Use kit daemon runtime (#578)

## Summary
- replace the custom daemon state-file and PID-lock implementation with go.kenn.io/kit daemon runtime records and start locks
- expose the shared /api/ping liveness endpoint for daemon discovery
- remove obsolete platform-specific boot/process-start stale PID checks and the internal pidlock package

## Validation
- go test ./internal/server ./cmd/agentsview
- go test ./... (fails in existing unrelated internal/parser TestParseWorkBuddySession: expected project `proj`, got `agentsview`)

Co-authored-by: Marius van Niekerk <mariusvniekerk@users.noreply.github.com>

Author: mariusvniekerk

cmd/agentsview/classifier.go

@@ -55,7 +55,7 @@ func newClassifierRebuildCommand() *cobra.Command {
 				return fmt.Errorf("loading config: %w", err)
 			}
 			applyClassifierConfig(cfg)
-			tr, err := detectTransport(cfg.DataDir, 0)
+			tr, err := detectTransport(cfg.DataDir, cfg.AuthToken, 0)
 			if err != nil {
 				return err
 			}
@@ -82,9 +82,9 @@ func guardClassifierRebuild(tr transport) error {
 	}
 	if tr.Mode == transportDirect && tr.DirectReadOnly {
 		return errors.New(
-			"local daemon is active but not responding; " +
-				"refusing to rebuild to avoid competing for " +
-				"write ownership; stop the daemon first",
+			"local daemon owns the SQLite archive but is not responding; " +
+				"refusing to rebuild to avoid competing for write ownership; " +
+				"stop the daemon first",
 		)
 	}
 	return nil

cmd/agentsview/classifier_test.go

@@ -140,7 +140,7 @@ func TestClassifierRebuildRefusesOnDirectReadOnly(t *testing.T) {
 }
 
 func TestClassifierRebuildAllowsDirectWritable(t *testing.T) {
-	tr := transport{Mode: transportDirect, DirectReadOnly: false}
+	tr := transport{Mode: transportDirect}
 	assert.NoError(t, guardClassifierRebuild(tr))
 }