docs: give the tool surface its own README section

[Steel-tech]

The rest of this branch landed on main as #17 (squash), so this PR is now just its final commit: the README update.

The tool list had grown past the one-liner tucked under Providers — this promotes it to a Tools section with a per-tool table (bash, one-path read_file, write_file/edit_file with hashline patches, grep/glob, agent, job, todo, ask), states the runtime-owned parallel-safety rule, adds the hashline-edit guarantee to "Why it's different", and closes the pen section with the fan-out it all adds up to.

README-only; no code paths touched.

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https://claude.ai/code/session_01KoSjfcJPjXpkVLTS2Vxwwr

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