step 3: add widget shell and renderer foundation

codex/AGENTS.md

@@ -2,7 +2,7 @@
 
 ## Current status
 
-Step 2 completed and verified. Ready to start Step 3.
+Step 3 completed and verified with automated checks. Ready to start Step 4.
 
 ## Completed steps
 
@@ -28,7 +28,18 @@ Step 1 - Public API contract and pure core:
 
 ## Current step
 
-Step 3 - Widget shell and renderer foundation.
+Step 4 - Digital, bar, level, and status gauges.
+
+Step 3 - Widget shell and renderer foundation:
+
+Implemented during Step 3:
+
+- Added Dear PyGui widget shell creation for gauge context managers when a DPG context is active.
+- Kept pure registration behavior when no DPG context has been created.
+- Added a renderer foundation that measures drawlist size, redraws stable placeholder background/frame/value text, schedules animation frames, and exposes renderer debug fields.
+- Added draw layer bookkeeping.
+- Added lightweight `gauge_panel` and `gauge_grid` containers.
+- Added Step 3 examples and smoke tests.
 
 Step 2 - State, sizing, animation, and smoothing model:
 
@@ -56,9 +67,9 @@ Implemented during Step 2:
 - The public API should feel like normal Dear PyGui context-manager usage.
 - Each completed build step must be checked, documented in this file, and committed before starting the next step.
 
-## Known issues
+## Known issues 
 
-None yet.
+Manual visual example checks were not run in this headless session.
 
 ## Commands used
 
@@ -84,7 +95,14 @@ None yet.
 - Ran `uv run ruff format --check .`.
 - Ran `uv run pyright`.
 - Updated instructions to require a commit after each completed step.
+- Read `codex/FEATURES.md`, `codex/ARCHITECTURE.md`, `codex/STEPS.md`, and `codex/AGENTS.md` before Step 3 changes.
+- Implemented Step 3 widget shells, renderer foundation, draw layer bookkeeping, layout helpers, examples, smoke tests, README status update, and diagnostics renderer fields.
+- Ran `uv run pytest`.
+- Ran `uv run ruff check .`.
+- Ran `uv run ruff format .`.
+- Ran `uv run ruff format --check .`.
+- Ran `uv run pyright`.
 
-## Next action
+## Next action 
 
-Implement Step 3.
+Implement Step 4.