ellie.el:
- Preserve tree selection and cursor across tree rerenders.
- Keep chat cursor stationary; only update when already at end.
- Guard chat-filter against stale output from replaced ollie-9p read processes.
- Render [[[name]]] markers as bold underlined block headers; suppress [[[end]]].
- Refresh session/idx and start timer on startup so tree displays immediately.
- Fix Active/Inactive header tuple layout (was missing 'nil' slot).
- Bind TAB for tree expand/collapse, C-c C-SPC and C-c C-p for prompt input,
SPC in chat for prompt, q in chat for quit (stops stream + buries buffer).
- RET on an agent now opens the chat buffer.
- Prompt input window selects and focuses itself after opening.
doc/ellie.md:
- Embed ellie screenshot (img/ellie.png) centered at 75% width above Session tree.
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