feat(types): Huge + Angle + Percent polish numeric types (#55)

Types phase 5 (polish). A splice-on-demand numeric runtime
(runtime/native/numeric.ludic, built on the inline Math.* trig) behind three
namespaces:

- Huge.* — idle big numbers (normalized mantissa x 10^exponent): from/add/
  sub/mul/neg/cmp/sign/mantissa/exp/str (scientific 1.23e45). Display-scale,
  not lockstep-exact (BigInt/Decimal for exactness).
- Angle.* — auto-wrapping radians: from_degrees/to_degrees/wrap/sin/cos/add/
  diff (shortest signed rotation)/lerp (shortest arc).
- Percent.* — clamped [0,1]: clamp/of/lerp/apply.

Remaining phase-5 items are already covered (duration=Duration.*,
rune=Unicode.*, i64=long) or need a type-checking pass (handle, typed name,
other sized ints) — tracked for later.

Wired: parser splice trigger (g_uses_numeric), emit_call dispatch, reseeded
seed, a self-asserting example (examples/library/numeric.ludic + feat_case),
per-symbol docs + inventory. All suites green incl. golden renders byte-
identical and the bootstrap fixpoint.

NOTE: fixed `const`s lower to raw-int-typed values (emit_call N_CONST), which
breaks fixed comparisons — the runtime uses inline fixed literals instead.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tools/docgen/inventory.json

@@ -432,6 +432,34 @@
     "set-clear",
     "set-members"
   ],
+  "huge": [
+    "huge-from",
+    "huge-add",
+    "huge-sub",
+    "huge-mul",
+    "huge-neg",
+    "huge-cmp",
+    "huge-sign",
+    "huge-mantissa",
+    "huge-exp",
+    "huge-str"
+  ],
+  "angle": [
+    "angle-from_degrees",
+    "angle-to_degrees",
+    "angle-wrap",
+    "angle-sin",
+    "angle-cos",
+    "angle-add",
+    "angle-diff",
+    "angle-lerp"
+  ],
+  "percent": [
+    "percent-clamp",
+    "percent-of",
+    "percent-lerp",
+    "percent-apply"
+  ],
   "duration": [
     "duration-seconds",
     "duration-minutes",