docs: PRD rev1 review Q90 — Prettier-format the bundle, add rev0 archive README

Addresses CPS-PRD-REV1-REVIEW-Q90 findings F1 and F3 on PR #1491:

F1 (format gate): `prettier --write` on the 18 rev1 bundle documents.
Whitespace, table padding, list markers and emphasis delimiters only — a
normalized token comparison of every file before/after shows zero content
difference, so the ratified text is unchanged and no re-ratification applies.

F3 (rev0 relative links): the archived rev0 PRD stays byte-identical
(sha256 60cc2f98...36afdf verified) per GOV.1 archive-never-edit. A sibling
docs/PRDs/2026-08-26_PRD_rev0/README.md records the digest, the original
location, the owner disposition that the in-file links are intentionally
historical, and a resolution table for all 9 targets (11 occurrences), each
verified to exist. Future relocated archives ship the same README instead of
edited bytes.

F2 (test step) is investigated separately against the CI log.

docs/PRDs/2026-08-31_PRD_rev1/SESS.1-session-continuity.md

@@ -15,12 +15,12 @@ intervention and no noticeable performance degradation.
 
 ## Two operations, two code paths — never merged
 
-| | Harness / model / provider switch | Role switch |
-|---|---|---|
-| Session id | preserved | seat identity preserved; session is **clean** |
-| Context | fully transferred | **ephemeral context discarded** (register OD-03) |
-| Governed by | this section | [[SEAT.1-seat-profile]] §role-binding |
-| Why | continuity requirement | an active session never switches roles (register OD-02) |
+|             | Harness / model / provider switch | Role switch                                             |
+| ----------- | --------------------------------- | ------------------------------------------------------- |
+| Session id  | preserved                         | seat identity preserved; session is **clean**           |
+| Context     | fully transferred                 | **ephemeral context discarded** (register OD-03)        |
+| Governed by | this section                      | [[SEAT.1-seat-profile]] §role-binding                   |
+| Why         | continuity requirement            | an active session never switches roles (register OD-02) |
 
 ## The ratified mechanism already exists: register OD-57–OD-61
 
@@ -39,7 +39,7 @@ The 2026-08-28 register confirms the machinery this requirement needs:
 
 A mid-stream harness switch is therefore an OD-59 relaunch keyed to a persistent
 Stack session id: checkpoint → stop → reconfigure → new incarnation →
-restore → resume. What OD-59 does not yet promise is the *experience* bar — no
+restore → resume. What OD-59 does not yet promise is the _experience_ bar — no
 user intervention, no noticeable degradation — which is this PRD's addition.
 
 ## Identity layering
@@ -63,6 +63,7 @@ Context-transfer fidelity between harnesses with different context formats,
 tool-call encodings, and system-prompt injection points. The checkpoint (OD-57)
 is the transfer vehicle; whether a checkpoint alone meets "no noticeable
 degradation" across harness families is unproven: [[GOV.5-open-questions]] Q-S3.
+
 ## Session lifecycle state machine (pulled 2026-08-31 from the session-lifecycle draft — with one required extension)
 
 The operator draft (`workflows/session-lifecycle.md`, the densest