feat(domains): migrate browser_click to defineBrowserTool — vertical slice

Implements Task 9: adds src/domains/click.ts with the new architecture,
updates registry.ts to register clickTool, removes the legacy browser_click
block from tools.ts, and wires BrowserClient alongside BrowserDaemon in
index.ts so both systems coexist during migration.

Also fixes AnyBrowserToolDefinition variance: uses never-arg renderCall in
the erased type and a boundary cast in registerBrowserTool so concrete tool
definitions (with specific Static<S> args) are assignable to the registry
array without widening.

1 files changed, 0 insertions, 77 deletions

diff --git a/src/tools.ts b/src/tools.ts
index 3ea0b54..134531c 100644
--- a/src/tools.ts
+++ b/src/tools.ts
@@ -319,83 +319,6 @@ export function registerTools(pi: ExtensionAPI, daemon: BrowserDaemon): void {
   });
 
   // ═══════════════════════════════════════════════════════════════════════════
-  // browser_click
-  // ═══════════════════════════════════════════════════════════════════════════
-  pi.registerTool({
-    name: "browser_click",
-    label: "Browser Click",
-    description:
-      "Click at viewport CSS-pixel coordinates. Compositor-level click works through iframes, shadow DOM, and cross-origin content. Use browser_screenshot first to find coordinates.",
-    promptSnippet: "Click at pixel coordinates (x, y) on the page",
-    promptGuidelines: [
-      "Use browser_click for all clicks. Coordinates are viewport CSS pixels (not device pixels).",
-      "Capture a browser_screenshot BEFORE clicking to find the right coordinates.",
-      "Capture another browser_screenshot AFTER clicking to verify the action worked.",
-      "Compositor-level clicks pass through iframes, shadow DOM, and cross-origin content — no selector needed.",
-      "If a click doesn't register, try setting BH_DEBUG_CLICKS=1 to get annotated screenshots showing exact click positions.",
-      "For React/Vue components that don't respond to clicks, try browser_dispatch_key to send DOM-level events.",
-    ],
-    parameters: Type.Object({
-      x: Type.Number({ description: "X coordinate in CSS pixels from left edge of viewport" }),
-      y: Type.Number({ description: "Y coordinate in CSS pixels from top edge of viewport" }),
-      button: Type.Optional(Type.String({ description: 'Mouse button: "left", "right", or "middle". Default: "left"' })),
-      clicks: Type.Optional(Type.Number({ description: "Number of clicks (1 = single, 2 = double). Default: 1" })),
-    }),
-    async execute(_id, params) {
-      try {
-        await daemon.ensureAlive();
-        await daemon.cdp("Input.dispatchMouseEvent", {
-          type: "mousePressed",
-          x: params.x,
-          y: params.y,
-          button: params.button || "left",
-          clickCount: params.clicks || 1,
-        });
-        await daemon.cdp("Input.dispatchMouseEvent", {
-          type: "mouseReleased",
-          x: params.x,
-          y: params.y,
-          button: params.button || "left",
-          clickCount: params.clicks || 1,
-        });
-
-        // Debug click overlay (when BH_DEBUG_CLICKS is set)
-        if (process.env.BH_DEBUG_CLICKS) {
-          try {
-            const debugPath = nextScreenshotPath();
-            await daemon.captureScreenshotWithDebugOverlay(
-              debugPath,
-              params.x,
-              params.y,
-            );
-            return {
-              content: [{
-                type: "text" as const,
-                text: `Clicked at (${params.x}, ${params.y})\n[DEBUG] Overlay screenshot: ${debugPath}`,
-              }],
-              details: { debugScreenshotPath: debugPath },
-            };
-          } catch {
-            // Overlay failed — still report the click
-          }
-        }
-
-        return { content: [{ type: "text" as const, text: `Clicked at (${params.x}, ${params.y})` }], details: undefined };
-      } catch (err) {
-        return {
-          isError: true,
-          content: [{ type: "text" as const, text: `Click failed: ${err instanceof Error ? err.message : String(err)}` }],
-          details: undefined,
-        };
-      }
-    },
-    renderCall(args, theme) {
-      const { x, y } = args as { x: number; y: number };
-      return new Text(`🖱️ Click at (${x}, ${y})`, 0, 0);
-    },
-  });
-
-  // ═══════════════════════════════════════════════════════════════════════════
   // browser_type
   // ═══════════════════════════════════════════════════════════════════════════
   pi.registerTool({