Fix/settings json env override warning

[svd]

Summary

Detects when ~/.claude/settings.json contains env entries that silently override the environment variables CodeMie sets at spawn time (e.g. ANTHROPIC_BASE_URL,
ANTHROPIC_AUTH_TOKEN, ANTHROPIC_MODEL). When a conflict is found, a clear warning is printed before Claude launches so users understand why their CodeMie profile
settings are not taking effect.

Changes

• Added conflict-detection logic to the Claude plugin's beforeRun lifecycle hook that reads ~/.claude/settings.json and compares its env keys against all vars defined in ClaudePluginMetadata.envMapping
• Emits a user-visible console.warn (yellow, emoji-prefixed) listing each conflicting variable with its value (or REDACTED for sensitive keys), with actionable guidance to remove them
• Sensitive values are automatically masked for env vars containing: TOKEN, KEY, SECRET, PASSWORD, or AUTH (case-insensitive)
• Logs the conflict via logger.warn with sanitized args for debug traceability
• No changes to settings.json are made — the fix is purely informational and non-destructive

Impact

Before: If ~/.claude/settings.json contained "env": { "ANTHROPIC_BASE_URL": "..." }, CodeMie would silently report the correct profile/model while Claude actually
connected to the wrong endpoint — no indication anything was wrong.

After: The user sees this warning before Claude starts:

 ⚠️  Warning: ~/.claude/settings.json contains env vars that will override CodeMie profile settings:
     - ANTHROPIC_AUTH_TOKEN: ***REDACTED***
     - ANTHROPIC_BASE_URL: "https://some-custom-endpoint.example.com"
     These settings.json values take precedence over your CodeMie profile.
     Remove them from ~/.claude/settings.json to allow CodeMie to control these settings.

Checklist

• Self-reviewed
• Manual testing performed
• Documentation updated (if needed)
• No breaking changes (or clearly documented)