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/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: 8c92559b-4c7d-4c25-8fa1-e35ead41c1ad

📥 Commits

Reviewing files that changed from the base of the PR and between 6c04555 and b37b122.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

💤 Files with no reviewable changes (1)

• .github/workflows/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 coverage report uploads from the continuous integration workflow.
  • Coverage reports continue to be generated during testing.

Walkthrough

The CI test job still generates coverage data but no longer uploads ./extension/coverage/lcov.info to Codecov.

Changes

CI coverage reporting

Layer / File(s)	Summary
Remove Codecov upload step .github/workflows/ci.yml	The test job removes the Codecov action. Coverage generation remains unchanged.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 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 inactive Codecov CI steps and related lock pins. It matches the main change.
Description check	✅ Passed	The description directly explains the removal of inactive CI references, the Codecov action, related lock entries, and the intended scope.
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 hops through tests at night
The coverage file stays in sight
Codecov’s step now rests
While CI runs its checks
And green leaves mark the flight}

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

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud