Update V1 & V2 core documents and reorganize docs folder

docs/ver1/release_checklist_v1.md

@@ -18,8 +18,8 @@ Use this checklist before declaring V1 operationally complete.
 
 ## C) Operational Readiness
 
-- [ ] `docs/runbook.md` reviewed and current.
-- [ ] `docs/migration_v1.md` reviewed and current.
+- [ ] `runbook_v1.md` reviewed and current.
+- [ ] `migration_v1.md` reviewed and current.
 - [ ] Backup and rollback procedures tested at least once.
 - [ ] Incident escalation packet template is known to operators.
 
@@ -28,14 +28,14 @@ Use this checklist before declaring V1 operationally complete.
 - [ ] Lint/type checks pass.
 - [ ] `pytest -m "not external" -q` passes.
 - [ ] Targeted external/provider checks executed (if credentials available).
-- [ ] Release evidence recorded in `docs/release_evidence_v1.md`.
+- [ ] Release evidence recorded in `release_evidence_v1.md`.
 
 ## E) Traceability and Documentation
 
-- [ ] `docs/requirements.md` aligns with implemented V1 behavior.
-- [ ] `docs/architecture.md`, `docs/schema.md`, and `docs/error_handling.md` are consistent.
-- [ ] `docs/traceability_v1.md` is updated with current implementation and test evidence.
-- [ ] `docs/ver1/ver1.md` phase status updated with evidence references.
+- [ ] `requirements_v1.md` aligns with implemented V1 behavior.
+- [ ] `architecture_v1.md`, `schema_v1.md`, and `error_handling_v1.md` are consistent.
+- [ ] `traceability_v1.md` is updated with current implementation and test evidence.
+- [ ] `implementation_plan_v1.md` phase status updated with evidence references.
 - [ ] REQ traceability evidence links recorded (tests/runbook/checks).
 
 ## Release Sign-Off