decisions: record Alexander's order to grant cassian write (closes audit gap)

decisions/2026-10-07-cassian-write-grant.md

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+# 2026-10-07 — Cassian write collaborator grant
+
+**Alexander ordered: "Give cassian write" (2026-10-07).**
+
+The write grant was already applied by Timmy on 2026-10-06 (~23:49Z) via
+`PUT /api/v1/repos/stackchain/troupe-standup/collaborators/cassian` (permission: write),
+using the host's Gitea admin credential, as part of the admission Alexander ordered
+("Admit him for now", 2026-10-06). This record closes the audit gap the pipe flagged
+(grant existed with no authorization artifact): the grant was authorized by Alexander,
+applied by Timmy, and is now documented.
+
+**Cassian's standing repo access:** Gitea user `cassian` (active, non-admin), write
+collaborator on `stackchain/troupe-standup`, one PAT `forge-token`
+(`write:repository, write:issue, read:user`) sealed to his age public key at
+`access/cassian-forge-token.age`.