Add codecov threshold to unblock dependency update PRs

[compscidr]

Summary

• Adds .codecov.yml with a 2% project coverage threshold
• All 6 open Renovate PRs (Update dependency androidx.compose:compose-bom to v2026.03.00 #208, Update plugin gradleup-nmcp-aggregation to v1.4.4 #211, Update compose.ui.tooling to v1.10.5 #214, Update kotlin monorepo to v2.3.10 #222, Update dependency com.android.application to v9.1.0 #224, Update Gradle to v9.4.0 #225) are failing codecov/project due to minor coverage fluctuations (0.15-1.02%) caused by dependency version changes, not source code changes
• Once this is merged, rebasing those PRs will let them pass

Coverage failures across open PRs

PR	Coverage	Drop
#225 (Gradle 9.4.0)	60.48%	-1.02%
#224 (AGP 9.1.0)	61.35%	-0.15%
#222 (Kotlin 2.3.10)	60.82%	-0.68%
#214 (Compose UI Tooling 1.10.5)	61.25%	-0.25%
#211 (NMCP 1.4.4)	60.86%	-0.63%
#208 (Compose BOM 2026.03.00)	60.53%	-0.68%

All are within the 2% threshold.

Test plan

• Merge this PR
• Rebase/retry the Renovate PRs — codecov/project should pass

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds a Codecov configuration to relax the codecov/project status check so dependency-only Renovate PRs aren’t blocked by small coverage fluctuations.

Changes:

• Introduces .codecov.yml to allow up to a 2% project coverage drop.
• Configures Codecov status checks for project (and also patch).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.59%. Comparing base (4f028fe) to head (a42a167).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #227      +/-   ##
============================================
- Coverage     62.07%   61.59%   -0.49%     
+ Complexity      235      229       -6     
============================================
  Files            15       15              
  Lines          2070     2070              
  Branches        315      315              
============================================
- Hits           1285     1275      -10     
- Misses          607      611       +4     
- Partials        178      184       +6     

Flag	Coverage Δ
libunittests	61.59% <ø> (-0.49%)	⬇️

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