fix: register LAST30DAYS_DEBUG in env keys, lazy resolution, fix xai_x crash

[23241a6749]

Summary

LAST30DAYS_DEBUG had three bugs:

1. Not registered in CONFIGURATION_KEYS — .env values were silently ignored.
2. Eager module-level os.environ.get() in log.py — --debug flag and .env values never picked up.
3. http.DEBUG in xai_x.py:144 — AttributeError on xAI API errors.

[greptile-apps]

Greptile Summary

This PR fixes debug-mode configuration and the xAI error logging path. The main changes are:

• Registers LAST30DAYS_DEBUG in the config loader.
• Resolves debug mode lazily from os.environ.
• Accepts on as a debug truthy value.
• Uses log.is_debug() when logging full xAI error responses.
• Documents --debug and the env-based debug option.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
CONFIGURATION.md	Adds documentation for --debug and LAST30DAYS_DEBUG.
skills/last30days/scripts/lib/env.py	Registers LAST30DAYS_DEBUG and exports loaded values without overriding shell values.
skills/last30days/scripts/lib/log.py	Makes debug checks lazy and accepts on as a truthy value.
skills/last30days/scripts/lib/xai_x.py	Uses log.is_debug() for full xAI error-response logging.

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