Refactor code structure for improved readability and maintainability; removed redundant code blocks and optimized function calls.

docs/modules/mirror/thin-bundle-assembler.md

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+# MIRROR-CRT-56-001 · Thin bundle assembler handoff (v0.1)
+
+Purpose: unblock MIRROR-CRT-56-001 by defining expected assembler outputs so the real thin bundle can replace the milestone-0 sample.
+
+## Expected outputs
+- Artifact: `out/mirror/thin/mirror-thin-v1.tar.gz`
+- Manifest: `out/mirror/thin/mirror-thin-v1.manifest.json` containing:
+  - `version`: "1.0.0"
+  - `created`: UTC ISO-8601
+  - `layers`: array of `{ digest, size, path }`
+  - `indexes`: array of `{ name, digest }` for evidence/linkset indexes
+  - `hashes`: `{ tarball_sha256, manifest_sha256 }`
+- Checksums: `.sha256` files for tarball and manifest stored alongside artifacts.
+
+## Assembly steps (reference for assembler owners)
+1) Produce layer tar parts deterministically (sorted entries, zeroed mtimes/uid/gid, pax headers disabled).
+2) Compose `mirror-thin-v1.tar.gz` using stable order: `manifest.json`, `layers/*`, `indexes/*`.
+3) Generate manifest JSON and compute SHA256 for both tarball and manifest; write `.sha256` files.
+4) Sign manifest (DSSE optional) and place signature next to manifest if available.
+
+## Determinism requirements
+- POSIX tar with numeric owner 0:0, mtime 0, sorted paths.
+- Gzip with `--no-name` and fixed timestamp 0.
+- No duplicate files; symlinks forbidden.
+
+## Evidence
+- When produced, place artefacts under `out/mirror/thin/` and add hashes to this doc.
+
+## Owners
+- Mirror Creator Guild (assembler)
+- AirGap Guild (consumer)
+
+## Status
+- Handoff doc published 2025-11-19; awaiting assembler output to replace milestone-0 sample.