docs(metadata): clarify scalar rewrite and config command errors

[hyperpolymath]

Carries forward the one commit of #47 that is not already on main.

Why this exists

Four of #47's five commits landed via the #46 squash (552ecf4). Only
4cac602 carried content that is still absent from main, so rather than
force-push over CodeRabbit's branch or discard the work, that single commit is
cherry-picked here with -x. Authorship is preserved — the commit is still
authored by coderabbitai[bot]; this session signs only as committer.

What it changes

Documentation only. No behaviour change, no test change. Two files, +12 -5.

Every claim in the new doc comments was verified against main at 552ecf4
before being carried, rather than taken on the original PR's word:

documented error path	verified against
refuses the read-only DEED dialect	if block.is_deed() { bail! }
new_value inserted verbatim, no escaping	rewritten.push_str(new_value)
key absent, or names a list	the two bail!s above the scan
parsed but not safely locatable	if !patched { bail! }

The pre-existing docstring named only two of those five error paths, so this is
a correctness fix to the documentation, not a rewording.

Verification

• cargo test --workspace — 84 passed, 0 failed (73 unit + 5 deed_corpus
  • 6 round_trip).
• Subject line trimmed to 64 chars; the bot's original was 73, one over the
  estate's 72-char threshold.
• Commit is signed (%G? = G).

Closes #47.

🤖 Generated with Claude Code

https://claude.ai/code/session_01WPSJ7fBhVAMcpSffCBWUDo

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📥 Commits

Reviewing files that changed from the base of the PR and between 552ecf4 and f1065a7.

📒 Files selected for processing (2)

• crates/launcher-common/src/metadata_block.rs
• crates/launcher/src/cmd_config.rs

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