M4 is split into M4a and M4b. The M4a spec rests on facts checked against
the owner's server and Mattermost's source at v11.11.0: the REST and
WebSocket shapes, and that clients will not post a message starting with
'/'. Records the design decisions, proposes P15 (secrets from a systemd
credential, the environment or an owner-only file), and adds the run-time
rows egress.md was missing since M2a and M3b.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Every request is recorded, unreadable state is recorded as secret, a
refusal that cannot be recorded is an error, and the other cases the
brokerd reference settled. The audit-unavailable and
broker-state-damaged entries name the new messages; egress lists the
development calls to straylight.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
kyleandClaude Opus 5.5