chore(ci): remove dead Codecov upload steps + lock pins

[hyperpolymath]

Removed CI references to apps that are no longer installed on this account/org.

Why this is a fix, not a tidy-up

• Codecov was uninstalled as a GitHub App, but its action steps remain in workflows.
• The estate Actions allowlist already pruned codecov/codecov-action@* (standards/config/settings/actions-allowlist.json -> pruned_from_live_2026_09_02), so a workflow still calling it fails at job start instead of quietly no-op-ing.
• Snyk / Codacy / Mergify / ImgBot / CodeFactor are on the estate never-re-add list (standards spec §9, rulings R1/R4/R5).

Changes

• playground/hives/me/.github/workflows/rust-ci.yml — applied

Notes

• actions.lock entries for the removed actions are deleted in this same commit (the same-PR regen rule in the CI/CD regularisation spec §6.4), so actions-lock-verify sees no drift.
• Removals are line-exact; no other line was reformatted and no comment was re-wrapped.
• Historical records (milestone logs, CHANGELOG, audit docs, specs) that describe the removal were deliberately left untouched.
• The gitar-approved label is intentionally frozen per docs/LABELS.adoc — it is not an active Gitar install, so it stays.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 4d08e7c4-3108-42ae-aebf-e423f44d5fff

📥 Commits

Reviewing files that changed from the base of the PR and between 108628c and d4c88c7.

📒 Files selected for processing (1)

• playground/hives/me/.github/workflows/rust-ci.yml

💤 Files with no reviewable changes (1)

• playground/hives/me/.github/workflows/rust-ci.yml

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Summary

Summary by CodeRabbit

• Chores
  • Removed automatic upload of test coverage reports to the external coverage service.
  • Coverage reports continue to be generated as part of the CI workflow.
  • Formatting checks, linting, tests, release builds, security audits and dependency checks remain in place.

Walkthrough

The Rust CI workflow still generates coverage reports with cargo tarpaulin. It no longer uploads cobertura.xml through codecov/codecov-action.

Changes

Coverage CI

Layer / File(s)	Summary
Remove Codecov upload playground/hives/me/.github/workflows/rust-ci.yml	The coverage job no longer runs the Codecov upload action. Coverage generation remains unchanged.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Bug fix

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the removal of obsolete Codecov CI steps and related lock pins.
Description check	✅ Passed	The description directly explains the removal of obsolete CI references, the Codecov allowlist issue, and the related lock updates.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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_{A rabbit checks the coverage run
The report is made beneath the sun
Codecov no longer takes the file
Tarpaulin waits in steady style
The Rust checks continue in line}

_{Comment @coderabbitai help to get the list of available commands.}