feat(cli): add b2 write — edit a note's body from stdin

[samkeen]

A thin adapter over the existing Vault::write (byte-honest body splice +
re-projection), the CLI/agent counterpart to the desktop editor's save. Reads
the new body from stdin, leaves the frontmatter (b2id, b2_relations:) untouched,
and re-projects the note so index = projection stays live without a reindex.

Model-free like rm and the desktop save. Refuses an interactive terminal so it
never hangs waiting for hand-typed input; a stateless one-shot reads the current
on-disk revision and chains the write on it (no external-edit window to guard —
the content-hash guard is there for the desktop's long-lived buffer).

Closes item 3 of #69 (CLI b2 write).

Co-Authored-By: Claude Opus 4.8 noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_018soWgUw3jvLDH6YYE3HXQA

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• crates/b2-cli/src/main.rs
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