Add e2e build tag to exclude E2E tests from CI

- Add //go:build e2e to all E2E test files
- Update testrunner to use -tags=e2e flag
- E2E tests now only run via 'chu test e2e' command
- CI no longer fails trying to run E2E tests without chu binary

Author: jadercorrea

coverage.txt

@@ -205,7 +205,7 @@ func RunTestsWithProgress(category, backend, profile string, timeout int, notify
 		return fmt.Errorf("test directory not found: %s\n\nAvailable categories: run, chat, tdd, integration", testDir)
 	}
 
-	args := []string{"test", "-v", "-timeout", fmt.Sprintf("%ds", timeout), fmt.Sprintf("./%s/...", testDir)}
+	args := []string{"test", "-tags=e2e", "-v", "-timeout", fmt.Sprintf("%ds", timeout), fmt.Sprintf("./%s/...", testDir)}
 
 	os.Setenv("E2E_BACKEND", backend)
 	os.Setenv("E2E_PROFILE", profile)

internal/testrunner/progress.go

@@ -1,3 +1,5 @@
+//go:build e2e
+
 package chat
 
 import (

tests/e2e/chat/chat_multi_turn_test.go

@@ -1,3 +1,5 @@
+//go:build e2e
+
 package planning
 
 import (

tests/e2e/planning/research_plan_test.go

@@ -1,3 +1,5 @@
+//go:build e2e
+
 package run
 
 import (

tests/e2e/run/chu_chat_test.go

@@ -1,3 +1,5 @@
+//go:build e2e
+
 package run_test
 
 import (

tests/e2e/run/chu_do_symphony_test.go

@@ -1,3 +1,5 @@
+//go:build e2e
+
 package run_test
 
 import (

tests/e2e/run/chu_do_test.go

@@ -1,3 +1,5 @@
+//go:build e2e
+
 package run_test
 
 import (