2aeb96c3f6
- Detect non-numeric prefixes (e.g., "LINE#HK", "POS#VK") and explain
that the prefix must be an actual line number, not literal text
- Add suggestLineForHash() that reverse-looks up a hash in file lines
to suggest the correct reference (e.g., Did you mean "1#HK"?)
- Unify error message format from "LINE#ID" to "{line_number}#{hash_id}"
matching the tool description convention
- Add 3 tests covering non-numeric prefix detection and hash suggestion