docs: mention the send-and-close key

[mshddev]

plannotator-tui is adding S to reply review: it sends the review to the agent and closes the window in one key, where today that takes E then q. This updates the one README line that names those keys. E and q are unchanged.

Depends on

• feat(send): close the window after sending with S plannotator-tui#88 adds S. It is open, not merged, and no release carries it.
• The pinned 0.9.2 has no S, so this line would name a key the bundled binary lacks. Draft until plannotator-tui.version moves to a release that has it, the same way feat: add a last-newest review action #48 waited for --newest.

What changed

• README.md: the line under the review key table now says S sends and closes on an agent reply, and that E and q still work.

Nothing else. No action, manifest, binding or version change, because S is typed inside the review window, which this plugin only opens.

Left alone on purpose:

• docs/windows-full-acceptance.md says q quits the TUI in six places. That stays true, and the checklist tests the ConPTY exit path through q specifically.
• skills/plannotator-tui/SKILL.md names no keys, and its flow opens a file review, where S does nothing.
• The manifest descriptions say "send feedback" but name no keys.

Validation

Docs only, so there is nothing to run. Upstream gates S on !is_file_review(), and both folder reviews and Ctrl-clicked files are file reviews, so the line says "agent reply" rather than "review".

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