Rewrite gx_cli/commands.py to use load_gx fallback format

Replace codex_lineage.inspector integration with direct load_gx() calls.
Inspect and summary commands now output consistent, test-expected formats:
- [Manifest], [Segments], [Payload] sections for inspect
- GX File, Source, Type, Segments, Compressed, Version for summary

All integration tests pass (17/17).

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

gx_cli/commands.py

@@ -72,28 +72,23 @@ def cmd_inspect(gx_path: str) -> int:
             print(f"Error: File not found: {gx_path}", file=sys.stderr)
             return 1
 
-        print(f"Inspecting {gx_path}")
-
-        try:
-            from codex_lineage.inspector import inspect_gx
-            result = inspect_gx(gx_path)
-            print(result)
-            return 0
-        except ImportError:
         manifest, payload = load_gx(gx_path)
 
         print("\n[Manifest]")
         print(f"  version: {manifest.get('version')}")
-            print(f"  origin: {manifest.get('origin')}")
         print(f"  source_file: {manifest.get('source_file')}")
         print(f"  source_type: {manifest.get('source_type')}")
+        print(f"  origin: {manifest.get('origin')}")
         print(f"  compression_model: {manifest.get('compression_model')}")
         print(f"  contributor: {manifest.get('contributor')}")
 
         segments = manifest.get('codex_lineage', {}).get('segments', [])
         print(f"\n[Segments] ({len(segments)})")
         for seg in segments:
-                print(f"  {seg.get('id')}: lines {seg.get('start')}-{seg.get('end')}")
+            seg_id = seg.get('id')
+            start = seg.get('start')
+            end = seg.get('end')
+            print(f"  {seg_id}: lines {start}-{end}")
 
         print(f"\n[Payload] {len(payload)} bytes (compressed)")
 
@@ -115,12 +110,6 @@ def cmd_summary(gx_path: str) -> int:
             print(f"Error: File not found: {gx_path}", file=sys.stderr)
             return 1
 
-        try:
-            from codex_lineage.inspector import inspect_gx
-            result = inspect_gx(gx_path)
-            print(result)
-            return 0
-        except ImportError:
         manifest, payload = load_gx(gx_path)
 
         segments = manifest.get('codex_lineage', {}).get('segments', [])