Retire channels/sessions/messages; A2A becomes primary agent comms (#306)

* feat(a2a): deliver latest incoming message preview into the claim briefing

list_unread_a2a now carries last_message_preview (the latest message from the
OTHER agent, never the agent's own reply), fetched via a correlated subquery in
the same query — no N+1 on the per-verb briefing path.

* feat(a2a): read_a2a verb delivers unread message bodies to the agent

A2AService.get_unread_messages returns the caller's unread INCOMING messages
(never its own sends), marking exactly those rows read atomically so a message
arriving mid-call is preserved. Wired as the read_a2a content verb (route +
do_server tool + granted to every delivery role) — the content-bearing read the
A2A inbox lacked (read_messages only zeroed the counter).

* docs(rag): document read_a2a as the A2A content-read path

* fix(task): backlog activation no longer requires a discussion session

Removes the SessionTaskTable gate in activate() (and its dangling log field),
deletes _inherit_parent_session + its create() call, and drops the now-unused
SessionTaskTable import. Coordination rides task state; the session subsystem is
being retired. Tests updated to the new (no-session) behavior.

* fix(orchestrator): drop session sweep from _run_sweep

Removes the messaging import + sweep_timed_out_sessions call. That import sat
outside the try/except, so once messaging.py is deleted it would have killed the
entire sweep cascade (budget kill-switch, token rollups, retention, image prune,
superseded-PR reconcile). Notification sweep + all maintenance sweeps unchanged.

* release-manager --no-tags read-clone fix

* test: update evidence_repo unit test for a2a last_message_preview

* refactor(gateway): drop session propagation on delegate

Removes propagate_sessions_to_subtask from delegate(), the ChoreographerDeps
messaging field + property, and the ChoreographerDeps messaging arg in deps.py
(ContentActions messaging + import stay until the verbs are removed). Deletes the
propagation test; strips the now-invalid messaging kwarg from ChoreographerDeps
test builders.

* refactor(gateway): remove say/open_session/link_session/channels verbs

Removes the four channel/session verbs across content_actions (impls +
ContentActionsDeps.messaging), do_server (tools + registry), role_config (grants
+ _CHANNEL_DISCOVERY), do.py (routes), schemas/v1/do.py (request models), and
deps.py (MessagingService import + construction). Regenerates the prompt verb
tables. dm/notify/read_messages/read_a2a stay. Tests deleted/updated accordingly.

* uv.lock Upgrade

* refactor: remove conversation RAG indexing; Secretary announces via notification

Drops the CONVERSATIONS index (index_conversation, ConversationsIndexPlugin,
IndexType.CONVERSATIONS enum, IndexConversationParams, mentor.py type-label, the
messaging index hook) and its chunk-table manifest entries. The Secretary's
ANNOUNCE/RELAY_MESSAGE now fan out a BROADCAST notification to every agent's
inbox (NotificationService.broadcast) instead of posting to a dead channel.

* fix(panel): label RAG health error lines by subsystem

A red llm_error (e.g. the glm-5.2:cloud weekly-limit 429) rendered under
the 'Embedding: ok' header with no label, reading as an embedding failure.
Prefix each error line with LLM / Embedding / Vector store.

* refactor: remove channel/message reads from metrics, dashboard, git, events

MetricsService drops get_communication_volume + the MessageTable
message-count in get_agent_metrics (and the now-dead messages_sent_week
field). DashboardService drops get_channel_feeds/_compute_channel_status
and the message read in get_recent_activity (task activity kept);
get_auditor_metrics no longer reports communication_volume.
GitService's two primary-session-id helpers always return None now
(callers already treat None as "no primary session"). events/handlers.py
drops the SESSION_CLOSED/SESSION_TIMEOUT subscriptions + the
handle_session_boundary handler.

Forced follow-on: api/routes/dashboard.py + api/schemas/dashboard.py
dropped the now-dangling live_feeds/ChannelFeed surface and the
/metrics/communication route, which wrapped the removed service calls
directly (mypy would otherwise fail on the missing attributes).

* refactor: delete MessagingService + channel seeding

Edited db/__init__.py and services/__init__.py first (drop the unconditional
Channel/Group/Message/Session table + MessagingService re-exports), then
deleted services/messaging.py, then trimmed db/seed.py to only create_agents
(create_channels/create_channel_memberships/create_initial_messages gone).

Forced expansion: api/routes/{channels,groups,sessions,messages}.py import
roboco.services.messaging directly (not through the package __init__), as
does api/routes/tasks.py (the session-links embed on GET /tasks/{id} and the
GET /{id}/sessions route). Deleting messaging.py without addressing these
breaks `import roboco.api.app` immediately, since app.py eagerly imports all
route modules at startup. Since the 4 CRUD route files are 100%
MessagingService-backed with zero independent logic (and are wholesale
deletes in the plan's later API-routes task anyway), deleted them now +
unmounted from app.py/routes/__init__.py; tasks.py got the same surgical
trim its later task already specified (drop session-links embed +
TaskSessionLinkResponse/TaskResponse.sessions). This pulls a slice of that
later work forward — the routes/schemas for channels/groups/sessions/messages
still need their own pass, but their messaging-coupled parts are gone.

Verified with a full-suite collection sweep (12010 tests collected, zero
import errors) beyond the directly touched test dirs, given the expanded
blast radius.

* refactor: remove channel/session/message models, tables, and channel policy

Models: deleted channel.py/group.py/session.py/messaging.py wholesale
(zero external consumers besides the models/__init__.py re-export).
message.py surgically trimmed: removed MessageCreate (dead) and MessageEdit
(never instantiated; ExtractedMessage.edit_history retyped to
list[dict[str, Any]] to match how it's actually persisted — confirmed
ExtractedMessage was never written to any DB table, so MessageTable's
removal carries no functional risk to the kept extraction pipeline).
base.py: removed SessionStatus + ChannelType, kept MessageType. Also
removed the confirmed-dead channels_read/channels_write fields from
models/agent.py:AgentPermissions and models/dashboard.py:ChannelFeedData.

db/tables.py: deleted ChannelTable/GroupTable/SessionTable/SessionTaskTable/
MessageTable, TaskTable.session_links, and JournalEntryTable.session_id —
cascaded through models/journal.py, services/journal.py, and
api/schemas+routes/journals.py (22 plumbing sites).

foundation/policy/communications.py: removed the ChannelSpec/CHANNELS
catalog + TEAM_SCOPED_ROLES/_CELL_*/_AUDITOR_ONLY helpers, kept the
notification policy (Priority/parse_priority/NOTIFY_SENDER_ROLES/
ACK_REQUIRED_BY_TYPE). enforcement/channel_access.py deleted (confirmed
fully dead in production). agents_config.py: removed CHANNEL_ACCESS
(kept A2A_ALLOWED_PAIRS). seeds/initial_data.py: removed
DEFAULT_CHANNELS/CHANNEL_MEMBERSHIPS/AUDITOR_SILENT_ACCESS + the
never-consumed INITIAL_MESSAGES. config.py: removed
session_idle_timeout_seconds (zero consumers). exceptions.py: removed
dead ChannelError/ChannelAccessDeniedError/SessionClosedError.

Forced expansion beyond the original file list — ChannelType cascaded
into a live, mounted surface the plan didn't trace: agents_config.
CHANNEL_ACCESS -> services/permissions.py's channel-RBAC methods (not
models/permissions.py, which turned out to have no channel code at all)
-> two real endpoints in api/routes/stream.py (GET /permissions,
GET /permissions/channel/{name}) and two dependency factories in
api/deps.py. Removed the channel methods + fields, deleted the
channel-specific stream.py endpoint, deleted require_channel_read/write.
Also deleted api/schemas/{channels,sessions}.py (hard dependency on the
removed enums; already fully dead after the Task 10 route deletions) and
api/schemas/messages.py (a TYPE_CHECKING-only import of the deleted
MessageTable; likewise already fully dead) + its dedicated test file.

Test updates: test_permissions.py -14 channel tests (matches the planned
count exactly), test_communications.py / test_communications_consumers.py
split to keep only notification-policy coverage, test_exceptions.py -9,
test_deps.py -4, plus the journal/stream/foundation-smoke fallout. Also
fixed a pre-existing (Task 7) broken assertion in
test_foundation_phase3_smoke.py that inspected a `say()` method already
removed from ContentActions.

Verified: full-suite collection (11961 tests, zero import errors) and a
complete test run (11567 passed, 394 skipped, 0 failed) in addition to
the targeted suites.

* migration: drop channels/groups/sessions/session_tasks/messages + enum types

alembic/versions/060_drop_messaging.py: drop_column journal_entries.
session_id (sidesteps hardcoding the FK constraint name — verified
empirically against a live migrated DB that it's actually
fk_journal_entries_session_id_sessions, but drop_column doesn't care
either way); drop_table in FK order (messages -> session_tasks ->
sessions -> groups -> channels); DROP TABLE IF EXISTS chunks_conversations
(runtime-provisioned, not alembic-managed, would otherwise orphan); DROP
TYPE IF EXISTS for messagetype/sessionstatus/sessionscope/channeltype
(messagetype's Python enum stays for ExtractedMessage, but the DB type
had zero live columns left once MessageTable was dropped in the prior
commit). downgrade() raises NotImplementedError — one-way removal.

Pruned scripts/reset_runtime_state.sql + .sh: removed the DELETE/COUNT
lines for messages/session_tasks/sessions/groups/channels and the
groups.active_session_id reset block.

Verified end-to-end against a scratch Postgres DB: full migration chain
001->060 applies cleanly, alembic heads shows a single head, all 6 dropped
tables + 4 enum types + the journal_entries.session_id column are
confirmed gone, journal_entries keeps only its journal_id/task_id FKs,
downgrade correctly raises NotImplementedError without corrupting DB
state, and the pruned reset_runtime_state.sql runs clean (no errors)
against a fully-migrated DB.

* refactor(api): remove channel/session/message routes + WS streams

Most of this task's file list was already forced through in earlier
commits (routes/{channels,groups,sessions,messages}.py + app.py/__init__.py
unmounting in the MessagingService-deletion commit; tasks.py's
session-links embed + GET /{id}/sessions + schemas/tasks.py's
TaskResponse.sessions in that same commit; deps.py's require_channel_read/
write + schemas/{channels,sessions}.py in the models/tables commit). This
closes out what was left:

- api/websocket.py: deleted the channel_stream + session_stream routes,
  ConnectionManager's channel_connections/session_connections dicts,
  connect_channel/connect_session, broadcast_to_channel/broadcast_to_session,
  get_channel_subscriber_count, and their cleanup lines in disconnect().
  Agent streams, notification streams, and the operator system stream are
  untouched.
- api/websocket_bridge.py: deleted _handle_session_event +
  _handle_message_event and their SESSION_CREATED/SESSION_CLOSED/
  SESSION_TIMEOUT/MESSAGE_SENT subscriptions. The A2A live-view, rate-limit,
  usage, agent-lifecycle, and notification bridges are untouched.
- api/schemas/websocket.py: removed NewMessageBroadcast, WSMessageNew,
  WSMessageEdit, WSMessageDelete, WSSessionClosed — kept the WSMessage base
  class (still subclassed by the kept WSAgentStream/WSNotification) plus
  those two.
- api/schemas/groups.py: deleted (already fully orphaned since routes/
  groups.py was removed; its GroupResponse/GroupDetailResponse had zero
  consumers).

Updated the 5 websocket test files accordingly (removed the channel/
session-specific tests + fixed imports); test_websocket_bridge.py's
registration-coverage test dropped the SESSION_*/MESSAGE_SENT assertions.

Verified: full-suite collection (11943 tests, zero import errors) and a
complete test run (11549 passed, 394 skipped, 0 failed).

* docs: retire channels/sessions/messages from agent-facing docs + CLAUDE.md

Rewrites docs/rag (RAG-indexed) + docs/map + CLAUDE.md to reflect A2A (dm +
read_a2a) as primary agent comms; deletes the channel docs, splits messaging-tools
+ messaging-notification (renamed notification.md), swaps the WS worked example to
A2A_MESSAGE_SENT. _complete_map.md still needs regeneration (generated file).

* refactor(panel): remove Communications surface (channels/sessions)

Deletes the /communications routes, message components, task-detail Sessions tab,
use-channels + channel/session WS hooks, and the channels/sessions/messages/groups
api clients; prunes the Channel/Session/Message/Group types + mock data. (Auditor
live-feeds + dashboard.ts dead-route cleanup is a follow-up.)

* refactor(panel): drop auditor channel-feed + dead communication-metric route

* docs(map): regenerate _complete_map from updated slices

* fix(a2a): reduce get_unread_messages complexity below xenon C + stale comments

Extract the per-conversation unread-counter recompute into _reset_unread_counter
(the CI quality gate flagged get_unread_messages as rank C). Also drop the deleted
open_session from a content_actions comment and reword an evidence_repo docstring
that cited the removed messaging._notify_mentions.

---------

Co-authored-by: Renn F <rennf93@users.noreply.github.com>

docs/map/foundation-lifecycle.md

@@ -1,5 +1,5 @@
 ## Purpose
-The canonical source of truth for RoboCo's task state machine, per-role action/verb permissions, claim rules, team-match rules, and self-review prevention. The spec module is pure data + lookups (no DB, no I/O); the enforcement package re-exports a backwards-compat view of the same tables plus the git-workflow gates, SLA keys, channel/A2A/journal/ownership access control. Import-time validators in _validate_lifecycle.py make a misconfigured spec fail fast at container start.
+The canonical source of truth for RoboCo's task state machine, per-role action/verb permissions, claim rules, team-match rules, and self-review prevention. The spec module is pure data + lookups (no DB, no I/O); the enforcement package re-exports a backwards-compat view of the same tables plus the git-workflow gates, SLA keys, A2A/journal/ownership access control. Import-time validators in _validate_lifecycle.py make a misconfigured spec fail fast at container start.
 
 ## Files
 
@@ -8,9 +8,8 @@ The canonical source of truth for RoboCo's task state machine, per-role action/v
 | /Users/renzof/Documents/GitHub/ZZZ/roboco-master/roboco/roboco/foundation/policy/lifecycle.py | Canonical lifecycle/permissions spec: Status, TaskType, Decision, Precondition, ActionSpec, IntentSpec, StatusTransition tables + can_invoke_action/intent lookups + CLAIM_RULES/ROLE_TEAM_RULES + PR_OPEN_STATES + UNMIGRATED debt set; import-time self-validates. | 1943 |
 | /Users/renzof/Documents/GitHub/ZZZ/roboco-master/roboco/roboco/foundation/_validate_lifecycle.py | Import-time validators (BFS reachability, terminal exits, intent composition chains, claim-rule coverage, self_review symmetry, slug/team agreement, Status/TaskStatus ORM parity, UNMIGRATED subset); LifecycleSpecError aborts container start on a bad spec. | 356 |
 | /Users/renzof/Documents/GitHub/ZZZ/roboco-master/roboco/roboco/enforcement/task_lifecycle.py | Backwards-compat shim over the spec: derives VALID_TRANSITIONS / ROLE_RESTRICTED_TRANSITIONS (merging _LEGACY_OPERATIONAL_EDGES + _LEGACY_ROLE_GATES), predicate helpers, SLA keys, GitContext + validate_git_requirements (doc-phase / CEO-escalation / claim-branch gates). | 441 |
-| /Users/renzof/Documents/GitHub/ZZZ/roboco-master/roboco/roboco/enforcement/__init__.py | Package re-export aggregator: exposes task_lifecycle, channel_access, a2a_access, journal_perms, task_ownership public symbols under one namespace. | 87 |
+| /Users/renzof/Documents/GitHub/ZZZ/roboco-master/roboco/roboco/enforcement/__init__.py | Package re-export aggregator: exposes task_lifecycle, a2a_access, journal_perms, task_ownership public symbols under one namespace. | 87 |
 | /Users/renzof/Documents/GitHub/ZZZ/roboco-master/roboco/roboco/enforcement/a2a_access.py | Agent-to-agent direct-message permission gate (delegates to roboco.agents_config.can_a2a_direct); A2AAccessDeniedError. | 91 |
-| /Users/renzof/Documents/GitHub/ZZZ/roboco-master/roboco/roboco/enforcement/channel_access.py | Channel read/write/silent-observer access gate over CHANNEL_ACCESS table; ChannelAccessDeniedError. | 109 |
 | /Users/renzof/Documents/GitHub/ZZZ/roboco-master/roboco/roboco/enforcement/journal_perms.py | Journal read permissions derived from foundation.policy.journaling ReadTier (ALL/ALL_CELLS/CELL_AND_PMS/CELL/OWN) + PROTECTED_JOURNALS; JournalAccessDeniedError. | 197 |
 | /Users/renzof/Documents/GitHub/ZZZ/roboco-master/roboco/roboco/enforcement/task_ownership.py | Task ownership + reassign + view + self-review guard (can_review_task); TaskOwnershipError. | 118 |
 
@@ -70,13 +69,12 @@ The canonical source of truth for RoboCo's task state machine, per-role action/v
 | _LEGACY_ROLE_GATES | dict | /Users/renzof/Documents/GitHub/ZZZ/roboco-master/roboco/roboco/enforcement/task_lifecycle.py:99 | Role pins for the legacy edges; UNION-merged with spec-derived ROLE_RESTRICTED_TRANSITIONS (overwrite once dropped pr_reviewer). |
 | _build_role_restricted_transitions | function | /Users/renzof/Documents/GitHub/ZZZ/roboco-master/roboco/roboco/enforcement/task_lifecycle.py:156 | Merges spec role_constraint pins with _LEGACY_ROLE_GATES via union (not overwrite). |
 | validate_a2a_access | function | /Users/renzof/Documents/GitHub/ZZZ/roboco-master/roboco/roboco/enforcement/a2a_access.py:38 | A2A direct-message gate (delegates to agents_config.can_a2a_direct). |
-| validate_channel_access | function | /Users/renzof/Documents/GitHub/ZZZ/roboco-master/roboco/roboco/enforcement/channel_access.py:36 | Channel read/write access gate with wildcard + silent-observer read. |
 | can_read_journal | function | /Users/renzof/Documents/GitHub/ZZZ/roboco-master/roboco/roboco/enforcement/journal_perms.py:121 | Journal read decision by ReadTier + protected-journal + same-cell/owner-is-pm rules. |
 | validate_task_ownership | function | /Users/renzof/Documents/GitHub/ZZZ/roboco-master/roboco/roboco/enforcement/task_ownership.py:35 | Ownership/reassign/view gate; non-PM must be the assignee. |
 | can_review_task | function | /Users/renzof/Documents/GitHub/ZZZ/roboco-master/roboco/roboco/enforcement/task_ownership.py:102 | Self-review prevention: agent_id != task_developed_by. |
 
 ## Data Flow
-Inputs: a (role, verb_or_action, task, Context) tuple. The Choreographer (services/gateway/choreographer/_impl.py + per-verb modules qa/pr_review/pr_gate) builds a Context (actor_id, plan, original_developer_slug, journal flags) per request, resolves the task row, and calls can_invoke_intent(role, verb, task, ctx). Control flow inside can_invoke_intent: verb lookup -> role gate -> _check_intent_preconditions (extra_preconditions, honoring per-precondition rejection_kind) -> if composes non-empty, can_invoke_action on the FIRST composed action only (subsequent actions chained by the runner after state transitions); if composes empty + verb in {claim_review, claim_doc_task, claim_gate_review}, _check_claim_rules_narrow; else allow. can_invoke_action order: action exists -> _check_role_status_type (role/source-status/task_type) -> _check_self_review_and_preconditions -> _check_claim_rules_narrow for claim. Output: a frozen Decision (allow / reject(kind,...) / tracing_gap(missing,remediate)) mapped by envelope.py onto the gateway Envelope (status/error/remediate/missing) and by valid_next_verbs onto the envelope's current_state introspection. Side-export: role_config.py calls intents_for_role at import to build per-role MCP tool manifests; GitService imports PR_OPEN_STATES to derive its HTTP PR-create str set; task_lifecycle shim derives VALID_TRANSITIONS/ROLE_RESTRICTED_TRANSITIONS consumed by TaskService._validate_and_set_status; validate_git_requirements consumed by TaskService transition path; enforcement.__init__ re-exports channel/a2a/journal/ownership gates consumed by messaging/journal services. At module load the spec calls run_all_lifecycle_validators() which BFS-validates the graph + compositions + claim/team tables, aborting container start on inconsistency.
+Inputs: a (role, verb_or_action, task, Context) tuple. The Choreographer (services/gateway/choreographer/_impl.py + per-verb modules qa/pr_review/pr_gate) builds a Context (actor_id, plan, original_developer_slug, journal flags) per request, resolves the task row, and calls can_invoke_intent(role, verb, task, ctx). Control flow inside can_invoke_intent: verb lookup -> role gate -> _check_intent_preconditions (extra_preconditions, honoring per-precondition rejection_kind) -> if composes non-empty, can_invoke_action on the FIRST composed action only (subsequent actions chained by the runner after state transitions); if composes empty + verb in {claim_review, claim_doc_task, claim_gate_review}, _check_claim_rules_narrow; else allow. can_invoke_action order: action exists -> _check_role_status_type (role/source-status/task_type) -> _check_self_review_and_preconditions -> _check_claim_rules_narrow for claim. Output: a frozen Decision (allow / reject(kind,...) / tracing_gap(missing,remediate)) mapped by envelope.py onto the gateway Envelope (status/error/remediate/missing) and by valid_next_verbs onto the envelope's current_state introspection. Side-export: role_config.py calls intents_for_role at import to build per-role MCP tool manifests; GitService imports PR_OPEN_STATES to derive its HTTP PR-create str set; task_lifecycle shim derives VALID_TRANSITIONS/ROLE_RESTRICTED_TRANSITIONS consumed by TaskService._validate_and_set_status; validate_git_requirements consumed by TaskService transition path; enforcement.__init__ re-exports a2a/journal/ownership gates consumed by journal services. At module load the spec calls run_all_lifecycle_validators() which BFS-validates the graph + compositions + claim/team tables, aborting container start on inconsistency.
 
 ## Mermaid
 ```mermaid
@@ -147,13 +145,12 @@ foundation-lifecycle
     │   ├── ROLE_STATE_SLA_KEYS / sla_seconds_for
     │   └── GitContext / GitRequirementError / validate_git_requirements / check_parallel_completion
     ├── a2a_access.py (A2A direct-message gate)
-    ├── channel_access.py (channel read/write/silent gate)
     ├── journal_perms.py (ReadTier-based journal read gate)
     └── task_ownership.py (ownership + reassign + self-review)
 ```
 
 ## Dependencies
-- Internal: roboco.foundation.identity (Role, Team), roboco.foundation.policy.journaling (ReadTier, ROLE_READ_TIERS, PROTECTED_JOURNALS), roboco.seeds.initial_data (AGENT_UUIDS, DEFAULT_AGENTS) for slug/team validators, roboco.agents_config (CHANNEL_ACCESS, can_a2a_direct, get_a2a_route_hint, get_agent_cell/role/team), roboco.config.settings (SLA key resolution), roboco.exceptions (RobocoError, TaskLifecycleError)
+- Internal: roboco.foundation.identity (Role, Team), roboco.foundation.policy.journaling (ReadTier, ROLE_READ_TIERS, PROTECTED_JOURNALS), roboco.seeds.initial_data (AGENT_UUIDS, DEFAULT_AGENTS) for slug/team validators, roboco.agents_config (can_a2a_direct, get_a2a_route_hint, get_agent_cell/role/team), roboco.config.settings (SLA key resolution), roboco.exceptions (RobocoError, TaskLifecycleError)
 - External: dataclasses (frozen dataclasses), enum.StrEnum, collections.deque (BFS validator), itertools.pairwise (intent chain validator), typing (Literal, TYPE_CHECKING, Callable, Any)
 
 ## Entry Points