docs: update CHANGELOG with Phase 4 tenant isolation details

- Added Phase 4 RLS enforcement on all 31 remaining tables (#136)
- Documented BYPASSRLS session pattern and admin session factory
- Listed Phase 4 fixes for auth deps, background jobs, and seed scripts

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -11,6 +11,7 @@ All notable changes to ResolutionFlow are documented here.
 - **Tenant Isolation Phase 0** — multi-tenant data isolation (#132) with app-layer filtering helpers (`tenant_filter()`, `get_tenant_context`), cross-tenant access audit (analytics, categories, AI sessions, trees), UUID endpoint isolation with 404 responses for unauthorized access, ownership checks on all sensitive operations, and CI grep gate for missing tenant filters
 - **Tenant Isolation Phase 2** — PostgreSQL Row Level Security (RLS) on 11 session-related tables (ai_sessions, session_steps, session_tags, etc.), account_id NOT NULL enforcement on all write paths, Alembic migrations with dual-env support (Railway native vars + explicit DATABASE_URL_SYNC), RLS test coverage with cross-account isolation verification, migration CI/CD integration
 - **Tenant Isolation Phase 3** — RLS on audit_logs and tree_shares tables, cross-tenant session access for public shares (via get_admin_db), complete account_id propagation across PSA integration write paths, final RLS policy enforcement
+- **Tenant Isolation Phase 4** (#136) — RLS enforcement on all 31 remaining tables (users, trees, teams, integrations, scripts, categories, templates, surveys, etc.), BYPASSRLS session pattern for auth deps and background jobs, admin session factory for startup routines (service accounts, seed data), global table exclusions (platform_steps, template_trees, script_categories, accounts), RLS tests with complete cross-tenant isolation verification, proper tree_shares ownership checks using tree owner's account_id
 - **Script Library default view** — "All Scripts" tab now displays all accessible scripts (team + library)
 - **Session documentation overhaul** — reformatted PSA resolution/escalation notes with cleaner headers, inline engineer responses, decimal hour display (0.25 hrs), follow-up recommendations, and improved "What We Know" section from evidence items
 - **Client communication improvements** — new `request_info` audience type for client-facing information requests, improved status update and email draft prompts with per-context guidance
@@ -33,6 +34,7 @@ All notable changes to ResolutionFlow are documented here.
 - **Category tree counts** — cross-tenant row count leakage via tree_count field in GET `/categories/{id}`. Now scoped to requesting account.
 - **PSA retry ownership check** — retry-psa-push had no ownership validation (CRITICAL). Now validates user ownership before allowing retry.
 - **Task Lane save operation** — invalid task_lane_item UUIDs returned 403 revealing existence. Now returns 404 and uses query-level filtering.
+- **Phase 4 RLS enforcement** — fixed auth deps, user-mutation endpoints, background jobs, and lifespan routines to use BYPASSRLS sessions for reading/writing tenant-isolated tables; fixed seed scripts to use ADMIN_DATABASE_URL; bootstrap service account now initializes correctly with proper BYPASSRLS context
 - Dark text rendering on blue accent step-number badges across all flow types
 - Script Library tab ownership filter now preserved across category and search changes
 - Race conditions in script builder session creation and slug generation