fix(cli-registry): declare Copilot's wheelForward

The entry inherited wheelForward never from agentDefaults() while _shouldForwardWheelToApp forwards Copilot's wheel whenever the CLI tracks the mouse, at any version. New always mode, set on copilot, pinned by a registry test.

src/config/cli-registry/schema.ts

@@ -295,7 +295,7 @@ const capabilitiesSchema = z
     altScreen: z.enum(['strip-full', 'strip-mux-only', 'strip-mux-and-mouse', 'preserve']),
     echo: echoSchema,
     wheelForward: z
-      .object({ mode: z.enum(['never', 'version-gated']), minVersion: z.string().max(20).optional() })
+      .object({ mode: z.enum(['never', 'version-gated', 'always']), minVersion: z.string().max(20).optional() })
       .strict(),
     // Whether a hollow pane's wheel/touch scroll may be turned into PageUp/PageDown for
     // the CLI to page its own transcript. Distinct from wheelForward (SGR reports).

src/config/cli-registry/stock.ts

@@ -1758,6 +1758,9 @@ const COPILOT: CliEntry = {
     // (`cliMouseTracking`). Same shape and reason as opencode. The wheel keeps working because
     // `_shouldForwardWheelToApp` forwards it as SGR reports while the CLI is tracking.
     altScreen: 'strip-mux-and-mouse',
+    // Forwards the wheel as SGR reports while the CLI is tracking the mouse, at any version
+    // (`_shouldForwardWheelToApp` in terminal-ui.js has no version check for copilot).
+    wheelForward: { mode: 'always' },
     // Pages its own transcript on PageUp/PageDown (1.0.95, measured in tmux: three PageUp moved
     // lines 109-140 to 010-042 and PageDown returned). This is the fallback when the
     // wheel-forward flag is stale after a server restart, so the wheel and a swipe never go dead.

src/config/cli-registry/types.ts

@@ -539,8 +539,12 @@ export interface CliCapabilities {
     /** Names a PREDICT_PROFILES key. Unknown or absent degrades to 'buffer', never to broken. */
     predictProfile?: string;
   };
-  /** Forwarding the wheel to the CLI's own transcript. 'never' keeps local scrollback. */
-  wheelForward: { mode: 'never' | 'version-gated'; minVersion?: string };
+  /**
+   * Forwarding the wheel to the CLI's own transcript. 'never' keeps local scrollback;
+   * 'version-gated' forwards from `minVersion` on; 'always' forwards at any version. Either
+   * forwarding mode applies only while the CLI has mouse tracking on (`cliMouseTracking`).
+   */
+  wheelForward: { mode: 'never' | 'version-gated' | 'always'; minVersion?: string };
   /**
    * The CLI pages its OWN transcript on PageUp/PageDown, so a wheel or touch scroll over
    * a pane with no local history can be turned into those keys instead of doing nothing

test/cli-registry-schema.test.ts

@@ -485,6 +485,19 @@ describe('capability shapes', () => {
     }, 'transcriptPageKeys is a boolean');
   });
 
+  it('declares which CLIs get the wheel forwarded, and whether a version gates it', () => {
+    // claude forwards from 2.1.187 (fullscreen renderer only); copilot forwards at any version while
+    // it tracks the mouse. codex ignores SGR wheel reports, so every other entry stays 'never'.
+    const mode = (id: string) => STOCK_CLIS.find((e) => (e.id as string) === id)?.capabilities.wheelForward;
+    expect(mode('copilot')).toEqual({ mode: 'always' });
+    expect(mode('claude')).toEqual({ mode: 'version-gated', minVersion: '2.1.187' });
+    const forwarding = STOCK_CLIS.filter((e) => e.capabilities.wheelForward.mode !== 'never').map(
+      (e) => e.id as string
+    );
+    expect(forwarding.sort()).toEqual(['claude', 'copilot']);
+    expect(CliEntrySchema.safeParse(baseEntry('copilot')).success).toBe(true);
+  });
+
   it('declares transcriptPageKeys for exactly the CLIs measured to page on PageUp/PageDown', () => {
     // claude (repaint mode), codex, opencode and copilot (all on the alternate screen) were
     // measured paging their own transcript on PageUp/PageDown; no other stock entry has been.