Rename lingering GitHub artifacts

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Problem: Some currently open GitHub artifacts — milestone titles, project-board titles/descriptions, issue titles — spell out the old brand name directly, independent of anything in the codebase.

Area: GitHub housekeeping

Proposal: Audit every open (not closed) milestone, issue, and project-board title/description for literal old-brand mentions, and rename them once the code-side rename is live. Closed and historical items are left untouched — this only cleans up what's still open and forward-facing.

Deliverables:

• A short audit list of affected open artifacts.
• Each one renamed.

Acceptance criteria:

• No currently open milestone, issue, or project-board title still spells out the old brand name.

Test scenarios:

• Search across open issues, milestones, and project titles for the old name after the sweep and confirm only closed/historical items remain.

Resources:

• GitHub's own search and the project boards' settings pages.

Boundaries:

• Do not touch closed issues, closed PRs, or historical records — this is scoped strictly to what's currently open.

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Part of #4761.

[linear-code]

JSO-3448

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Audited every currently-open milestone, issue, and project board for literal old-brand ("Gittensory") mentions in titles/descriptions.

Found and fixed 2 stale artifacts:

• Issue Roadmap: self-hosted review-stack enhancements (loopover orb) #1953: title renamed "...(gittensory orb)" -> "...(loopover orb)"; its body also quoted the check-run name as "Gittensory Orb Review Agent", which is now stale since that check-run was renamed to "LoopOver Orb Review Agent" earlier in this migration (Rename bot-posted check-run/status names and PR-comment branding, with a dual-emit grace period #5327/refactor(rebrand): rename bot-posted check-run names and PR-comment branding #5468) -- fixed to match.
• Project board fix(changelog): label mcp release workflow changes #13: title renamed "Self-Hosted Review Stack (Gittensory Orb)" -> "Self-Hosted Review Stack (LoopOver Orb)".

All 7 milestones (open + closed) checked -- no stale titles. Every other open-issue hit for "gittensory" (in titles like gittensory-miner init --interactive, gittensory-ui-kit, @gittensory command references, gittensory.aethereal.dev domain) correctly describes still-unrenamed, currently-real identifiers tracked by their own separate rebrand issues (#4769/#5328 npm packages, #4772 GitHub App, the domain) -- left untouched since renaming those issue titles would misdescribe current reality.