codecov: widen project threshold to 0.5% for measurement noise

[blehnen]

Follow-up to #211, now that codecov/project is a required check on master.

Problem

project was set to auto + 0% threshold — any decrease fails. But the measurement is not deterministic: commit 78bf5839 was observed reporting 29,373 hits, then 29,512 (+0.41 points) with no code change. Repeat uploads get unioned, and the integration suite covers slightly different paths run to run.

With project required, that noise blocks PRs for no reason.

Change

threshold: 0% → 0.5%.

Still far tighter than the original 2% (which is what allowed coverage to drift downward unnoticed, since auto rebaselines every merge), and comfortably below the size of a real regression — the Dashboard.Ui shortfall this gate exists to prevent is ~2.5 points.

Docs updated with the reasoning so the number isn't mistaken for arbitrary slack.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation

  • Updated code coverage policy guidance to require patch coverage checks.
  • Clarified project coverage thresholds and their relationship to measurement variability.

• Chores

  • Tightened the project coverage ratchet to prevent coverage declines beyond a 0.5% tolerance.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 2ce244c5-39a8-49b8-b536-bff2d1b9f2f4

📥 Commits

Reviewing files that changed from the base of the PR and between 262c807 and 5dcff05.

📒 Files selected for processing (2)

• codecov.yml
• docs/code-coverage.md

---

📝 Walkthrough

Walkthrough

The coverage policy raises the automatic project ratchet threshold from 0% to 0.5%, marks patch coverage as required, and updates comments and documentation to explain the measurement noise floor.

Changes

Coverage gate policy

Layer / File(s)	Summary
Coverage threshold and documentation codecov.yml, docs/code-coverage.md	Codecov uses a 0.5% automatic project threshold, while the coverage documentation marks patch checks as required and explains the updated anti-erosion policy.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• blehnen/DotNetWorkQueue#210: Updates the related Codecov coverage gate policy and documentation.

Poem

A rabbit checks the coverage line,
“Half a percent” now keeps it fine.
Patch gates stand required and bright,
Noise no longer starts a fight.
Hop, hop—clean builds take flight!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: increasing the Codecov project threshold to 0.5% to account for measurement noise.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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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[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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.09%. Comparing base (1c5d11a) to head (5dcff05).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #212      +/-   ##
==========================================
+ Coverage   88.06%   88.09%   +0.02%     
==========================================
  Files        1022     1022              
  Lines       33476    33476              
  Branches     2790     2790              
==========================================
+ Hits        29480    29490      +10     
+ Misses       3133     3126       -7     
+ Partials      863      860       -3     

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