fix(tools): identity audit exemptions + import hierarchy (#69 #70)

#69: audit-theme-design tags hue/CVD/ANSI-family noise on white,
vantablack, lumon, hackerman, matte-black, miasma as [identity] with a
legend — do not retune identity palettes into traffic lights.

#70: import-palettes keeps surface≠overlay when color0==color8, derives
light UI chips from base (ANSI-black trap), gentler light mantle; roles
are first-class. No bulk re-import of shipped theme JSON.

Verified: V0 (py_compile + synthetic import fixtures + audit report).

agent/MEMORY.md

@@ -86,6 +86,14 @@ iteration would otherwise rediscover.
   the module on it; a new `class` that only recolors an existing glyph is
   a regression. Suppressed notification states (DND *and* app-inhibited)
   all use the bell-off glyph + @muted.
+- **Identity themes are not traffic lights** (#69): white, vantablack,
+  lumon, hackerman, matte-black, miasma — monochrome / mono-hue / earthy
+  status by design. `audit-theme-design.py` tags their hue/CVD/ANSI-family
+  findings `[identity]`; do not "fix" them into R/Y/G.
+- **Import hierarchy ≠ ANSI** (#70): `import-palettes.py` must not set
+  surface==overlay when color0==color8; light color0 is often ANSI black
+  (not a chip). Roles are first-class — never bulk-reimport shipped JSON
+  without a hierarchy pass.
 
 ## Gotchas (cost a debugging session once)
 - Waybar `layer: top` renders above **even real-fullscreen windows** — the