Remove version field from metadata.json

- Removes noisy version mismatch warnings on every bd upgrade
- Version field in metadata.json was redundant with daemon version checking via RPC
- Daemon version mismatches still detected via HealthResponse
- Removes checkVersionMismatch() function and related test file
- Updates .beads/.gitignore to properly ignore merge artifacts

Amp-Thread-ID: https://ampcode.com/threads/T-7ba8aff2-97a0-4d0c-9008-e858bdfadd61
Co-authored-by: Amp <amp@ampcode.com>

internal/configfile/configfile.go

@@ -11,14 +11,12 @@ const ConfigFileName = "metadata.json"
 
 type Config struct {
 	Database     string `json:"database"`
-	Version      string `json:"version"`
 	JSONLExport  string `json:"jsonl_export,omitempty"`
 }
 
-func DefaultConfig(version string) *Config {
+func DefaultConfig() *Config {
 	return &Config{
 		Database:    "beads.db",
-		Version:     version,
 		JSONLExport: "beads.jsonl",
 	}
 }

internal/configfile/configfile_test.go

@@ -7,16 +7,12 @@ import (
 )
 
 func TestDefaultConfig(t *testing.T) {
-	cfg := DefaultConfig("0.17.5")
+	cfg := DefaultConfig()
 	
 	if cfg.Database != "beads.db" {
 		t.Errorf("Database = %q, want beads.db", cfg.Database)
 	}
 	
-	if cfg.Version != "0.17.5" {
-		t.Errorf("Version = %q, want 0.17.5", cfg.Version)
-	}
-	
 	if cfg.JSONLExport != "beads.jsonl" {
 		t.Errorf("JSONLExport = %q, want beads.jsonl", cfg.JSONLExport)
 	}
@@ -29,7 +25,7 @@ func TestLoadSaveRoundtrip(t *testing.T) {
 		t.Fatalf("failed to create .beads directory: %v", err)
 	}
 	
-	cfg := DefaultConfig("0.17.5")
+	cfg := DefaultConfig()
 	
 	if err := cfg.Save(beadsDir); err != nil {
 		t.Fatalf("Save() failed: %v", err)
@@ -48,10 +44,6 @@ func TestLoadSaveRoundtrip(t *testing.T) {
 		t.Errorf("Database = %q, want %q", loaded.Database, cfg.Database)
 	}
 	
-	if loaded.Version != cfg.Version {
-		t.Errorf("Version = %q, want %q", loaded.Version, cfg.Version)
-	}
-	
 	if loaded.JSONLExport != cfg.JSONLExport {
 		t.Errorf("JSONLExport = %q, want %q", loaded.JSONLExport, cfg.JSONLExport)
 	}