chore(v1.0.1): opus review findings — docstring confirmation patterns, pyproject.urls, gitignore fix, logging

**Critical:**
- Add IMPORTANT confirmation lines to toggle_task and like_post docstrings
- Add [project.urls] section with Gitea repository link to pyproject.toml

**Medium:**
- Fix .gitignore: test_*.py recursive pattern (remove leading slash)
- Add exception logging to clear_list() for failed deletions
- Update get_categories() docstring: clarify custom vs system category locale behavior
- Add Versioning Policy section to CHANGELOG.md

**Minor:**
- Fix CLI help text (remove "(read-only)" qualifier)
- Add language note to CLAUDE.md (German file, English code)
- Create tests/README.md with integration test documentation
- Update version to 1.0.1 in pyproject.toml

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

tests/README.md

@@ -0,0 +1,39 @@
+# Tests
+
+Integration tests for mcp-familywall.
+
+## Prerequisites
+
+Tests require valid Family Wall credentials to run against the live API.
+Credentials are loaded from:
+
+1. **OS Keyring** (recommended) — set via `mcp-familywall setup`
+2. **Environment variables** — `FW_EMAIL` and `FW_PASSWORD`
+
+## Running Tests
+
+```bash
+uv run pytest tests/
+```
+
+For verbose output:
+
+```bash
+uv run pytest tests/ -v
+```
+
+## Test Coverage
+
+- Circles management (create, list, update, delete, members)
+- Lists and tasks (CRUD operations)
+- Categories (system and custom)
+- Recipes and meal planning
+- Activity feed and reactions
+- Date validation and error handling
+
+## Notes
+
+- Tests create temporary circles, lists, and tasks for verification
+- All test objects are cleaned up after execution
+- Do not run tests against production data — use test credentials only
+- Some tests are marked as skipped if premium features are unavailable