snapdir-cli 1.8.0

snapdir CLI implementation: the library behind the `snapdir` binary (which ships in the `snapdir` crate).
Documentation 
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```
$ snapdir diff --help
Compare two sides, each a set of manifests, reporting file-level differences — reading MANIFESTS ONLY

Usage: snapdir diff [OPTIONS]

Options:
      --id <ID>
          Pin each side to this single manifest id (else the whole store is unioned)

  -q, --quiet
          Suppress stderr banners and the live progress line

      --color <WHEN>
          When to colorize progress output: auto, always, or never

          Possible values:
          - auto:   Color when attached to a TTY and `NO_COLOR` is unset (default)
          - always: Always emit color
          - never:  Never emit color
          
          [default: auto]

      --from <REF>
          FROM-side ref: a manifest-store URI (enumerated) and/or, with `--id`, a single pinned manifest. Repeatable; refs are UNIONED into the FROM side

      --no-progress
          Disable the live progress line (transfers still run)
          
          [env: SNAPDIR_NO_PROGRESS=]

      --to <REF>
          TO-side ref: a manifest-store URI (enumerated) and/or a pinned manifest. Repeatable; refs are UNIONED into the TO side

      --all
          Also emit unchanged (equal) paths

      --verbose
          Enable verbose output. Honored by the transfer commands (push/fetch/pull/checkout/stage/sync emit an effective-config banner and CACHED/SAVED notices) and verify-cache (purge notices); inert elsewhere

      --json
          Emit a JSON array of `{status, path}` objects instead of porcelain

      --exit-code
          Exit 1 when any difference is found (git `diff --exit-code` semantics); the default exits 0 regardless

      --on-conflict <POLICY>
          Policy for an intra-side path collision (same path, differing content unioned on one side)

          Possible values:
          - error:     A differing-content collision is a hard error (default)
          - last-wins: The last ref contributing the path wins
          
          [default: error]

  -h, --help
          Print help (see a summary with '-h')

  -V, --version
          Print version

```