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

• .github/workflows/actions.lock — applied
• .github/workflows/coverage.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: 6ca39d85-8230-4d70-b441-3c09528515fe

📥 Commits

Reviewing files that changed from the base of the PR and between b76ce7e and 93bb540.

⛔ Files ignored due to path filters (1)

• .github/workflows/actions.lock is excluded by !**/*.lock

📒 Files selected for processing (1)

• .github/workflows/coverage.yml

💤 Files with no reviewable changes (1)

• .github/workflows/coverage.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
  • Code coverage workflows now generate coverage reports without uploading them to the external reporting service.

Walkthrough

The coverage workflow still generates lcov.info. It no longer uploads the report to Codecov.

Changes

Coverage workflow

Layer / File(s)	Summary
Coverage report generation .github/workflows/coverage.yml	Removes the Codecov upload step. The workflow ends after cargo llvm-cov creates lcov.info.

Priority: ⬇️ Low

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

Change: Other

Suggested reviewers: metadatastician

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the removal of obsolete Codecov CI upload steps and related lock pins, which matches the main changes.
Description check	✅ Passed	The description directly explains the removal of obsolete Codecov references, the affected workflow files, and the reason for the CI change.
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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_{I am a rabbit with coverage in sight
The report now rests after its run is right
No Codecov hop follows the trail
lcov.info stays in the burrow without fail
Ears up for a cleaner workflow tonight}

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