feat(mcp): get_config tool #126

Job	Run time
Preflight (fmt, clippy, check, agents-md)	26s
Determinism	38s
cargo-deny	36s
Test (windows-latest)	3m 12s
Test (macos-latest)	1m 40s
Test (ubuntu-latest)	1m 16s
Size guard (<25 MiB)	1m 52s
MSRV (1.95)	22s
Docs (build, no deploy)	39s
Coverage	1m 20s
	12m 1s

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