jif 0e82c62a44 Embed defaults in the packaged config layer (#38179) ...

## What changed

- Add an embedded `defaults.toml` and always install it as the lowest-precedence configuration layer when no packaged-defaults path is supplied.
- Keep packaged defaults out of config RPC layer and origin metadata.
- Report a user setting as overridden only when the effective layer has higher precedence, so clearing a setting can fall back to its packaged default without a false override.

## Testing

- Cover loading the packaged layer when other configuration files are absent.
- Cover config RPC filtering and clearing a user value that falls back to a packaged default.

GitOrigin-RevId: c1c0e1e681e4ac1be2602550972533443c5df51b

2026-08-12 12:15:47 +00:00

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