docs: rename AI-contributor tooling and meta-docs for LoopOver

[JSONbored]

Summary

Renames genuine brand-prose mentions of "gittensory" to "LoopOver" across AGENTS.md/CLAUDE.md (the AI-contributor guide auto-loaded by Codex and Claude Code), the .claude/skills/contributing-to-gittensory/ skill directory (renamed to contributing-to-loopover/, including its own frontmatter name: field and cross-references in CONTRIBUTING.md and scripts/check-schema-drift.mjs), and THIRD_PARTY_NOTICES.md.

As with the earlier docs-copy pass (#5376), every not-yet-renamed technical identifier is left untouched: npm package names, check-run names, the .gittensory.yml config filename, GITTENSORY_-prefixed env vars, the repo path, and MCP tool names -- each is tracked by its own separate rebrand issue.

Found and deliberately left alone

src/review/repo-skill-render.ts's REPO_SKILL_MARKER_START/END constants (<!-- gittensory-skill-doc:start/end -->) are live, externally-persisted HTML comment markers already baked into other repos' generated skill files by this feature's own refresh mechanism (confirmed wired up via src/github/repo-doc-pr.ts). Renaming them risks breaking refresh for any repo where this has already run -- the same class of risk as the check-run-name and visual-capture-fallback.yml rebrand issues. Only the file's descriptive comments referencing the skill directory path were updated.

CONVERGENCE_RUNBOOK.md is excluded pending a maintainer decision on whether an internal engineering runbook is in scope for this rebrand pass at all.

Test plan

• npm run typecheck
• Comprehensive sweep confirming zero remaining contributing-to-gittensory references anywhere in the repo
• Confirmed the 4 test files referencing AGENTS.md/CLAUDE.md all test the generic repo-doc-generation feature for arbitrary external target repos, not this repo's own root files -- none needed changes
• Full test:ci gate green end-to-end

Closes #5334.

[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 94.45%. Comparing base (0d78f24) to head (54f6227).
⚠️ Report is 17 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5431   +/-   ##
=======================================
  Coverage   94.45%   94.45%           
=======================================
  Files         552      552           
  Lines       44310    44310           
  Branches    14659    14659           
=======================================
  Hits        41851    41851           
  Misses       1784     1784           
  Partials      675      675           

Flag	Coverage Δ
shard-1	44.17% <ø> (ø)
shard-2	34.62% <ø> (ø)
shard-3	31.51% <ø> (ø)
shard-4	31.51% <ø> (ø)
shard-5	33.34% <ø> (ø)
shard-6	43.33% <ø> (ø)

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

Files with missing lines	Coverage Δ
src/review/repo-skill-render.ts	100.00% <ø> (ø)

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