docs(commands): add tool-availability and ceremony scale to start-work

Two audit fixes. A "Tool availability" section degrades gracefully when Linear MCP, gh, /voice, or Playwright are missing: do what the available tools allow, surface what couldn't run, don't fail the phase. A "Ceremony scale" section sizes the process to the work, so a trivial fix skips the ticket, branch, and gates unless asked. Separately, the claim now splits by tracker: personal todo claims wait until after the Justify gate (no rollback needed if killed), while Linear and GitHub claims happen first to signal intent but record prior state so a killed task restores cleanly.

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