INTEGRATION NOTE: Extracted from gstack and renamed gs-investigate to coexist with the host CARL / CAPABILITY-REGISTRY routing. Original gstack documentation follows. Sibling gstack skills referenced below by their original names map to gs-* when installed here (e.g. /review -> gs-review). gstack skills NOT installed in this environment (ship, qa, codex, office-hours, browse, freeze, guard, land-and-deploy) and gstack-only infra (browse binary, ~/.gstack GBrain, bun eval harness) are unavailab
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