Merge secfix/authz into secfix/merge
Resolve overlaps with the auth, git and integrations fixes: MergeFix needs write on a non-archived pull; releases combine archive checks with tag protection; forks pass both the account and fork policy checks; collaborator and org removal run the fork revocation sweep and the follower purge; sessionHandleIsLive reads the D1 sessions table; the legacy webhook envelope uses its own HKDF purpose and tolerates the v2 ciphertext prefix.
77 files changed+2253−245
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