fix: permissions: PUT /api/permissions/roles/{id} with missing 'permissions' field silently wipes all role permissions

[antosubash]

Closes#269

Headless Pi worker

This is a draft pull request created from an issue carrying the approval label.
It is never merged automatically and requires human review.

Agent summary

Implementation

• Made RolePermissionsUpdate.permissions required.
• Missing permissions now returns HTTP 422 without changing assignments.
• Explicit {"permissions": []} remains a valid clear-all operation.
• Added API regression coverage for preservation and deliberate clearing.

Changed areas

• modules/permissions/permissions/contracts/schemas.py
• modules/permissions/tests/test_permissions_module.py

Verification

• uv run pytest modules/permissions/tests — 29 passed
• Ruff format/check — passed
• uv run ty check ... — passed
• git diff --check — passed

Visual evidence: none required.
Risks/blockers: none.

Local visual evidence

When requested, screenshots, traces, videos, and GIFs are stored only under the worker worktree's ignored
.qa/issues/269/ directory. GitHub CLI cannot attach those files; inspect them on the worker host
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View logs

[antosubash]

🔧 CI repair attempt 1 pushed. I will monitor the new checks automatically.

Root cause

The new regression test pushed test_permissions_module.py to 318 lines, violating the 300-line cap.

Changes

• Moved the regression test into:
  • modules/permissions/tests/test_permissions_role_update.py
• Reduced test_permissions_module.py to 287 lines.
• No production code or CI workflows changed.

Verification

• File-size check: passed.
• Permissions tests: 29 passed.
• make ci-python-lint: passed.
• make ci-python-typecheck: passed.
• make ci-js-lint: passed.
• make ci-js-typecheck: passed.
• make test-js: 103 passed.
• Full make test: 2045 passed, but 3 unrelated S3 tests failed with Moto returning HTTP 403 during bucket setup.

Remaining risk: full Python test suite remains blocked by the unrelated Moto/S3 environment failure.

[antosubash]

✅ CI checks passed after 1 automatic repair attempt.