* fix(hooks): guard doc-file-warning stdin listeners behind require.main
doc-file-warning.js registered process.stdin data/end listeners at module
scope while also exporting run(). run-with-flags.js require()s any hook that
exports run() for its in-process fast path, so importing this hook attached
stray stdin listeners to the dispatcher process, corrupting the PreToolUse
stdout JSON contract. This is the exact failure run-with-flags' own SAFETY
comment warns about, and 24 sibling hooks already guard against it.
- Move the stdin entrypoint into main() and gate it behind require.main === module
- pre-write-doc-warn.js now calls main() explicitly instead of relying on the
import side effect
- Add regression tests: require() attaches no stdin listeners, run()/main()
stay exported, and the pre-write-doc-warn shim still warns
* docs(hooks): add JSDoc for doc-file-warning main() entrypoint
Satisfies the docstring-coverage pre-merge check; documents the stdin
entrypoint and why it must not run on require().
The inline JS in the Write PreToolUse hook had a multi-layer escaping
bug: the regex [\\/\\] collapsed to [\/\] after the validator's
unescape chain, producing an invalid regex (Unmatched ')').
Fix: move the doc-file-warning hook to scripts/hooks/pre-write-doc-warn.js,
eliminating the inline escaping problem entirely. All 992 tests now pass.
Closes the 991/992 CI failure on main.
