feat: Add errands persistence layer — repository port, Drizzle adapter, migration, and tests

- Add errand-repository.ts port with ErrandRepository, ErrandWithAlias, ErrandStatus types
- Add DrizzleErrandRepository adapter with create, findById (left-joins agents for alias),
  findAll (optional projectId/status filters, desc by createdAt), update, delete
- Wire exports into repositories/index.ts and repositories/drizzle/index.ts
- Add migration 0035_faulty_human_fly.sql (CREATE TABLE errands) and drizzle snapshot
- Add 13 tests covering CRUD, filtering, ordering, agentAlias join, cascade/set-null FK behaviour
- Update docs/database.md to document the errands table and ErrandRepository

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/database.md

@@ -5,8 +5,8 @@
 ## Architecture
 
 - **Schema**: `apps/server/db/schema.ts` — all tables, columns, relations
-- **Ports** (interfaces): `apps/server/db/repositories/*.ts` — 13 repository interfaces
-- **Adapters** (implementations): `apps/server/db/repositories/drizzle/*.ts` — 13 Drizzle adapters
+- **Ports** (interfaces): `apps/server/db/repositories/*.ts` — 14 repository interfaces
+- **Adapters** (implementations): `apps/server/db/repositories/drizzle/*.ts` — 14 Drizzle adapters
 - **Barrel exports**: `apps/server/db/index.ts` re-exports everything
 
 All adapters use nanoid() for IDs, auto-manage timestamps, and use Drizzle's `.returning()` for atomic reads after writes.
@@ -196,6 +196,21 @@ Messages within a chat session.
 
 Index: `(chatSessionId)`.
 
+### errands
+
+Tracks errand work items linked to a project branch, optionally assigned to an agent.
+
+| Column | Type | Notes |
+|--------|------|-------|
+| id | text PK | caller-supplied |
+| description | text NOT NULL | human-readable description |
+| branch | text NOT NULL | working branch name |
+| baseBranch | text NOT NULL | default 'main' |
+| agentId | text FK → agents (set null) | assigned agent; null if unassigned |
+| projectId | text FK → projects (cascade) | owning project |
+| status | text enum | active, pending_review, conflict, merged, abandoned; default 'active' |
+| createdAt, updatedAt | integer/timestamp | |
+
 ### review_comments
 
 Inline review comments on phase diffs, persisted across page reloads.
@@ -216,7 +231,7 @@ Index: `(phaseId)`.
 
 ## Repository Interfaces
 
-13 repositories, each with standard CRUD plus domain-specific methods:
+14 repositories, each with standard CRUD plus domain-specific methods:
 
 | Repository | Key Methods |
 |-----------|-------------|
@@ -233,6 +248,7 @@ Index: `(phaseId)`.
 | ConversationRepository | create, findById, findPendingForAgent, answer |
 | ChatSessionRepository | createSession, findActiveSession, findActiveSessionByAgentId, updateSession, createMessage, findMessagesBySessionId |
 | ReviewCommentRepository | create, findByPhaseId, resolve, unresolve, delete |
+| ErrandRepository | create, findById, findAll (filter by projectId/status), update, delete |
 
 ## Migrations
 
@@ -244,4 +260,4 @@ Key rules:
 - See [database-migrations.md](database-migrations.md) for full workflow
 - Snapshots stale after 0008; migrations 0008+ are hand-written
 
-Current migrations: 0000 through 0030 (31 total).
+Current migrations: 0000 through 0035 (36 total).