Add generated diff categorization for Linguist and lockfiles

[mariusvniekerk]

Summary

• Add a generated auto-design category for diffs that are entirely generated, using linguist-generated Git attributes plus built-in generated artifacts like lockfiles.
• Thread generated-file detection through daemon auto-design dispatch so generated-only changes skip with an explicit generated reason instead of being treated as trivial or large diffs.
• Add unit and end-to-end coverage for Git attribute detection, generated-only classification, and auto-design behavior.

Testing

• go fmt ./...
• go vet ./...
• go test ./...
• git diff --check

[roborev-ci]

roborev: Combined Review (6bf78e0)

Summary verdict: Two medium-risk issues need attention; no critical or high findings were reported.

Medium

• internal/review/autotype/autotype.go:129
  The generated-only skip runs before trigger heuristics, so a commit where all files match GeneratedFiles can be skipped even when it also matches configured trigger_paths or trigger_message_patterns. That appears to contradict the existing precedence contract that explicit triggers force a design review.
  Fix: Move the generated-only skip after explicit trigger checks, or document the new precedence and add tests for generated files that also match trigger paths/messages.

• internal/git/git.go:279
git check-attr --source requires Git 2.43.0, but older common versions such as Git 2.34 on Ubuntu 22.04 do not support it. If linguistGeneratedFiles fails, GetGeneratedFiles returns nil, err, discarding any files already matched by built-in generated-file globs.
  Fix: Preserve and return partial built-in matches with the error, or gracefully ignore/fallback on the linguistGeneratedFiles failure so built-in detection still works on older Git versions.

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Synthesized from 3 reviews (agents: codex, gemini | types: default, security)

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 83.33333% with 14 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
internal/git/git.go	83.67%	4 Missing and 4 partials ⚠️
internal/daemon/ci_poller.go	83.33%	1 Missing and 1 partial ⚠️
internal/daemon/server_auto_design.go	81.81%	1 Missing and 1 partial ⚠️
internal/review/autotype/autotype.go	83.33%	1 Missing and 1 partial ⚠️

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[mariusvniekerk]

wrong repo.