NEXT_STEPS item 3 needed solid archive handling to be a deliberate
contract instead of an incidental RAR header attribute. Add a tiny real
solid RAR fixture and S41 to the extended peer-cli scenarios so the
Docker harness proves this path end to end.
The scenario verifies the source archive with container-bundled
`unrar lt`, streams the install with the injected provider, and then
asserts the receiver is installed local-only without a root archive or
root `version.ini`. It also compares local payload SHA-256 hashes against
`unrar p` output and checks the streamed byte count matches the extracted
entries. This keeps the existing one metadata pass plus one sequential
payload pass contract covered for solid archives.
Test Plan:
- just fmt
- just test
- python3 -m py_compile crates/lanspread-peer-cli/scripts/run_extended_scenarios.py
- python3 crates/lanspread-peer-cli/scripts/run_extended_scenarios.py S41 --build-image
- python3 crates/lanspread-peer-cli/scripts/run_extended_scenarios.py S41
- git diff --check
- git diff --cached --check
Refs: NEXT_STEPS.md item 3
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