feat(config): add review.auto_review.ignore_title_keywords eligibility knob

[JSONbored]

Add review.auto_review.ignore_title_keywords — a case-insensitive substring list (e.g. WIP, DRAFT) that skips AI review when the PR title matches. Deterministic; empty (default) ⇒ byte-identical. Third of the #1954 eligibility filters.

Deliverables

• Add ignoreTitleKeywords: string[] to the autoReview sub-object in src/signals/focus-manifest.ts, parsed as a bounded public-safe string list (reuse the list-parse discipline; cap like MAX_PATH_INSTRUCTIONS)
• Wire parse + reviewConfigToJson + present + EMPTY literals
• Entry-point evaluation: title contains any keyword (case-insensitive) ⇒ quiet 'review skipped (WIP title)' status, never a gate failure
• Unit tests: keyword match (mixed case), no-match, empty-list byte-identical, over-cap truncation warning; branch coverage on the match/no-match arms
• Document the knob in .gittensory.yml.example

References

• src/signals/focus-manifest.ts:653 (parseReviewConfig)
• src/signals/focus-manifest.ts:174 (MAX_PATH_INSTRUCTIONS cap pattern)
• .gittensory.yml.example
• part of #1954 / #1959 (epic #1953)

Part of #1954.

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size: S · gittensor:feature

[linear-code]

JSO-2157