Phase 5 now references the architect role and SDD process from
docs/sdd_process.md instead of creating ad-hoc spec stubs. Added
key new ADRs and architecture docs the architect will need to produce.
Updated gitserver reference note (MPL concern, archive it).
Kept rudolfs reference (MIT/Apache, fork candidate).
Also removed 'needs-update' status from the lifecycle states since
it's not part of the SDD process — stale docs get annotated with a
note and existing status, not a new status.
glm-5.1
d003a4f4ec