fix(gateway): suppress ERROR logs on startup discovery status request NACKs (#406)

[GreenGrassBlueOcean]

Summary

Resolves #406. Follows up on feedback from @TheDarkWizard in #402 and coordinates with upstream OWNd fix OpenWebNet-HA/OWNd#44.

Root Cause

During startup discovery (initial_discovery()), general status requests (*#2*0##, *#4*0##, *#16*0##) probe the SCS bus for optional or unconfigured subsystems. When subsystems are not installed (e.g., no audio matrix, or standalone thermostats with no central heating unit 0), the gateway returns NACK (*#*0##).

Prior to OWNd 2.0.0b9, intermediate retries on status requests were logged at ERROR before concluding cleanly at DEBUG on attempt 2 ("Subsystem or device may not be present"). This produced alarming red [ERROR] logs in Home Assistant on every reboot.

Defense-in-Depth Solution

This PR provides immediate protection in Home Assistant while coordinating with the upstream protocol library:

1. custom_components/myhome/gateway.py:
   • Added _StatusRequestLogFilter to LOGGER. Intermediate retry logs for status requests (*#...##) are safely downgraded from ERROR to DEBUG.
   • Regular command errors (*WHO*WHAT*WHERE##) and unexpected exceptions remain completely unaffected at ERROR.
2. tests/test_gateway.py:
   • Added test_status_request_log_filter asserting status-request retry errors are downgraded to DEBUG while command errors and other exceptions remain ERROR.
3. tests/test_phase1_architecture.py:
   • Added error log verification in test_harness_nack_simulation to verify status request NACK error suppression.

Verification

• test_gateway.py and test_phase1_architecture.py: 90 passed.
• verify_ha_standards.py: All 18 checks passed, Platinum Quality Scale clean.
• ruff check: 0 violations.

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✅ All modified and coverable lines are covered by tests.

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[GreenGrassBlueOcean]

🔒 Merge Lock Applied:
This pull request has been converted to Draft and tagged with the blocked: upstream label.

Conditions for unlocking and merging:

1. Upstream PR OpenWebNet-HA/OWNd#44 must be merged into OpenWebNet-HA:master.
2. A new version of OWNd (>= 2.0.0b8) must be published to PyPI.
3. Once published, custom_components/myhome/manifest.json requirements will be bumped to "requirements": ["OWNd==2.0.0b8"] and the assertion gate in tests/test_phase1_architecture.py removed.
4. After CI validates the bumped pin, the PR will be marked as "Ready for review" and merged.

[GreenGrassBlueOcean]

ℹ️ Update: OWNd 2.0.0b8 was officially released to PyPI containing the HMAC refactor (Release v2.0.0-b8).

This PR's merge lock now targets OWNd >= 2.0.0b9, which will be the dedicated release for the startup status request NACK logging fix (OpenWebNet-HA/OWNd#44).