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* fix(runtime): throw a descriptive error when raw mode is unsupported (Ink parity, G10) Previously the raw-mode acquire path silently no-opped on a stdin where raw mode is unsupported (non-TTY / isRawModeSupported false), so using useInput on such a stdin did nothing with no diagnostic. Ink's handleSetRawMode (App.tsx:315-327) instead throws immediately when enabling raw mode is unsupported, with two distinct messages (default process.stdin vs a custom stdin) both pointing at the isRawModeSupported docs. StdinController.acquireRawMode now throws that two-message error on !isRawModeSupported. The unguarded useInput path surfaces it (matching Ink's use-input.ts, which calls setRawMode(true) ungated). useFocus now guards on isRawModeSupported before acquiring (matching Ink's use-focus.ts), so focus degrades to a safe no-op on a non-TTY rather than throwing. releaseRawMode keeps its no-op guard — Ink only throws when enabling. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * chore(parity): ledger — G10 pr-open, reconcile G09 merged Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * test(runtime): assert full raw-mode error message for exact Ink parity (G10, codex) Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>