feat(browser_mcp): perceive nativo Go, datos de iframe, click XY y screenshot como imagen (v0.6.0)

Capacidades nuevas y cambios (40 -> 42 tools):

- page_perceive ahora se genera de forma NATIVA en Go sobre la conexion CDP
  viva del pool (cdp_get_ax_outline_go_browser). Elimina el subprocess
  `fn run cdp_perceive_outline` (Python), el venv y la dependencia del binario
  `fn` en runtime (se borra resolveRoot/exec.Command). Respeta tab_select.
- page_perceive acepta frame_id para percibir DENTRO de un iframe. El campo
  tab_id queda obsoleto (se ignora; usar tab_select) pero se conserva por
  compatibilidad.
- frame_get_text (nueva, lectura): innerText de un iframe via
  cdp_get_text_in_frame_go_browser. Activa tambien bajo --read-only.
- dom_click_xy (nueva, MUTA): click humanizado por coordenadas absolutas via
  cdp_click_xy_human_go_browser, con mode human/fast/instant y auto-observe.
  Fallback para actuar sobre lo que el LLM ve en page_screenshot.
- page_screenshot devuelve la imagen como image content
  (cdp_screenshot_bytes_go_browser + mcp.NewToolResultImage) para que el LLM
  vea los pixeles; path pasa a ser opcional (si se da, ademas guarda a disco).
- Auto-observe de las tools *_ref sube su truncado de 4000 a 8000 chars.
- Fix de seguridad documental: todas las descripciones del parametro port que
  decian "Default 9222" (navegador diario del usuario) corregidas a
  "Default 9333" (Chrome aislado del MCP). El codigo ya usaba 9333; la doc era
  falsa y podia inducir al modelo a tocar pestanas de banca/correo.

uses_functions del app.md: +cdp_get_ax_outline, +cdp_get_text_in_frame,
+cdp_screenshot_bytes; -cdp_perceive_outline_py_pipelines.

Verificacion: go build OK, go test OK (4 unit pass, 3 e2e skip gated BMCP_E2E=1),
go vet OK, gofmt limpio, sin "Default 9222" en el codigo.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tools_nav.go

@@ -39,7 +39,7 @@ type tabNavigateArgs struct {
 func tabNavigateTool() mcp.Tool {
 	return mcp.NewTool("tab_navigate",
 		mcp.WithDescription("Navigate the connected tab to a URL via Page.navigate."),
-		mcp.WithNumber("port", mcp.Description("CDP port. Default 9222.")),
+		mcp.WithNumber("port", mcp.Description("CDP port. Default 9333 (Chrome isolated del MCP); usa 9222 explícito solo para adjuntarte al navegador diario.")),
 		mcp.WithString("url", mcp.Required(), mcp.Description("Target URL.")),
 	)
 }
@@ -66,7 +66,7 @@ type tabListArgs struct {
 func tabListTool() mcp.Tool {
 	return mcp.NewTool("tab_list",
 		mcp.WithDescription("List all CDP targets (tabs, iframes, workers) via GET /json. Returns JSON."),
-		mcp.WithNumber("port", mcp.Description("CDP port. Default 9222.")),
+		mcp.WithNumber("port", mcp.Description("CDP port. Default 9333 (Chrome isolated del MCP); usa 9222 explícito solo para adjuntarte al navegador diario.")),
 	)
 }
 
@@ -89,7 +89,7 @@ type tabNewArgs struct {
 func tabNewTool() mcp.Tool {
 	return mcp.NewTool("tab_new",
 		mcp.WithDescription("Open a new tab via PUT /json/new. Returns the new tab's JSON."),
-		mcp.WithNumber("port", mcp.Description("CDP port. Default 9222.")),
+		mcp.WithNumber("port", mcp.Description("CDP port. Default 9333 (Chrome isolated del MCP); usa 9222 explícito solo para adjuntarte al navegador diario.")),
 		mcp.WithString("url", mcp.Description("Optional start URL. Empty = about:blank.")),
 	)
 }
@@ -113,7 +113,7 @@ type tabCloseArgs struct {
 func tabCloseTool() mcp.Tool {
 	return mcp.NewTool("tab_close",
 		mcp.WithDescription("Close a tab by its target ID via GET /json/close/<id>."),
-		mcp.WithNumber("port", mcp.Description("CDP port. Default 9222.")),
+		mcp.WithNumber("port", mcp.Description("CDP port. Default 9333 (Chrome isolated del MCP); usa 9222 explícito solo para adjuntarte al navegador diario.")),
 		mcp.WithString("tab_id", mcp.Required(), mcp.Description("Target ID of the tab to close.")),
 	)
 }
@@ -138,7 +138,7 @@ type tabActivateArgs struct {
 func tabActivateTool() mcp.Tool {
 	return mcp.NewTool("tab_activate",
 		mcp.WithDescription("Bring a tab to the foreground via GET /json/activate/<id>."),
-		mcp.WithNumber("port", mcp.Description("CDP port. Default 9222.")),
+		mcp.WithNumber("port", mcp.Description("CDP port. Default 9333 (Chrome isolated del MCP); usa 9222 explícito solo para adjuntarte al navegador diario.")),
 		mcp.WithString("tab_id", mcp.Required(), mcp.Description("Target ID of the tab to activate.")),
 	)
 }
@@ -184,7 +184,7 @@ type navBackArgs struct {
 func navBackTool() mcp.Tool {
 	return mcp.NewTool("nav_back",
 		mcp.WithDescription("Navigate back in the connected tab's history."),
-		mcp.WithNumber("port", mcp.Description("CDP port. Default 9222.")),
+		mcp.WithNumber("port", mcp.Description("CDP port. Default 9333 (Chrome isolated del MCP); usa 9222 explícito solo para adjuntarte al navegador diario.")),
 	)
 }
 
@@ -207,7 +207,7 @@ type navForwardArgs struct {
 func navForwardTool() mcp.Tool {
 	return mcp.NewTool("nav_forward",
 		mcp.WithDescription("Navigate forward in the connected tab's history."),
-		mcp.WithNumber("port", mcp.Description("CDP port. Default 9222.")),
+		mcp.WithNumber("port", mcp.Description("CDP port. Default 9333 (Chrome isolated del MCP); usa 9222 explícito solo para adjuntarte al navegador diario.")),
 	)
 }
 
@@ -231,7 +231,7 @@ type pageWaitLoadArgs struct {
 func pageWaitLoadTool() mcp.Tool {
 	return mcp.NewTool("page_wait_load",
 		mcp.WithDescription("Block until the page fires the load event (or timeout)."),
-		mcp.WithNumber("port", mcp.Description("CDP port. Default 9222.")),
+		mcp.WithNumber("port", mcp.Description("CDP port. Default 9333 (Chrome isolated del MCP); usa 9222 explícito solo para adjuntarte al navegador diario.")),
 		mcp.WithNumber("timeout_ms", mcp.Description("Max wait in ms. Default 10000.")),
 	)
 }
@@ -260,7 +260,7 @@ type pageWaitIdleArgs struct {
 func pageWaitIdleTool() mcp.Tool {
 	return mcp.NewTool("page_wait_idle",
 		mcp.WithDescription("Block until network activity quiets down (inflight requests reach 0 for a quiet window) or timeout. Immune to DOM-mutating extensions/animations."),
-		mcp.WithNumber("port", mcp.Description("CDP port. Default 9222.")),
+		mcp.WithNumber("port", mcp.Description("CDP port. Default 9333 (Chrome isolated del MCP); usa 9222 explícito solo para adjuntarte al navegador diario.")),
 		mcp.WithNumber("timeout_ms", mcp.Description("Max wait in ms. Default 15000.")),
 	)
 }