feat(config): send_command and the [compose] section, item 123

An account's ability to send IS its send_command's presence. Not a separate
receive_only key: with one key there is nothing to keep in step and nothing
to contradict, and a receive-only account is expressed by omission, which is
how one real account here is meant to work.

Startup validation follows the startup_query pattern, and is deliberately
asymmetric. A default_account that cannot send is warned about, because the
user named an account and expects mail to come from it. An installation
where NO account can send is not: that is a valid read-only installation,
and warning about it would train the user to ignore warnings.

Every [compose] key reads through value(key, default) rather than testing
contains(), because send_delay_ms = 0 is a real setting meaning 'send at
once' that a zero-test would mistake for unset.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015muoUo2GdxmBDSp5vjYcbE

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