fix(backup): align Host110 runtime manifest staging

docs/proposals/AWOOOI-AG99-H110-BACKUP-RUNTIME-V8.md

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+# AWOOOI Agent99 Host110 Backup Runtime V8
+
+Status: proposed; owner approval required before any production apply.
+
+This artifact supersedes V2 through V7. The V7 candidate, revision, artifact,
+and diff hashes are void for approval. All V5 hashes remain void. Prior refs
+remain immutable audit evidence only; none is production execution authority.
+
+## Scope
+
+- Agent99 runtime bundle: 19 files, guarded by one producer/consumer parity
+  test.
+- Host110 backup payload: 18 files, comprising 17 backup scripts and
+  `backup-health-textfile-exporter.py`.
+- Host110 remote stage: 21 unique basenames, comprising the 18 payload files,
+  the fixed executor, the independent verifier, and `manifest.json`.
+- Fixed target: `wooo@192.168.0.110`, dispatched by Windows99 Agent99 from an
+  exact Gitea main revision and digest manifest.
+- Gitea offline backup and container lifecycle changes remain excluded.
+  `backup-gitea.sh` has no candidate diff.
+
+## V7 Defect Closed
+
+V7 created and uploaded
+`agent99-host110-backup-runtime-manifest.json`, while the fixed Host110
+executor consumed `$SOURCE_STAGE/manifest.json`. V8 uses `manifest.json` at
+the broker source stage, so SCP preserves the exact basename consumed by the
+executor.
+
+The integration test derives all broker SCP basenames from the actual
+PowerShell file list and manifest path, requires 21 unique stage files, and
+matches the manifest and verifier basenames to the executor's exact
+`$SOURCE_STAGE` paths. A hand-built temporary manifest cannot satisfy this
+test by itself.
+
+## Exact Diff Serialization
+
+Substitute the V8 Gitea live-ref SHA for `<candidate_git_sha>` and hash the
+exact stdout bytes from this command:
+
+```sh
+git diff --binary --full-index \
+  e7e3bcf8a5a8a19c1253d73f51d9dca248af0aa3..<candidate_git_sha> |
+  shasum -a 256
+```
+
+The review message independently binds the Gitea live ref and Git SHA, this
+tracked artifact path and bytes hash, and the serialized diff hash.
+
+## Apply Effects
+
+- Windows99 Agent99 runtime promotion writes the 19 runtime files plus bounded
+  manifest and receipt state.
+- Host110 Apply writes/replaces the 18 payload paths through one exclusive,
+  digest-bound filesystem transaction.
+- Apply does not run a backup, invoke a Gitea container lifecycle, sync Google
+  Drive, prune or delete snapshots, restart a VM or service, or change a DB,
+  network, or firewall.
+
+## Validation
+
+- The exact broker/SCP basename to executor path integration test must pass.
+- Focused runtime, broker, backup, parity, and Ansible suites must pass.
+- Ansible and shell/Python static validation must pass.
+- Changed PowerShell must parse on Windows99 with zero errors.
+- Central review must independently reproduce the live ref, artifact hash,
+  diff hash, 19/18/21 counts, and zero `backup-gitea.sh` diff.
+
+## Rollback
+
+- Source rollback reverts the exact V8 diff to
+  `e7e3bcf8a5a8a19c1253d73f51d9dca248af0aa3` without force-pushing.
+- Agent99 rollback restores the prior runtime files and manifest and verifies
+  the prior hashes independently.
+- Host110 rollback restores every prior payload's content, SHA-256, uid, gid,
+  and mode under the exclusive lock.
+- Any mismatch terminates as `rollback_unverified` and cannot be reported as a
+  successful rollback.