- Add _try_rerank() to job_ranker.py: after stack_score sort, rerank
top-50 candidates by (resume_text, description) cross-encoder relevance
- Add resume_text param to rank_jobs(); graceful no-op when empty
- Add reranker gap-reordering pass in rewrite_for_ats(): gaps sorted by
(jd_text, term) relevance before section grouping and LLM rewrite
- Both integrations fall back silently on ImportError or inference failure
- 13 new tests; CF_RERANKER_MOCK=1 for zero-weight test runs
- Closes#108
LLMs occasionally emit backslash sequences that are valid regex but not valid
JSON (e.g. \s, \d, \p). This caused extract_jd_signals() to fall through to
the exception handler, leaving llm_signals empty. With no LLM signals, the
optimizer fell back to TF-IDF only — which is more conservative and can
legitimately return zero gaps, making the UI appear to say the resume is fine.
Fix: strip bare backslashes not followed by a recognised JSON escape character
(" \ / b f n r t u) before parsing. Preserves \n, \", etc.
Reproduces: cover letter generation concurrent with gap analysis raises the
probability of a slightly malformed LLM response due to model load.
