# Sentinel Linux Converter v1.0.18-9 — Phase 99 Schema and Gate Compatibility Hotfix

## Scope

This is a narrowly scoped Phase 99 correction over v1.0.18-8.

It does **not** modify Sentinel applications, desktop themes, icons, cursors,
GRUB/Plymouth assets, hardening policy, privacy rules, repository policy,
package selection, panel layout, user files or application data.

## Live failure assessed

The repository-owned `sentinelos-release-gate=1.0.0-1` produced a failed
legacy report even though its substantive package, drift, identity, desktop,
repository, timer, dpkg, phase-marker and private-boundary checks passed.

The two transition-era incompatibilities were:

1. its critical-file set predates the package-owned Sentinel Linux name and
   desktop/boot overlays;
2. it treated target-side ISO toolchain availability as part of final ISO
   input readiness, although the conversion contract explicitly states that
   the ISO is built separately and the toolchain is not required on the
   converted target.

The old gate also emitted the obsolete public identifiers:

```text
schema  = org.sentinelos.final_release_report.v1
release = SentinelOS 1.0 AMBROSO
```

## Correction

Phase 99 still runs the signed repository-owned legacy gate as a read-only
source of evidence. It preserves that report, stdout, stderr and evidence in
the Phase 99 directory.

It then independently verifies the current Sentinel Linux package-owned
identity and boot files declared by the converter contracts, verifies that all
substantive legacy checks passed, and emits the canonical evidence as:

```text
schema  = org.sentinellinux.final_release_report.v1
release = Sentinel Linux v1.0 AMBROSO
```

The ISO input schema is:

```text
org.sentinellinux.iso_build_inputs.v1
```

The final release contract schema is:

```text
org.sentinellinux.final_release_contract.v1
```

Unknown or substantive legacy failures are never suppressed. Phase 99 stops
and prints the canonical failure evidence when any required check is false or
when the legacy gate reports more than the two recognised transition
incompatibilities.

## Validation

- Phase 99 schema/contract fixture: PASS
- Exact live-failure compatibility fixture: PASS
- Substantive-failure rejection fixture: PASS
- Phase 7 regression validation: PASS
- Phase 99 full validation: PASS
- Shell syntax: PASS
- No remote payload retrieval: PASS
- No automatic remediation: PASS
- No `apt autoremove`: PASS