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: 3624cd98-04ef-4261-acce-8e7f339192e2

📥 Commits

Reviewing files that changed from the base of the PR and between d0325ce and 1edfe34.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

💤 Files with no reviewable changes (1)

• .github/workflows/ci.yml

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📜 Recent review details

⏰ Context from checks skipped due to timeout. (1)

• GitHub Check: submit-nuget

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📝 Summary

Summary by CodeRabbit

• Chores
  • Coverage reports are no longer uploaded to the external coverage reporting service after successful push events.

Walkthrough

The CI test job no longer uploads coverage reports to Codecov after successful push events.

Changes

CI coverage reporting

Layer / File(s)	Summary
Remove Codecov upload step .github/workflows/ci.yml	The workflow removes the conditional Codecov coverage-upload step, token, and non-failing upload configuration.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description directly explains the removal of obsolete Codecov workflow steps and related lock entries. It matches the pull request objectives.
Title check	✅ Passed	The title clearly identifies the removal of obsolete Codecov upload steps and lock pins. It accurately summarises the main changes.
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 workflow gate
No coverage parcel leaves the crate
Codecov waits beyond the trail
The test job ends without a fail
CI hops on, light and neat}

_{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