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Add a new `bootc container compute-composefs-digest` command that computes the bootable composefs digest directly from a filesystem directory path, defaulting to `/target`. This enables computing digests in container environments without requiring access to container storage or a booted host system. The existing container-storage-based behavior is preserved and renamed to `compute-composefs-digest-from-storage` (hidden). The `hack/compute-composefs-digest` script is updated to use the renamed command. The core digest computation logic is extracted into a new `bootc_composefs::digest` module with: - `new_temp_composefs_repo()` helper for DRY temp repository creation - `compute_composefs_digest()` function with "/" path rejection Unit tests and an integration test verify the command works correctly, producing valid SHA-512 hex digests with consistent results across multiple invocations. Exact digest values are not asserted due to environmental variations (SELinux labels, timestamps, etc.). Closes: https://github.com/bootc-dev/bootc/issues/1862 Assisted-by: OpenCode (Claude Opus 4.5) Signed-off-by: John Eckersberg <jeckersb@redhat.com>