TDS GUARANTEED STORAGE — PHASE 8 STATUS
Version: staqtapp TDS v3.5.3-dev8
Feature: Verified Round-Trip Migration

IMPLEMENTED

Legacy Mount
    -> isolated exact snapshot
    -> immutable guaranteed generation
    -> private materialised mount
    -> equivalence qualification
    -> atomic destination publication

PROVEN GATES

- identical path inventory
- no missing files
- no unexpected files
- identical byte lengths
- identical SHA-256 digests
- structured metadata equivalence for manifest and .tds.meta documents
- logical reopen equivalence for every .tds file
- legacy source unchanged before, during, and after migration
- activation eligibility false unless every gate passes
- requested destination remains absent on qualification failure
- prior CURRENT generation restored if post-commit equivalence fails

NEW PUBLIC TYPES

- MigrationFileRecord
- VerifiedMigrationReport

NEW API

GuaranteedStorageBridge.verify_round_trip(legacy_mount, destination)

QUALIFICATION COMPLETED IN THIS ENVIRONMENT

66 passed / 0 failed across:
- Phase 8 dedicated migration suite
- Guaranteed Storage transition suite
- Materialisation Fault Qualification suite
- Buffer streaming hardening suite
- Immutable generation suite
- Persistence policy contract suite
- Recovery state-machine suite
- Retention and cleanup suite

The separate exhaustive fault-injection recovery file exceeded the execution
window after continued passing progress. No failure was observed, but it is not
counted as completed qualification in this status.

ENGINEERING INVARIANT

Before equivalence proof:
No requested destination is published and activation remains prohibited.

After equivalence proof:
The destination is an exact, reopenable, metadata-equivalent reconstruction of
an unchanged legacy source, and the structured report records every gate.
