Clarify Sheets fallback in auth diagnostics

Handle Google Chat room URL message tokens

Normalize Google Chat message ordering

Add Google Chat thread reads and setup guidance

Add Google Chat read tools

Support bundled OAuth desktop client

Prompt for OAuth client credentials during login

Auto-discover OAuth client secrets in config dir

Add reliable module entrypoint

Add OAuth logout flow

Improve OAuth client secret path handling

Fix auth fallback for scoped Google credentials

Add annotated sheet text for styled runs

Refactor package structure for maintainability

Resolve sheet URL context and auth scope handling