fix(ci): update remaining gittensory references in workflow files

[JSONbored]

Summary

• release-selfhost.yml carried a real bug, not just stale naming: SENTRY_PROJECT isn't set as a repo variable (confirmed via gh variable get), so every release build was falling back to the hardcoded default 'gittensory' — the Sentry project's pre-rename slug — for all Sentry API calls. Separately, the release=gittensory-orb@${VERSION} step output feeds SENTRY_RELEASE (3 places) and LOOPOVER_VERSION on every release, meaning this workflow was actively regenerating the exact stale value I found and removed from the server's .env earlier this session, not just leaving an old leftover. Fixed the job-level default, all 3 step-level vars.SENTRY_PROJECT || fallbacks, and the release-string template.
• selfhost.yml and visual-capture-fallback.yml had only cosmetic references: a throwaway CI-only test Postgres DB name, Docker image tags scoped to a single job run, and prose comments describing current backend behavior. Updated for consistency/clarity.
• Left untouched: the two comments in release-selfhost.yml (lines 8, 224) that correctly document a past Docker-image-naming decision (Retire every deprecation shim #4777) in historical-past-tense framing — those are legitimate history, not drift.

Scope

• Narrow, single-purpose change (workflow files only)
• No secrets/private terms touched
• No changelog edit

Validation

• npm run actionlint — clean
• git diff --check — clean
• Confirmed via git grep that only the 2 legitimate historical comments remain across all 3 files

[superagent-security]

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

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
12110	1	12109	1

View the top 1 failed test(s) by shortest run time

test/unit/release-selfhost-prerelease.test.ts > release-selfhost.yml "Resolve version" step (#1937) > accepts a stable semver tag and marks it non-prerelease

Stack Traces | 0.138s run time

AssertionError: expected { v: '0.1.0', tag: 'orb-v0.1.0', …(2) } to match object { v: '0.1.0', tag: 'orb-v0.1.0', …(2) }

- Expected
+ Received

  {
    "prerelease": "false",
-   "release": "gittensory-orb@0.1.0",
+   "release": "loopover-orb@0.1.0",
    "tag": "orb-v0.1.0",
    "v": "0.1.0",
  }

 ❯ test/unit/release-selfhost-prerelease.test.ts:58:23

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