Stop deploy stripping the execute bit from site binaries

The permission step ran

    find ${SITE_DIR} -type f -exec chmod 644 {} +
    chmod +x ${SITE_DIR}/app

over the whole site directory, so it cleared +x on every other executable there
and restored it only for doot's own app. Four binaries were caught:

    services/scout/app      scout.service
    services/hawaii/app     hawaii sub-service
    bin/claudomator         claudomator@doot.terst.org.service
    bin/claude              exec'd by claudomator via --claude-bin

Nothing appears to break at deploy time: a running service keeps executing from
its already-open file. The damage surfaces at the next reboot, when systemd
cannot exec the binary and the unit dies with status=203/EXEC. scout.service
went down that way at the 2026-08-25 reboot and stayed down three and a half
weeks, serving 502s behind /scout/; claudomator has been crash-looping on the
same error, 426k restarts and counting. Neither is alerted on, because doot
itself is healthy and only those paths fail.

Permission fixing is now scoped to the directories this script actually manages
(public, templates, migrations) plus doot's own binary and .env. Every
executable under services/*/app and bin/* is then re-asserted +x, since that is
what an outage looks like when it is wrong and asserting it is free.

Verified against a synthetic site tree: all five binaries keep 755, assets 644.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B

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