fix(rebrand): full-cutover rename remaining internal gittensory runtime identifiers

[JSONbored]

Summary

• Rebrand epic Epic: complete the gittensory -> loopover rebrand (full cutover, no dual-support) #5705, Phase 8a: renames functional runtime identifiers that survived Phases 1-7 because they weren't caught by prior sed/perl sweeps — bare positional-argument audit-actor strings, Sentry allowed-context/fingerprint/monitor-slug names, OTel default service name + span attributes, HKDF/hash namespace strings, the miner's worktree branch-prefix/subdir constants, and the browser-extension message-passing protocol strings + CSS class names.
• Fixes a real regression: apps/loopover-extension/content.js's duplicate-mount guard was querying the pre-Phase-6 attribute name after the setter was renamed, silently disabling the guard.
• Fixes stale generated doc drift in packages/loopover-miner/docs/env-reference.md (title never regenerated after Phase 5 fixed the generator).
• Finishes an incomplete earlier rename: apps/loopover-ui's /docs/gittensory-commands route (file + URL + footer/nav links) was left stale even though the @gittensory → @loopover mention-command docs it covers were already renamed in Phase 2 — every bot comment footer was linking to a URL that no longer matched the feature name.

Deliberately not touched (confirmed permanent/deferred):

• The real, unrenamed JSONbored/gittensory GitHub repo and Sentry-project references
• GITTENSORY_LEGACY_* check-run constants
• The already-decided gittensory-selfhost container-image legacy alias
• PUBLIC_SITE_ORIGIN_ALIASES domain alias
• .gittensory-miner.yml per-repo config filename — a large (37-file), distinct surface, deferred to its own follow-up PR

Test plan

• npm run typecheck clean
• npx vitest run — 837 files / 16251 tests passed (2 pre-existing skips)
• full npm run test:ci gate green end-to-end (migrations, schema-drift, env-reference, actionlint, engine/mcp/miner builds+packs, docs/manifest/engine-parity drift, UI lint/typecheck/test/build)
• regenerated apps/loopover-ui/public/openapi.json and routeTree.gen.ts after source changes

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.07%. Comparing base (9a19dff) to head (2b48186).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5761   +/-   ##
=======================================
  Coverage   95.07%   95.07%           
=======================================
  Files         581      581           
  Lines       46181    46181           
  Branches    14811    14811           
=======================================
  Hits        43905    43905           
  Misses       1516     1516           
  Partials      760      760           

Flag	Coverage Δ
shard-1	43.95% <80.76%> (ø)
shard-2	35.74% <46.15%> (ø)
shard-3	32.27% <57.69%> (ø)
shard-4	32.95% <42.30%> (ø)
shard-5	31.76% <34.61%> (-0.01%)	⬇️
shard-6	44.64% <57.69%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ackages/loopover-engine/src/miner/worktree-plan.ts	100.00% <100.00%> (ø)
src/db/repositories.ts	96.71% <100.00%> (ø)
src/github/client.ts	100.00% <ø> (ø)
src/github/e2e-test-commit.ts	100.00% <100.00%> (ø)
src/github/footer.ts	100.00% <100.00%> (ø)
src/github/repo-doc-pr.ts	100.00% <100.00%> (ø)
src/openapi/spec.ts	99.42% <ø> (ø)
src/queue/dlq.ts	100.00% <ø> (ø)
src/queue/processors.ts	95.67% <ø> (ø)
src/queue/review-evasion.ts	100.00% <ø> (ø)
... and 14 more

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