docs: PRD rev1 re-review — repoint PRD heading anchors to GOV.4, complete archive line cites

Addresses CPS-PRD-REV1-REREVIEW findings on PR #1491 head 13968e9a:

F1 (blocker; the CI test failure): docs/PRD.md is now the permanent shim, so
heading-fragment links into the former PRD body no longer resolve —
fleet-documentation.spec.ts failed on docs/fleet/README.md's FCM anchor. The
Part II workstream contracts live in
docs/PRDs/2026-08-31_PRD_rev1/GOV.4-workstream-contracts.md; all five anchored
links in the tree are repointed there (fleet/README.md, TASKS.md,
release-integrity/TASKS.md, ADMIN-GUIDE mos-connector-lease-operations.md,
DEVELOPER-GUIDE mos-runtime-portability-m1.md). Each anchor verified against
the GOV.4 headings with the spec's slug rule. Bundle content unchanged.

F2 (minor): the rev0 archive README's ./ROADMAP.md row now cites all three
source lines (18, 177, 249).

docs/ADMIN-GUIDE/operations/mos-connector-lease-operations.md

@@ -81,4 +81,4 @@ The page may be promoted to an operative runbook only after deny-all is intentio
 ## Related contract
 
 - [M1 logical identity and fencing decision](../../DEVELOPER-GUIDE/architecture/decisions/mos-runtime-portability-m1.md)
-- [MOS-PORT requirements](../../PRD.md#mos-runtime-portability-workstream-mos-port)
+- [MOS-PORT requirements](../../PRDs/2026-08-31_PRD_rev1/GOV.4-workstream-contracts.md#mos-runtime-portability-workstream-mos-port)