feat: multi-tenant auth with per-user workspace isolation (#1118)

* feat: multi-tenant auth with per-user scoping

Multi-user authentication and authorization for IronClaw gateway:
- Token-based auth mapping tokens to user IDs via GATEWAY_USER_TOKENS
- Per-user SSE broadcast scoping
- Per-user rate limiting with poisoned lock recovery
- Handler auth and ownership checks for jobs, settings, routines
- Extension secrets scoped per-user
- Chat handlers use authenticated identity
- Reverse proxy deployment documentation
- Comprehensive integration tests for auth, SSE, rate limiting, and job isolation

* fix: scope memory tools per-user in multi-tenant mode

Memory tools (search, write, read, tree) held a single workspace
created at startup with GATEWAY_USER_ID. In multi-tenant mode, all
users' tool calls searched the default user's scope.

Add WorkspaceResolver trait that resolves workspaces per-request using
JobContext.user_id. In single-user mode, returns the startup workspace.
In multi-tenant mode (GATEWAY_USER_TOKENS configured), creates and
caches per-user workspaces on demand.

Includes regression tests for workspace resolution and user isolation.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

* fix: comprehensive multi-tenant isolation audit

Address all review findings from @serrrfirat plus 7 additional gaps
found via full security audit:

Reviewer findings (5):
- WorkspacePool now applies search config, memory layers, embedding
  cache, identity read scopes, and global config scopes (was bare)
- jobs_summary_handler uses per-user queries instead of global counters
- jobs_prompt_handler restructured to not 404 agent jobs + ownership check
- jobs_restart_handler agent branch now verifies user ownership
- agent_job_summary_for_user added to Database trait + both backends

Audit findings (7):
- Delete dead handlers/memory.rs (stale copies with no auth)
- Add AuthenticatedUser to logs_events, logs_level_get, logs_level_set
- Add AuthenticatedUser to extensions_tools_handler, gateway_status_handler
- Add auth + ownership checks to all 6 routines handlers
- Add auth to all 4 skills handlers with audit logging on mutations
- Scope extension setup SSE broadcast to user (broadcast_for_user)
- Fix pre-existing test compilation errors in extensions/manager.rs

17 new multi-tenant isolation tests covering:
- WorkspacePool config propagation and scope merging
- Jobs handler per-user isolation (summary, restart, prompt, cancel)
- Routines handler auth enforcement and cross-user rejection
- Auth middleware enforcement on logs, skills, status endpoints

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

* fix: second-pass multi-tenant audit — scope SSE broadcasts, DB queries, dead handlers

Second audit pass applying learned patterns across the codebase:

- OAuth callback SSE broadcasts now use broadcast_for_user (lines 773, 912)
- jobs_list_handler uses list_agent_jobs_for_user instead of fetching
  all users' jobs and filtering in Rust
- list_agent_jobs_for_user added to Database trait + postgres + libsql
- Dead handler files (extensions.rs, static_files.rs) hardened with
  AuthenticatedUser to prevent auth regression if migrated

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

* fix: address review findings — token hashing, broadcast scoping, error handling

Security fixes:
- Hash tokens with SHA-256 at construction time so authentication
  compares fixed-size 32-byte digests, eliminating length-oracle
  timing leaks
- Scope auth SSE broadcasts per-user in chat_auth_token_handler —
  AuthRequired/AuthCompleted events were leaking across tenants
- Propagate DB errors in restart handlers instead of silently
  swallowing via `if let Ok(Some(...))` pattern

Code quality:
- Log SSE serialization failures instead of silently producing empty
  strings via unwrap_or_default()
- Remove dead `pub type AuthState = MultiAuthState` alias
- Replace `.unwrap()` with `Arc::clone(db)` in app.rs multi-tenant
  workspace setup (db is guaranteed Some in context, but unwrap
  violates project convention)
- Fix telegram setup test to inject UserIdentity into request
  extensions (handler now requires AuthenticatedUser)
- Add safety comments on test-only expect/unwrap calls for CI
- Apply cargo fmt to fix pre-existing formatting

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

* fix: address review findings — unify workspace pool, fix SSE regression, cache job owners

- Unify WorkspacePool and PerUserWorkspaceResolver: WorkspacePool now
  implements WorkspaceResolver, eliminating duplicate per-user workspace
  construction logic. app.rs uses WorkspacePool directly.

- Fix sse_tx: None scheduler regression: change scheduler/worker SSE
  broadcasting from broadcast::Sender<SseEvent> to Arc<SseManager>,
  restoring SSE event delivery for scheduled agent jobs.

- Cache job owner in orchestrator: add job_owner_cache to
  OrchestratorState so job_event_handler avoids a DB round-trip on
  every event after the first per job.

- Deduplicate ext_user_id computation in main.rs.

- Remove unused _gateway_state variable.

- Fix pre-existing test: first_token() returns None in multi-user mode
  by design; align test assertion.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

* style: fix formatting in app.rs

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

* refactor: extract memory handlers back into handlers/memory.rs

Move memory API handlers out of server.rs into their own module,
consistent with how jobs, routines, and skills handlers are organized.
The resolve_workspace() helper moves with them since it is only used
by memory handlers.

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <[email protected]>
Co-authored-by: [email protected] <[email protected]>

tests/module_init_integration.rs

@@ -216,7 +216,7 @@ async fn extension_manager_with_process_manager_constructs() {
     );
 
     // Verify the manager is functional — list returns Ok.
-    let result = manager.list(None, false).await;
+    let result = manager.list(None, false, "test").await;
     assert!(result.is_ok(), "list should succeed on empty manager");
     assert!(result.unwrap().is_empty());
 }