chore: remove dead test and script files

Dead-code sweep via knip. All files below have zero importers and were
leftovers from the local-echo overlay exploration or duplicated by files
under test/mocks/.

Deleted:
- test/respawn-test-utils.ts (728-line duplicate of test/mocks/*)
- test/input-echo-test.mjs
- test/local-echo-*.mjs (7 files)
- test/manual/*.mjs (10 files; dir removed)
- scripts/remotion/components/TerminalScreen.tsx (unused Remotion demo)

Also cleaned stale JSDoc references to the removed
respawn-test-utils.ts in test/mocks/mock-session.ts and
test/mocks/test-helpers.ts.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/remotion/components/TerminalScreen.tsx

@@ -1,117 +0,0 @@
-import React from 'react';
-import { useCurrentFrame } from 'remotion';
-import { colors, fonts } from '../lib/theme';
-
-type OverlayChar = {
-  char: string;
-  confirmed: boolean;
-};
-
-type TerminalScreenProps = {
-  typed: string;
-  cursorVisible: boolean;
-  overlayChars?: OverlayChar[];
-  fontSize?: number;
-};
-
-/**
- * Renders a terminal area styled exactly like the real Codeman xterm.js terminal.
- * Background #0d0d0d, Fira Code font, block cursor, Claude Code prompt.
- */
-export const TerminalScreen: React.FC<TerminalScreenProps> = ({
-  typed,
-  cursorVisible,
-  overlayChars,
-  fontSize = 28,
-}) => {
-  const frame = useCurrentFrame();
-
-  // Block cursor — solid, no blink (matches Codeman's cursorBlink: false)
-  const cursorOn = cursorVisible;
-  // But add a subtle blink for video clarity so viewers notice it
-  const cursorOpacity = cursorOn ? (Math.floor(frame / 20) % 2 === 0 ? 0.9 : 0.6) : 0;
-
-  const lineHeight = Math.round(fontSize * 1.35);
-  const charWidth = fontSize * 0.6;
-
-  return (
-    <div
-      style={{
-        width: '100%',
-        height: '100%',
-        background: '#0d0d0d',
-        position: 'relative',
-        fontFamily: '"Fira Code", "Cascadia Code", "JetBrains Mono", "SF Mono", Monaco, monospace',
-        overflow: 'hidden',
-      }}
-    >
-      {/* Previous terminal output lines (fake history for realism) */}
-      <div
-        style={{
-          padding: '16px 20px',
-          fontSize: fontSize * 0.65,
-          lineHeight: `${Math.round(fontSize * 0.65 * 1.4)}px`,
-          color: '#495057',
-        }}
-      >
-        <div>
-          <span style={{ color: '#339af0' }}>❯</span>
-          <span style={{ color: '#495057' }}> claude --dangerously-skip-permissions</span>
-        </div>
-        <div style={{ color: '#3a3a3a', marginTop: 4 }}>
-          ╭────────────────────────────────────╮
-        </div>
-        <div style={{ color: '#3a3a3a' }}>
-          │ Claude Code session active         │
-        </div>
-        <div style={{ color: '#3a3a3a' }}>
-          ╰────────────────────────────────────╯
-        </div>
-      </div>
-
-      {/* Active prompt line — this is where the typing happens */}
-      <div
-        style={{
-          padding: '8px 20px',
-          fontSize,
-          lineHeight: `${lineHeight}px`,
-          display: 'flex',
-          alignItems: 'baseline',
-        }}
-      >
-        {/* Prompt character */}
-        <span style={{ color: '#339af0', fontWeight: 700, marginRight: charWidth * 0.8 }}>❯</span>
-
-        {/* Typed text */}
-        {overlayChars ? (
-          // Zerolag mode: show overlay chars with confirmed/unconfirmed color
-          overlayChars.map((oc, i) => (
-            <span
-              key={i}
-              style={{
-                color: oc.confirmed ? '#e0e0e0' : '#7a7a7a',
-                letterSpacing: '0.5px',
-              }}
-            >
-              {oc.char}
-            </span>
-          ))
-        ) : (
-          <span style={{ color: '#e0e0e0', letterSpacing: '0.5px' }}>{typed}</span>
-        )}
-
-        {/* Block cursor */}
-        <span
-          style={{
-            display: 'inline-block',
-            width: charWidth,
-            height: lineHeight * 0.85,
-            background: `rgba(224, 224, 224, ${cursorOpacity})`,
-            verticalAlign: 'text-bottom',
-            marginLeft: 1,
-          }}
-        />
-      </div>
-    </div>
-  );
-};