gpt-5.3-codex review phase 1 - Flatten the documentation

docs/ver4/history.md

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+# V4 Revision History (Archived)
+
+This index tracks superseded V4.x documents as historical context.
+These revisions were intentionally removed from the active working tree to prevent accidental reuse by tools and AI agents.
+They are preserved at immutable git tag `docs-v4x-archive`.
+
+## Archive Map
+
+| Revision | Archived Paths at `docs-v4x-archive` |
+| :--- | :--- |
+| V4.0 | `docs/ver4.0/scope_boundary_v4.md`, `docs/ver4.0/implementation_plan_v4.md` |
+| V4.1 | `docs/ver4.1/scope_boundary_v4_1.md`, `docs/ver4.1/implementation_plan_v4_1.md` |
+| V4.2 | `docs/ver4.2/scope_boundary_v4_2.md`, `docs/ver4.2/implementation_plan_v4_2.md` |
+| V4.3 | `docs/ver4.3/scope_boundary_v4_3.md`, `docs/ver4.3/implementation_plan_v4_3.md` |
+| V4.4 | `docs/ver4.4/scope_boundary_v4_4.md`, `docs/ver4.4/implementation_plan_v4_4.md` |
+| V4.5 | `docs/ver4.5/scope_boundary_v4_5.md`, `docs/ver4.5/implementation_plan_v4_5.md` |
+| V4.6 | `docs/ver4.6/scope_boundary_v4_6.md`, `docs/ver4.6/implementation_plan_v4_6.md`, `docs/ver4.6/review_log_v4_6.md` |
+| V4.7 | `docs/ver4.7/scope_boundary_v4_7.md`, `docs/ver4.7/implementation_plan_v4_7.md`, `docs/ver4.7/review_log_v4_7.md` |
+| V4.8 | `../ver4.8/feature_backlog_v4_8.md` |
+
+To inspect archived content locally:
+
+`git show docs-v4x-archive:docs/ver4.6/scope_boundary_v4_6.md`
+
+## Canonical Contract Reminder
+
+Use `docs/ver4/` for current-state requirements, architecture, schema, and error policy:
+
+- `index_v4.md`
+- `architecture_v4.md`
+- `requirements_v4.md`
+- `schema_v4.md`
+- `error_handling_v4.md`