docs(redesign): plan gated Phase 5 migrations

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# Redesign traceability
Phase 5 planning: [57-contract change impact](../phase-5/PRESERVATION_IMPACT.md), [navigation migration](../phase-5/NAVIGATION_MIGRATION.md) and [visual evidence protocol](../phase-5/VISUAL_ACCEPTANCE.md). These specify future tests/changes, not implemented preservation. The P4-06 conditional gates remain explicit; no Phase 5 application changes have started.
Successor planning checkpoint: [Phase 3 impact matrix and architecture](../phase-3/PRESERVATION_IMPACT_MATRIX.md). It maps all 57 contracts to proposed destinations/validation, without changing their requirements or claiming implemented/visual parity. The subsequent [P4-01 trace sheet](../phase-4/p4-01/TRACEABILITY.md), [P4-02 named-control/modal record](../phase-4/p4-02/README.md), [P4-03 preview keyboard record](../phase-4/p4-03/README.md), [P4-04 Settings layout/typography record](../phase-4/p4-04/README.md) and [P4-05 table/list density record](../phase-4/p4-05/README.md) link shared foundation changes to regression and representative visual evidence. [P4-06 acceptance](../phase-4/p4-06/README.md) and its [57-row reconciliation](../phase-4/p4-06/PRESERVATION_ACCEPTANCE.md) retain scoped evidence, incomplete checks and affected-migration gates; they do not claim exhaustive preservation or production readiness.
Phase 2 starts at `2d0f131`. The [preservation matrix](PRESERVATION_MATRIX.md) is the stable baseline: **PRES-E01…PRES-A03**, in the original ledger's groups (not one contiguous numeric range). Old references such as C07 remain valid aliases. Subdivide a later workflow with a suffix, for example `PRES-C07.override-reset`; do not reuse an ID or silently change its meaning.