fix(gateway): enforce task and mission ownership

docs/scratchpads/task-mission-ownership-20260313.md

@@ -0,0 +1,58 @@
+# Task Ownership Gap Fix Scratchpad
+
+## Metadata
+
+- Date: 2026-03-13
+- Worktree: `/home/jwoltje/src/mosaic-mono-v1-worktrees/fix-task-ownership`
+- Branch: `fix/task-mission-ownership`
+- Scope: Fix ownership checks in TasksController/MissionsController and extend gateway ownership tests
+- Related tracker: worker task only; `docs/TASKS.md` is orchestrator-owned and left unchanged
+- Budget assumption: no explicit token cap; keep scope limited to requested gateway permission fixes
+
+## Objective
+
+Close ownership gaps so task listing/creation and mission creation enforce project/mission ownership and reject cross-user access.
+
+## Acceptance Criteria
+
+1. TasksController `list()` enforces ownership for `projectId` and `missionId`, and does not return cross-user data when neither filter is provided.
+2. TasksController `create()` rejects unowned `projectId` and `missionId` references.
+3. MissionsController `create()` rejects unowned `projectId` references.
+4. Gateway ownership tests cover forbidden task creation and forbidden task listing by unowned project.
+
+## Plan
+
+1. Inspect current controller and ownership test patterns.
+2. Add failing permission tests first.
+3. Patch controller methods with existing ownership helpers.
+4. Run targeted gateway tests, then gateway typecheck/lint/full test.
+5. Perform independent review, record evidence, then complete the requested git/PR workflow.
+
+## TDD Notes
+
+- Required: yes. This is auth/permission logic and a bugfix.
+- Strategy: add failing tests in `resource-ownership.test.ts`, verify red, then implement minimal controller changes.
+
+## Verification Log
+
+- `pnpm --filter @mosaic/gateway test -- src/__tests__/resource-ownership.test.ts`
+  - Red: failed with 2 expected permission-path failures before controller changes.
+  - Green: passed after wiring ownership checks and adding owned-task filtering coverage.
+- `pnpm --filter @mosaic/gateway typecheck`
+  - Pass on 2026-03-13 after fixing parameter ordering and mission project nullability.
+- `pnpm --filter @mosaic/gateway lint`
+  - Pass on 2026-03-13.
+- `pnpm --filter @mosaic/gateway test`
+  - Pass on 2026-03-13 with 3 test files and 23 tests passing.
+- `pnpm format:check`
+  - Pass on 2026-03-13.
+
+## Review Log
+
+- Manual review: checked for auth regressions, cross-user list leakage, and dashboard behavior impact; kept unfiltered task list functional by filtering to owned projects/missions instead of returning an empty list.
+- Automated review: `~/.config/mosaic/tools/codex/codex-code-review.sh --uncommitted` running/re-run for independent review evidence.
+
+## Risks / Blockers
+
+- Repository-wide Mosaic instructions require merge/issue closure, but the user explicitly instructed PR-only and no merge; follow the user instruction.
+- `docs/TASKS.md` is orchestrator-owned and will not be edited from this worker task.