chore(blocking-io): fail-loud repo-root resolution and shared detector CLI shim (#3512)

* chore(blocking-io): fail-loud repo-root resolution and shared detector CLI shim

The three detectors resolved REPO_ROOT with depth-indexed
Path(__file__).resolve().parents[4]. If a detector file ever moves to a
different directory depth, scan roots resolve under the wrong directory
and the detector reports zero findings with no error — a silent-zero
failure shape for a detection tool.

- Add support/detectors/repo_root.py: resolve the repo root by walking
  upward to the .git marker (checked with exists() so git worktrees,
  where .git is a file, also resolve), raising RuntimeError when no
  marker is found. All three detectors use it at import time, so a
  relocated detector fails loudly instead of scanning an empty tree.
- Extract scripts/_detector_cli.py from the three character-identical
  CLI shims; the sys.path computation lives in one place and raises
  when backend/tests cannot be found.
- tests/test_detector_repo_root.py pins: resolution from an unmarked
  location raises instead of returning an empty scan; all three
  detectors share the resolved root; each CLI shim delegates to its
  detector.

Testing: backend `make test` (4278 passed); smoke-ran
`make detect-blocking-io`, `make detect-thread-boundaries`, and
`scripts/scan_changed_blocking_io.py --base upstream/main`.

Closes #3510 (review follow-up to #3503).

* chore(blocking-io): declare detector modules import-only, drop script-mode residue

Adversarial review caught that blocking_io_static.py and
thread_boundaries.py kept shebangs and __main__ blocks but can no longer
run as plain scripts: the new `from support.detectors.repo_root import`
executes before anything puts backend/tests on sys.path, so direct
invocation dies with ModuleNotFoundError before argparse.

Direct execution was never a documented entry point (Makefile targets,
the scripts/ shims, the blocking-io-guard skill, and tests all go
through the support.detectors package), so converge on import-only
instead of re-adding per-module bootstrap: drop the shebangs and the now
unreachable __main__ blocks (plus the `import sys` they kept alive) and
state the supported entry points in each module docstring. The shim
delegation tests in test_detector_repo_root.py pin the supported CLI
paths.

Testing: backend `make test` (4278 passed); `make detect-blocking-io`
and `make detect-thread-boundaries` smoke-ran.

backend/tests/support/detectors/blocking_io_changed.py

@@ -7,6 +7,9 @@ new versus the merge base — the latter catches exposure created without
 touching the blocking line itself (a new async caller making an old sync
 helper async-reachable). Used by the `blocking-io-guard` skill as the
 deterministic scope step.
+
+Not directly executable: import as `support.detectors.blocking_io_changed` or
+run via the CLI shim `scripts/scan_changed_blocking_io.py`.
 """
 
 from __future__ import annotations
@@ -15,14 +18,14 @@ import argparse
 import json
 import re
 import subprocess
-import sys
 from collections import defaultdict
 from collections.abc import Sequence
 from pathlib import Path
 
 from support.detectors import blocking_io_static as static
+from support.detectors.repo_root import resolve_repo_root
 
-REPO_ROOT = Path(__file__).resolve().parents[4]
+REPO_ROOT = resolve_repo_root(Path(__file__))
 SCAN_ROOTS = (
     "backend/app",
     "backend/packages/harness/deerflow",
@@ -207,7 +210,3 @@ def main(argv: Sequence[str] | None = None) -> int:
     else:
         print(format_report(findings, args.base))
     return 0
-
-
-if __name__ == "__main__":
-    sys.exit(main())