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: df565430-4b4a-4b49-acc0-4d19d0ccc49e

📥 Commits

Reviewing files that changed from the base of the PR and between 43fb5be and 3d0b324.

📒 Files selected for processing (1)

• .github/workflows/CI.yml

💤 Files with no reviewable changes (1)

• .github/workflows/CI.yml

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📝 Summary

Summary by CodeRabbit

• Chores
  • Test coverage is now processed and reported locally rather than uploaded to an external service.

Walkthrough

The CI test job no longer uploads coverage data to Codecov. Local coverage processing remains in place.

Changes

CI coverage reporting

Layer / File(s)	Summary
Remove Codecov upload .github/workflows/CI.yml	The test job no longer runs codecov/codecov-action or sends lcov.info with CODECOV_TOKEN.

Priority: ⬇️ Low

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

Change: Other

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description clearly relates to the removal of obsolete CI application references and matching lock entries.
Title check	✅ Passed	The title clearly identifies the main change: removing dead Codecov CI steps and their lock pins.
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 testing trail
Coverage stays within the local burrow
No external upload hops away
The workflow grows one step lighter
Green checks rest close to home}

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