v0.0.12

:bookmark: prepare v0.0.12 with application audit fixes (#24)

## What does this change?

Prepare v0.0.12 by updating the application version in Cargo.toml and
Cargo.lock and incorporating the application audit fixes on this branch.

- Strengthen typed invariants for history windows, shard depths, file
transfers, journal replay, and reconciliation.
- Fix rollback and recovery behavior for moves, materialization, cache
cleanup, and lock reshaping; preserve overlapping and Unicode
materialized paths.
- Harden filesystem and Git integration against symlink and
concurrent-update edge cases.
- Consolidate comparison, path construction, encoding, and validation
logic; reduce redundant allocations, database reads, and transfer
buffering.
- Add regression coverage for the corrected failure paths and boundary
cases.

## Checklist

- [x] `task check` passes locally (fmt, clippy, architecture, policy
checks, unit/integration tests, and doctests).
- [x] No CLI command or configuration documentation changes required for
the version bump.
- [x] Regression tests accompany the audit fixes; no additional tests
needed for the version-only change.

Installer checks were excluded at the user's request. No Markdown files
are included. Publishing a release tag is outside this PR.