fix(ci): resolve lint errors and test failures

- Fix errcheck: handle watcher.Close() and Set() return values
- Fix unparam: remove always-nil error from NewActivityWatcher
- Fix unparam: remove unused sinceTime param, delete dead code
- Fix version mismatch: update MCP __init__.py to 0.48.0
- Fix routing tests: change CWD so routing can find town root

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

cmd/bd/agent_routing_test.go

@@ -12,6 +12,8 @@ import (
 // TestAgentStateWithRouting tests that bd agent state respects routes.jsonl
 // for cross-repo agent resolution. This is a regression test for the bug where
 // bd agent state failed to find agents in routed databases while bd show worked.
+//
+// NOTE: This test uses os.Chdir and cannot run in parallel with other tests.
 func TestAgentStateWithRouting(t *testing.T) {
 	ctx := context.Background()
 
@@ -73,6 +75,16 @@ func TestAgentStateWithRouting(t *testing.T) {
 	dbPath = townDBPath
 	t.Cleanup(func() { dbPath = oldDbPath })
 
+	// Change to tmpDir so routing can find town root via CWD
+	oldWd, err := os.Getwd()
+	if err != nil {
+		t.Fatalf("Failed to get working directory: %v", err)
+	}
+	if err := os.Chdir(tmpDir); err != nil {
+		t.Fatalf("Failed to change to temp directory: %v", err)
+	}
+	t.Cleanup(func() { _ = os.Chdir(oldWd) })
+
 	// Test the routed resolution
 	result, err := resolveAndGetIssueWithRouting(ctx, townStore, "gt-testrig-polecat-test")
 	if err != nil {
@@ -115,6 +127,8 @@ func TestNeedsRoutingFunction(t *testing.T) {
 }
 
 // TestAgentHeartbeatWithRouting tests that bd agent heartbeat respects routes.jsonl
+//
+// NOTE: This test uses os.Chdir and cannot run in parallel with other tests.
 func TestAgentHeartbeatWithRouting(t *testing.T) {
 	ctx := context.Background()
 
@@ -167,6 +181,16 @@ func TestAgentHeartbeatWithRouting(t *testing.T) {
 	dbPath = townDBPath
 	t.Cleanup(func() { dbPath = oldDbPath })
 
+	// Change to tmpDir so routing can find town root via CWD
+	oldWd, err := os.Getwd()
+	if err != nil {
+		t.Fatalf("Failed to get working directory: %v", err)
+	}
+	if err := os.Chdir(tmpDir); err != nil {
+		t.Fatalf("Failed to change to temp directory: %v", err)
+	}
+	t.Cleanup(func() { _ = os.Chdir(oldWd) })
+
 	// Test that we can resolve the agent from the town directory
 	result, err := resolveAndGetIssueWithRouting(ctx, townStore, "gt-test-witness")
 	if err != nil {
@@ -189,6 +213,8 @@ func TestAgentHeartbeatWithRouting(t *testing.T) {
 }
 
 // TestAgentShowWithRouting tests that bd agent show respects routes.jsonl
+//
+// NOTE: This test uses os.Chdir and cannot run in parallel with other tests.
 func TestAgentShowWithRouting(t *testing.T) {
 	ctx := context.Background()
 
@@ -241,6 +267,16 @@ func TestAgentShowWithRouting(t *testing.T) {
 	dbPath = townDBPath
 	t.Cleanup(func() { dbPath = oldDbPath })
 
+	// Change to tmpDir so routing can find town root via CWD
+	oldWd, err := os.Getwd()
+	if err != nil {
+		t.Fatalf("Failed to get working directory: %v", err)
+	}
+	if err := os.Chdir(tmpDir); err != nil {
+		t.Fatalf("Failed to change to temp directory: %v", err)
+	}
+	t.Cleanup(func() { _ = os.Chdir(oldWd) })
+
 	// Test that we can resolve the agent from the town directory
 	result, err := resolveAndGetIssueWithRouting(ctx, townStore, "gt-myrig-crew-alice")
 	if err != nil {