Repository navigation

fix: security and correctness hardening across API, tools, MCP, persistence, and gateways #647

Job	Run time
deadcode	24s
format	27s
module hygiene	51s
vet	52s
secrets	11s
markdown	10s
duplication	21s
smoke	1s
security	1s
test (race + coverage)	1s
fuzz (60s)	1s
lint	1s
build (${{ matrix.goos }}/${{ matrix.goarch }})	1s
	3m 22s