The HTTP door for the capture capability. Thin: authenticate → derive trust-zone origin → decode → capture.Service → map receipt to status. - Auth mirrors the chassis Bearer precedence (static token wins, then Dex JWT) but returns the resolved principal + auth path, which the chassis middleware hides — capture needs the principal to derive the origin. Depends on a small Validator interface (the chassis *JWTValidator satisfies it) so the JWT/origin path is testable without a live JWKS. - OriginResolver maps principal → trust zone: static-token caller and allowlisted JWT subjects → sovereign; every other principal → us-nexus (fail safe, so the I1 gate refuses confidential by default). Principal and origin are server-set on the input, overwriting any body the caller sent. - HTTP status: 200 all-ok / dry-run, 207 partial, 502 all-failed, 403 on the I1 refusal, 400 on fail-closed validation. - Wired in main behind the same static+JWT credentials as /mcp, reusing the MCP server's graph-wired brain store (one implementation) and the classification tags (#50). Mounts only when a Gitea tracker is configured. Sovereign JWT principals via BRAIN_CAPTURE_SOVEREIGN_PRINCIPALS. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>