Add renderer resource label contract

docs/modernization/roadmap.md

@@ -417,7 +417,8 @@ Status: started. `pp_renderer_api` exists as a headless renderer-neutral target
 with explicit texture usage flags, texture descriptor, byte-size, viewport,
 mesh, readback bounds, command context, render device, shader program
 descriptor, mesh, render target, readback byte-size helpers,
-texture mip-level validation, texture-upload/readback command validation,
+texture mip-level validation, resource debug-label validation,
+texture-upload/readback command validation,
 mipmap-generation command validation, frame-capture byte-size helpers,
 frame-capture command validation, render-target blit validation, texture-slot
 binding validation, blend-state validation, scissor-state validation,
@@ -723,10 +724,10 @@ Results:
   plus malformed payload rejection at the export boundary.
 - `pp_renderer_api_tests` passed, including shader descriptor validation,
   PanoPainter shader catalog validation, explicit texture usage validation,
-  texture mip-level validation, readback byte-size and command-order
-  validation, texture-upload byte-count validation, mipmap-generation command
-  validation, trace marker/scope validation, frame-capture byte-size and
-  command-order validation,
+  texture mip-level validation, resource debug-label validation, readback
+  byte-size and command-order validation, texture-upload byte-count validation,
+  mipmap-generation command validation, trace marker/scope validation,
+  frame-capture byte-size and command-order validation,
   render-target blit validation, texture-slot binding validation, blend-state
   validation, scissor-state validation, render-pass color/depth/stencil clear
   validation, shader-uniform write validation, draw descriptor/range
@@ -834,8 +835,8 @@ Results:
   texture-usage/texture-bind/sampler-bind/shader-uniform/texture-upload/
   mipmap-generation/readback/frame-capture/blit validation plus explicit draw
   descriptor and texture-copy validation; it creates validated textures,
-  render targets, shaders, meshes, and readback buffers, then records commands,
-  trace markers/scopes, render-pass
+  render targets, shaders, meshes, and readback buffers with validated debug
+  labels, then records commands, trace markers/scopes, render-pass
   color/depth/stencil clear intent, scissor state, depth state, blend state,
   shader uniform writes, texture/sampler binds, draw mesh inputs, explicit draw
   ranges, texture uploads/mipmap generations/copies/readbacks, frame captures,
@@ -843,7 +844,8 @@ Results:
   does not require a window or GL context.
 - `pano_cli record-render` exercises that headless recording renderer and emits
   JSON command counts, resource creation counts, target dimensions, backend
-  name, trace marker/scope and draw summary, render-pass/depth-clear counts, and draw
+  name, trace marker/scope and draw summary, labeled descriptor counts,
+  render-pass/depth-clear counts, and draw
   descriptor vertex/index totals, scissor/depth/blend-state plus
   shader-uniform/texture/sampler-bind/upload/texture-copy/readback/
   frame-capture/blit command/byte totals for agent automation, with an