docs: sweep for the worker-only reality (drop mcp supervisor/spawn.sh/--db)

* RPC.md: the TUI is launched via `./ida-tui <bin> --rpc <sock>` (was
  `idatui.tui --db`); point the "regression lock" note at rpcclient/drive +
  the pilot instead of the deleted rpc_smoke.py.
* PAGING_FINDINGS.md: reframe the intro as the ida-pro-mcp tool functions the
  worker now calls in-process (shapes/caps unchanged); replace the
  supervisor-era "idle self-exit" + "max_workers cap" sections with the
  single-owned-worker lifecycle (no cap, no idle-exit, crash -> reconnect).
* TEXTUAL_NOTES.md / TUI_DRIVING_BLUEPRINT.md: drop the ida-pro-mcp framing and
  the deleted rpc_smoke.py references (-> test_scenarios.py / rpcclient).

Also updated the idatui + idatui-rpc skills (in ~/.pi, outside the repo) to the
worker model: no supervisor/spawn.sh/--db, worker python + $IDATUI_WORKER_PYTHON,
worker.py/worker_client.py/errors.py architecture, and the load-starvation gotcha.

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