capture — the single ingestion entrypoint

When the user wants to save a thought, an article snippet, a transcript fragment, or any text into their brain, run gbrain capture. Don't reach for gbrain put or commit-then-sync — capture is the front door and it handles both local and thin-client installs the same way.

Contract

• Input: the content to save (inline arg, --file PATH, or --stdin).
• Output: a page in the brain DB AND a markdown file on disk under <sync.repo_path>/<slug>.md. Receipt printed to stdout.
• Side effect: the page becomes immediately queryable via gbrain query, gbrain search, or any MCP-bound agent.
• Idempotency: same content → same inbox/YYYY-MM-DD-<hash8> slug. The daemon's 24h content-hash dedup catches re-captures.
• Trust: all captures via this skill are local-CLI trust (remote: false). Untrusted webhook ingestion goes through POST /ingest, not this verb.