0.26.0 — delegation: which agent acts, for which person (B-155)

[sshlg]

Closes B-155. agent-interop/references/gateway.md gains § Delegation — who is acting, and for whom and three new traps; agent-interop's reference table names delegation as a reason to load the file.

The doctrine is vendor-neutral first. Fabric fabric-delegation/0.1 is the worked example: DEC-0039 at passioncode-ai/fabric-agent-contract@8e49fbd, ADR-0144 at passioncode-ai/fabric@812876cf, both main commits fetched by ref.

Checks:

• npm test exits 0.
• The spec-pin check failed on a multi-line pin before the pin was split into its own "Delegation pinned" line.
• An independent fact-check against the spec found 6 issues. Five were fixed:
  • sub is always a person, even under an agent grant;
  • the descriptor token is retired only once callers can mint;
  • the JCS digest requires plain JSON values;
  • "implements all" is narrowed;
  • the gateway audit sentence is marked as this file's own rule.
• The sixth finding (the pins appear in neither source) is answered: both files were fetched at those exact refs.

Version 0.26.0 in every home; CHANGELOG, verification ledger and board updated.

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