convert drawing/index.js to named exports for tree-shaking

Convert all 56 methods from aggregation pattern (`drawing.method = fn`)
to named exports (`export function method(...)`). Update 18 consumer
files in the factory bundle to use named imports.

Keeps `export default { ... }` for backward compat with 50+ files
outside the factory bundle.

Factory: 704 KB min (was 707 KB, -3 KB). Modest savings because 40 of
56 methods are still used; the win is in enabling future tree-shaking
as more consumers switch to named imports.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ryan-williams

perf/bundle-compare/thresholds.json

@@ -1,13 +1,13 @@
 {
     "upstream_full__min_": 4831947,
     "upstream_basic__min_": 1114816,
-    "fork_full__min_": 4809599,
-    "fork_basic__min_": 1095962,
-    "fork_minimal__min_": 988257,
-    "fork_lite__min_": 848252,
+    "fork_full__min_": 4807649,
+    "fork_basic__min_": 1093881,
+    "fork_minimal__min_": 986167,
+    "fork_lite__min_": 846142,
     "app___upstream_basic": 1115573,
-    "app___fork_basic": 1096110,
-    "app___fork_lite": 848344,
-    "fork_factory__min_": 723903,
-    "app___fork_factory": 723903
+    "app___fork_basic": 1094029,
+    "app___fork_lite": 846234,
+    "fork_factory__min_": 720668,
+    "app___fork_factory": 720668
 }

perf/thresholds.json

@@ -1,19 +1,19 @@
 {
     "bundleSize": {
         "lite": {
-            "expected_bytes": 1803246
+            "expected_bytes": 1801210
         },
         "lite-min": {
             "expected_bytes": 916326
         },
         "minimal": {
-            "expected_bytes": 2125973
+            "expected_bytes": 2123964
         },
         "minimal-min": {
             "expected_bytes": 1076875
         },
         "basic": {
-            "expected_bytes": 2431057
+            "expected_bytes": 2429051
         },
         "basic-min": {
             "expected_bytes": 1185641