docs+tests: fix CI after README slim (#875)

The regression-guard tests added in #835 were pinned to the old
README shape (tool table + file-reference table). When #897 slimmed
the README and moved that content to the website, three tests
started failing:

  TestReadmeToolsExistInCode.test_every_readme_tool_exists_in_tools_dict
  TestNoUnlistedTools.test_no_undocumented_tools
  TestReadmeDialectNotLossless.test_readme_dialect_line_not_lossless

Changes in this commit:

1. Update the 3 tests to track the new canonical docs surfaces
   - Tool list -> website/reference/mcp-tools.md
     (tests parse `### \`mempalace_xxx\`` headings instead of
     markdown table rows).
   - dialect.py lossless disclaimer -> website/reference/modules.md
     (any line mentioning dialect.py must not also say "lossless").

2. Fix the website to make "no undocumented tools" true
   Add the 10 tools that existed in TOOLS but were missing from
   website/reference/mcp-tools.md (create_tunnel, delete_tunnel,
   follow_tunnels, list_tunnels, get_drawer, list_drawers,
   update_drawer, hook_settings, memories_filed_away, reconnect).
   Page header now correctly says "all 29 MCP tools".

3. Align pre-commit ruff pin to match CI (0.4.x)
   .pre-commit-config.yaml was pinning ruff v0.9.0, while
   .github/workflows/ci.yml installs ruff>=0.4.0,<0.5. The two
   formatters produce incompatible output (e.g. v0.9.0 reformats
   `assert (x), msg` -> `assert x, (msg)` in a way v0.4.x rejects),
   which would cause the pre-commit hook to modify files that CI
   then flags as unformatted. Pinning the hook to v0.4.10 keeps
   the dev loop and CI in lock-step.

Full suite: 887 passed, 0 failed.

.pre-commit-config.yaml

@@ -1,6 +1,9 @@
 repos:
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.9.0
+    # Keep in lock-step with the ruff version pinned in .github/workflows/ci.yml
+    # (>=0.4.0,<0.5). Using a newer rev here produces a different formatter
+    # output than CI and breaks `ruff format --check` in the lint job.
+    rev: v0.4.10
     hooks:
       - id: ruff
         args: [--fix]