DEVX-136: feat: add fix_pr_title module and update_pr API method

docs/user/cli-commands.md

@@ -339,28 +339,37 @@ devx tools check-test-speed --max-seconds 4 --max-single-seconds 0.5
 Statically analyze test files for un-hermetic patterns that cause slow
 or flaky tests. Also available as a **pytest plugin** (auto-discovered
 via the `pytest11` entry point when devx is installed — runs
-automatically on every `pytest` invocation).
+automatically on every `pytest` invocation and **fails on violations**).
 
-Detected patterns:
+Detected patterns (hard errors — exit non-zero):
 
 - **unpatched-subprocess**: `subprocess.run/call/Popen/check_call/check_output`
-  called in a test function without `@patch`
+  called in a test function without `@patch` or `with patch(...)`
 - **unpatched-sleep**: `time.sleep` called without `@patch`
 - **unpatched-helper**: known subprocess-spawning helpers (`update_doc_versions`,
   `run_cmd`, `run_tests`) called without `@patch` or patching their internal deps
 - **excessive-iterations**: `for _ in range(N)` where N > 100
+- **heavy-module-import**: `httpx`, `ansible`, etc. imported at module level
+- **reload-without-cleanup**: `importlib.reload()` called an odd number of times
+
+Advisory patterns (exit 0 — runtime audit is authoritative):
+
+- **transitive-subprocess**: `CliRunner.invoke(target)` where `target`
+  transitively calls `subprocess.run` without being patched. Detected via
+  static call-graph analysis. The runtime subprocess audit catches actual
+  leaks — if a real subprocess runs without `@patch`, the test fails.
 
 ```bash
 devx tools check-test-isolation
-devx tools check-test-isolation --test-path tests/ --strict
-devx tools check-test-isolation --categories unpatched-subprocess,unpatched-sleep
+devx tools check-test-isolation --test-path tests/
+devx tools check-test-isolation --categories unpatched-subprocess,transitive-subprocess
 devx tools check-test-isolation --max-loop-iterations 50
+devx tools check-test-isolation --src-dir src/
 ```
 
 Pytest plugin options (automatic when devx is installed):
 
-- `--strict-test-isolation` — fail the test run on violations
-- `--no-test-isolation` — disable analysis for this run
+- `--no-test-isolation` — disable static analysis and runtime subprocess audit
 - `--test-isolation-max-loop N` — max iterations per loop (default: 100)
 
 ### `devx tools configure-repo`