Removes 31 fully-orphaned source files with zero references anywhere in
the codebase, surfaced by knip static analysis and independently verified
(import-specifier grep across .ts/.tsx/.mjs/.cjs/.html/build configs,
transitive-cluster + basename-collision analysis).
Notable clusters:
- GitHub issue-comment composer + its close-reason dropdown/labels/popovers
(GitHubIssueCommentComposer and everything only it imported)
- Create-PR dialog components superseded by inline SourceControl logic
- right-sidebar Search/SearchHeader (unused search UI)
- two stale source-control-primary-* renderer duplicates (live logic moved
to src/shared/)
- CliAgentSkillSetup superseded by CliSection; its entry removed from the
AgentSkillSetupPanel governance test
Verified: typecheck (node/cli/web), oxlint, localization catalog+coverage,
full unit suite (24,581 tests), and electron-vite + web bundler builds all
pass with these files removed.
