chore: configure ruff + eslint linters for agentic workflow

- Replace pylint with ruff (backend/ruff.toml)
  - line-length=300, max-complexity=10, per-file-ignores for tests
  - Exclude D (docstrings replaced by contracts) and ANN
- Add eslint flat config for frontend (eslint-plugin-svelte)
  - Allow console.info/warn/error (belief-state protocol)
- Remove .pylintrc (references non-existent plugin)
- Update agent docs: ruff check . + npm run lint
- Add ruff>=0.11.0 to backend/requirements.txt
- Add eslint + plugins to frontend devDependencies

.opencode/agents/fullstack-coder.md

@@ -62,7 +62,8 @@ You own:
 # Backend
 cd backend && source .venv/bin/activate
 python -m pytest -v
-python -m ruff check src/ tests/
+python -m ruff check .
+npm run lint  # from frontend/
 
 # Frontend
 cd frontend

.opencode/agents/python-coder.md

@@ -71,7 +71,7 @@ cd backend && source .venv/bin/activate && python -m pytest -v
 python -m pytest --cov=src --cov-report=term-missing
 
 # Ruff linting
-python -m ruff check src/ tests/
+python -m ruff check .
 
 # Specific test file
 python -m pytest tests/test_auth.py -v

.opencode/agents/qa-tester.md

@@ -47,7 +47,8 @@ For each production contract, verify:
 ## Execution
 - **Python tests:** `cd backend && source .venv/bin/activate && python -m pytest -v`
 - **Python coverage:** `python -m pytest --cov=src --cov-report=term-missing`
-- **Python lint:** `python -m ruff check src/ tests/`
+- **Python lint:** `python -m ruff check .`
+- **Frontend lint:** `cd frontend && npm run lint`
 - **Svelte tests:** `cd frontend && npm run test`
 - **Svelte build check:** `cd frontend && npm run build`
 

.opencode/agents/speckit.md

@@ -96,7 +96,8 @@ You are Kilo Code, acting as a Speckit Workflow Specialist. MANDATORY USE `skill
 6. After each phase, run verification:
    - Backend: `cd backend && source .venv/bin/activate && python -m pytest -v`
    - Frontend: `cd frontend && npm run test`
-   - Lint: `python -m ruff check` (backend)
+    - Lint: `python -m ruff check .` (backend)
+    - Frontend lint: `cd frontend && npm run lint`
 7. If a phase fails verification, stop and fix before proceeding.
 8. Never bypass semantic debt to make code appear working.
 9. Never strip `@RATIONALE` or `@REJECTED` to silence semantic debt.