The suffix regex matched NO_REPLY at the end of any response,
suppressing substantive replies when models (e.g. Gemini 3 Pro)
appended NO_REPLY to real content.
Replace prefix+suffix regexes with a single whole-string match.
Only responses that are entirely the silent token (with optional
whitespace) are now suppressed.
Add unit tests for the fix.
Fixes#19537
* refactor: consolidate duplicate utility functions
- Add escapeRegExp to src/utils.ts and remove 10 local duplicates
- Rename bash-tools clampNumber to clampWithDefault (different signature)
- Centralize formatError calls to use formatErrorMessage from infra/errors.ts
- Re-export formatErrorMessage from cli/cli-utils.ts to preserve API
* refactor: consolidate remaining escapeRegExp duplicates
* refactor: consolidate sleep, stripAnsi, and clamp duplicates
