feat: tx add --dry-run to validate before writing (v0.3.3)

An agent importing rows in a loop could fail mid-batch: a --to account that
didn't exist yet errored after earlier rows had already been written, leaving
a half-applied batch to clean up by hand.

--dry-run resolves --from/--to and infers the type but sends nothing, printing
{"dry_run": true, "would_send": {...}}. A missing account stays a hard error
(exit 1) so the agent can dry-run every row first, create the accounts the
errors name, then run the batch for real. No batch input mode: the agent
already owns the loop.

Verified live read-only: valid accounts emit would_send and write nothing
(search confirms []), missing account exits 1 with the candidate list.

PATCH: new optional flag, contract unchanged.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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