feat(server): infer commit and PR title style from repo history

[binbandit]

Summary

• infer commit message style from recent repository commit subjects instead of hard-coding conventions
• infer pull request title style from recent repository pull request titles when available, with recent commits as fallback context
• default generated commit and pull request titles to Conventional Commits when the repository has no usable history

Testing

• bun fmt
• bun lint
• bun typecheck
• bun run --cwd apps/server test src/git/Layers/CodexTextGeneration.test.ts src/git/Layers/GitCore.test.ts src/git/Layers/GitHubCli.test.ts src/git/Layers/GitManager.test.ts

Note

Infer commit and PR title style from repo history in text generation prompts

• Adds readRecentCommitSubjects to GitCoreShape and listRecentPullRequestTitles to GitHubCliShape, backed by git log and gh pr list respectively.
• generateCommitMessage and generatePrContent in CodexTextGenerationLive now fetch recent commit subjects and PR titles concurrently and inject style guidance into Codex prompts.
• When no repo examples exist, prompts default to Conventional Commits guidance; when examples are found, they are deduped, trimmed, and limited before inclusion.
• Errors during example retrieval are swallowed and return empty lists, so generation continues without style guidance rather than failing.
• Behavioral Change: generated commit subjects and PR titles may change in format now that repo-specific style examples influence prompts.

^{Macroscope summarized cfd99f8.}

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[UtkarshUsername]

I think it should be fork-aware, and check the titles of PRs made to the original repo

[UtkarshUsername]

listRecentPullRequestTitles() uses gh pr list against the current checkout repo, right? So in a fork clone it gets PR titles from the fork, not the upstream repo

[binbandit]

I think it should be fork-aware, and check the titles of PRs made to the original repo

I agree, but there is a different PR for that. Ill do it as part of that