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: 8d3829be-3c4a-4bff-a859-ccfcca32b930

📥 Commits

Reviewing files that changed from the base of the PR and between 62b750b and c0490b2.

📒 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
  • Coverage reports are no longer uploaded to Codecov during continuous integration.

Walkthrough

The CI coverage job no longer uploads cobertura.xml to Codecov. It now ends after generating the coverage report.

Changes

CI coverage reporting

Layer / File(s)	Summary
Remove Codecov upload .github/workflows/ci.yml	The coverage job no longer runs the Codecov upload step. Coverage report generation remains the final job action.

Priority: ⬇️ Low

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

Change: Other

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the removal of obsolete Codecov CI steps and lock pins. It matches the pull request objectives.
Description check	✅ Passed	The description directly explains the removal of obsolete CI references and corresponding lock entries. It matches the changeset and objectives.
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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The report rests in its final file
No Codecov upload hops along
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