step 4: add digital bar level and status gauges

codex/AGENTS.md

@@ -2,7 +2,7 @@
 
 ## Current status
 
-Step 3 completed and verified with automated checks. Ready to start Step 4.
+Step 4 completed and verified with automated checks. Step 4 commit is pending.
 
 ## Completed steps
 
@@ -30,6 +30,15 @@ Step 1 - Public API contract and pure core:
 
 Step 4 - Digital, bar, level, and status gauges.
 
+Implemented during Step 4:
+
+- Added digital gauge drawlist rendering with formatted value text.
+- Added bar and level gauge rendering with horizontal/vertical fill geometry.
+- Added threshold band and marker drawing for bar/level gauges.
+- Added status light rendering with configured status state colors and text.
+- Added Dear PyGui item callback wiring for gauges with `callback=`.
+- Added Step 4 examples and tests for geometry, runtime updates, thresholds, markers, and status states.
+
 Step 3 - Widget shell and renderer foundation:
 
 Implemented during Step 3:
@@ -69,7 +78,7 @@ Implemented during Step 2:
 
 ## Known issues 
 
-Manual visual example checks were not run in this headless session.
+Manual visual example checks for Steps 3 and 4 were not run in this headless session.
 
 ## Commands used
 
@@ -102,7 +111,14 @@ Manual visual example checks were not run in this headless session.
 - Ran `uv run ruff format .`.
 - Ran `uv run ruff format --check .`.
 - Ran `uv run pyright`.
+- Committed Step 3 with `git commit -m "step 3: add widget shell and renderer foundation"` before starting Step 4.
+- Read `codex/FEATURES.md`, `codex/ARCHITECTURE.md`, `codex/STEPS.md`, and `codex/AGENTS.md` before Step 4 changes.
+- Implemented Step 4 digital, bar, level, and status rendering, threshold/marker drawing, callback wiring, examples, README status update, and tests.
+- Ran `uv run pytest`.
+- Ran `uv run ruff check .`.
+- Ran `uv run ruff format --check .`.
+- Ran `uv run pyright`.
 
 ## Next action 
 
-Implement Step 4.
+Commit Step 4, then implement Step 5.