Make Codecov patch coverage informational

[p-keminer]

Summary

• keep the whole-firmware coverage baseline and its zero-hit hardware-source reporting
• make only codecov/patch informational so uncovered firmware diffs remain visible without presenting hardware/PCAP-tested changes as failed CI
• leave the native Unity tests, firmware build matrix, and codecov/project behavior unchanged

Why

The native PlatformIO target currently builds only the host-testable MarauderMacAddress.cpp. The whole-source coverage step intentionally records all other firmware implementation lines as uncovered. As a result, ordinary UI, WiFi, SD, BLE, and RF changes receive 0% patch coverage even when the native tests and all firmware builds pass.

Validation

• official Codecov YAML validator: Valid!
• git diff --check
• one new repository-root file only; no firmware or workflow changes

Once this lands, existing firmware PR checks can be rerun after synchronizing with the updated develop branch.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.40%. Comparing base (66f3c81) to head (871ab84).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #1448   +/-   ##
=======================================
  Coverage     0.40%   0.40%           
=======================================
  Files           20      20           
  Lines        17176   17176           
  Branches        11      11           
=======================================
  Hits            69      69           
  Misses       17103   17103           
  Partials         4       4           

Flag	Coverage Δ
firmware-unit-tests	0.40% <ø> (ø)

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[Copilot]

Pull request overview

Adds a minimal Codecov configuration to make the codecov/patch status check informational, while leaving overall/project coverage behavior intact so whole-firmware coverage remains visible (including intentional zero-hit hardware-bound lines) without blocking CI on patch coverage.

Changes:

• Introduce a repository-root codecov.yml configuring coverage.status.patch.default.informational: true.
• Document (via header comments) why patch coverage is informational given the current native harness coverage limitations.

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