Fix first-run microphone config setup

[psremilio]

Fixes #7.

Summary

• Resolve microphone config loading and saving to the repository-root mic_config.json, with a BONZI_MIC_CONFIG override path available for tests or custom installs.
• Treat missing, invalid, or old mic_index configs as first-run setup instead of crashing or silently using a checked-in per-machine value.
• Stop tracking the generated local mic_config.json and ignore local config, env, and Python cache files.
• Load helpers/.env explicitly and clarify the first-run setup/reset steps in the README.
• Add focused unittest coverage for missing config, override config path, invalid JSON, legacy config shape, and save/load round trips.

Verification

• python -m unittest discover -s tests (6 tests)
• python -Wall -m py_compile main.py helpers\mic.py helpers\llm.py helpers\tts.py tests\test_mic_config.py
• python -c "from helpers import mic; print(mic.DEFAULT_CONFIG_FILE); print(mic.load_config())"
• git diff --check origin/main...HEAD

I did not run a live microphone smoke test in this environment because PyAudio/audio hardware is not available here.

[psremilio]

/claim #7

Claiming the Opire reward for this PR.

This PR fixes the first-run setup problem by:

• resolving microphone config to the repository-root mic_config.json
• treating missing, invalid, or legacy mic_index config as first-run setup
• removing the checked-in local mic_config.json and ignoring generated local config/env/cache files
• loading helpers/.env explicitly
• adding focused unittest coverage for missing config, invalid JSON, legacy config, and save/load round trips

Verified locally:

• python -m unittest discover -s tests
• python -Wall -m py_compile main.py helpers\mic.py helpers\llm.py helpers\tts.py tests\test_mic_config.py
• python -c "from helpers import mic; print(mic.DEFAULT_CONFIG_FILE); print(mic.load_config())"
• git diff --check origin/main...HEAD

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[psremilio]

Follow-up on current head 5e8328006537038162a1ace9fd00f09b60be2d0b:

• Added focused coverage for the BONZI_MIC_CONFIG override path so the documented custom config path is tested end to end.
• Re-ran local verification:
  • python -m unittest discover -s tests (6 tests)
  • python -Wall -m py_compile main.py helpers\mic.py helpers\llm.py helpers\tts.py tests\test_mic_config.py
  • python -c "from helpers import mic; print(mic.DEFAULT_CONFIG_FILE); print(mic.load_config())"
  • git diff --check origin/main...HEAD

GitHub currently reports no Actions/check runs for this repo/commit, and PR #12 is mergeable against main.