links (session ID
  acts as unguessable capability token)
- GET /sessions/{id}/content — published inline content list

Both endpoints still verify session exists and protect against path
traversal. File upload and file listing remain auth-gated.

Update tests to match new signatures.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Fix frequent OAuth logouts: offline_access scope, transient error handling, fetchMe resilience ...

- Add 'offline_access' to OAuth scopes so gnexus-auth issues offline
  refresh tokens instead of SSO-session-bound ones.
- Distinguish TokenRefreshException (invalid/expired refresh token)
  from transient network errors during token refresh:
  * TokenRefreshException → logout (token genuinely dead)
  * Other exceptions → fallback to cached user or API token
- Improve refresh failure logging with exc_type and error message.
- Frontend fetchMe: swallow non-401 errors so transient 5xx/network
  failures don't flash the login screen.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Add persistent multi-session terminal tool with background support ...

- New TerminalManager module: named subprocess sessions per Navi session,
  background readers, event-sink streaming, idle auto-cleanup
- Refactor terminal tool to multi-action: run, open, close, list,
  status, send_input
- Add TerminalOutputDelta and TerminalClosed events for streaming
- Wire TerminalManager into AppContainer, orchestrator, and registry
- Persist session_metadata in Session model and pg_session_store
- Close all session terminals on session delete
- Webclient: handle terminal_output/terminal_closed WS events,
  display live terminal output in tool cards
- Update unit tests for new terminal actions

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Fix dead code in websocket.py — stream_start never sent on first message ...

websocket.py lines 301-308 were indented inside the `except` block after
`raise`, making them unreachable. This meant `stream_start` and
`_stream_to_client` never ran for the initial message send, so the client
saw no response until page reload (when the reconnect path took over).

Fix: dedent lines 301-308 so they execute after the try/except/finally
block on the normal success path.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Fix 19 issues found in full codebase review ...

Backend:
- Stop session auth bypass: require auth for owned sessions, reject anonymous with 401
- upload_file: stream chunks directly to disk instead of buffering in RAM
- MCP config: validate name against path traversal regex
- auth deps: cleanup stale refresh locks periodically
- auth routes: expire mobile auth states after 10 min to prevent unbounded growth
- compressor: meta-summarize existing summaries before compression; preserve assistant content when tool_calls present; rewrite hard_truncate to keep whole turns
- orchestrator: configurable WS replay buffer size; async cleanup/remove_websocket/clear_busy; fix run_recall ContextVar order to avoid deadlock on _build_agent failure; await cleanup in finally
- agent: persist image_msg in session.messages; remove archived messages from session after archive; remove duplicate StreamStopped yield on tool stop
- websocket: try/except around create_task with cleanup on failure; await remove_websocket

Frontend:
- App.vue: hashchange listener lifecycle in onMounted/onUnmounted
- MessageList.vue: passive scroll, flash timeout cleanup, archive scroll snapshot
- InputBar.vue: 300 ms debounce on draft save to localStorage
- SessionList.vue: remove :key from DynamicScroller to avoid remount jitter

Tests: 422 passed, 1 skipped

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Add archive message pagination, configurable WS replay buffer ...

Backend:
- Add archive_threshold to Session model and getSession response
- Add next_before_seq to archive endpoint for cursor pagination
- Make WS replay buffer size configurable via WS_REPLAY_BUFFER_SIZE

Webclient:
- Add getArchivedMessages API function
- Add archive pagination state and loadArchivedMessages to chat store
- MessageList: auto-load older messages on scroll-to-top with scroll
  position preservation and loading spinner

Docs: update config.md with new env vars

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Fix broken MCP admin endpoints after deps refactor ...

Replace stale `_mcp_manager` module-level import with `get_mcp_manager()`
calls in admin endpoints. The module-level variable was removed during the
AppContainer refactor, causing 500 errors on:
- POST /admin/mcp/{server}/reconnect
- GET /admin/mcp/status
- POST /admin/mcp/test

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Add client-side image resize and server-side image token budgeting ...

Client (useFileUpload.js):
- Resize images to max 1024px on longest side via Canvas before upload
- JPEG quality 0.9, preserves EXIF orientation
- Reduces typical phone photos from 8 MB → ~400-900 KB

Server (websocket.py):
- Increase limit to 8 images, 50 MB total payload

Server (agent.py):
- Before adding user message to session.context, estimate how many images
  fit in remaining context (500 tok/img, up to 80% of max_context_tokens)
- Images that don't fit are saved as resized JPEGs to session_files/
- References to saved images are appended to the user message text
  so Navi can view them later via image_view tool
- session.messages keeps ALL images for full UI history

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Fix MCP tool availability after health-check disconnect/reconnect ...

- connect() now calls _cleanup() first to avoid stale transport leaks.
- mark_disconnected() clears _session so _ensure_connected() knows
  the client truly needs a fresh session.
- register_mcp_tools() is no longer a no-op; it re-registers all
  connected MCP tools so reload_tools correctly restores them.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Apply review fixes to API token auth system ...

Backend:
- navi/auth/deps.py: replace 3 DB round-trips with single JOIN query for
  token resolution; update last_used_at still separate (best-effort)
- navi/api/routes/api_tokens.py: replace asyncpg-specific "UPDATE 1"
  string check with RETURNING id fetchrow; increase token_prefix from
  8 to 12 chars for better visual identification; add security notes
- tests/unit/auth/test_api_tokens.py: update tests for JOIN query and
  RETURNING-based revoke

Frontend:
- webclient/src/components/settings/ShowTokenModal.vue: new modal that
  shows the plain token in a readonly field with copy button and
  explicit warning — replaces the transient toast notification
- webclient/src/components/settings/ApiKeysPanel.vue: use ShowTokenModal
- webclient/src/composables/useWebSocket.js: add security comment about
  localStorage XSS risk and query param log exposure

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Add API token auth system for headless/micro clients ...

Backend:
- navi/auth/_ddl.py: add api_tokens table with boot-time migration
- navi/auth/deps.py: _resolve_user now falls back to X-Api-Token header
  and ?api_token query param for WebSocket auth
- navi/auth/__init__.py: add ApiToken pydantic model
- navi/api/routes/api_tokens.py: CRUD endpoints (POST/GET/DELETE)
- navi/main.py: wire api_tokens router

Frontend:
- webclient/src/App.vue: add #settings hash routing
- webclient/src/components/settings/: SettingsView, ApiKeysPanel,
  CreateKeyModal with copy-to-clipboard flow
- webclient/src/api/index.js: token CRUD API functions
- webclient/src/stores/apiTokens.js: Pinia store
- webclient/src/components/sidebar/AppSidebar.vue: settings link
- webclient/src/composables/useWebSocket.js: append ?api_token= when
  localStorage token is present

Tests:
- tests/unit/auth/test_api_tokens.py: 10 unit tests covering token
  resolution (header + query param), revoke, missing/revoked tokens,
  orphan users, and CRUD endpoints

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Fix recall race, ContextVar leaks, dead code, and recall duplication ...

- run_recall: wrap busy check + create_run in session_lock to prevent
  race between scheduler and websocket handler
- run_recall: save ContextVar tokens and reset in finally to avoid
  leaking user context into subsequent background tasks
- websocket.py: reset user ContextVars in finally after run completes
- orchestrator.py: remove dead set_notify / _notify abstraction
- orchestrator.py: extract _finalize_recall to deduplicate success /
  MaxIterationsReached / Exception finalization blocks

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Unify in-memory session state in AgentSessionOrchestrator ...

Replace scattered _runs + _busy_sessions + _session_sockets with a
single _sessions: dict[str, SessionState] on the orchestrator.

- SessionState dataclass holds run, busy_event, and websockets
- _session_sockets module-level global removed from websocket.py;
  socket tracking moved into orchestrator (add/remove_websocket)
- Event bus subscriber _on_recall_update moved into orchestrator
- Per-session asyncio.Lock added to protect concurrent-run guard
- _cleanup() auto-removes empty SessionState entries

Tests updated to reference _sessions instead of legacy _runs.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>