Update ai bundle size and clarify ArcDemo comment

Bump the documented size of `semiotic/ai` from 211KB to 215KB across README.md, CLAUDE.md, and ai/system-prompt.md to reflect an updated build. Also expand the comment in ConversationArcPage.js's ArcDemo to clarify the meaning of `enableOnMount: false`, note that the underlying store is module-scoped and shared with AutoInstrumentDemo, and explain why `enabled` may be true on first render. These are documentation/comment-only changes.

Author: emeeks

CLAUDE.md

@@ -4,7 +4,7 @@
 - Install: `npm install semiotic`
 <!-- semiotic-bundle-sizes:start -->
 <!-- Auto-generated by scripts/sync-bundle-sizes.mjs — do not edit by hand. -->
-- **Use sub-path imports** — `semiotic/xy` (86KB gz), `semiotic/ordinal` (70KB gz), `semiotic/network` (64KB gz), `semiotic/geo` (52KB gz), `semiotic/realtime` (91KB gz), `semiotic/server` (122KB gz), `semiotic/utils` (22KB gz), `semiotic/recipes` (5KB gz), `semiotic/themes` (4KB gz), `semiotic/data` (3KB gz), `semiotic/ai` (211KB gz). Full `semiotic` is 190KB gz.
+- **Use sub-path imports** — `semiotic/xy` (86KB gz), `semiotic/ordinal` (70KB gz), `semiotic/network` (64KB gz), `semiotic/geo` (52KB gz), `semiotic/realtime` (91KB gz), `semiotic/server` (122KB gz), `semiotic/utils` (22KB gz), `semiotic/recipes` (5KB gz), `semiotic/themes` (4KB gz), `semiotic/data` (3KB gz), `semiotic/ai` (215KB gz). Full `semiotic` is 190KB gz.
 <!-- semiotic-bundle-sizes:end -->
 - CLI: `npx semiotic-ai [--schema|--compact|--examples|--doctor]`
 - MCP: `npx semiotic-mcp`

README.md

@@ -297,7 +297,7 @@ Semiotic ships 12 entry points. **Don't import from `"semiotic"` unless you need
 | `semiotic/recipes` | **5 KB** | Pure layout functions (waffle, marimekko, flextree, dagre, …) |
 | `semiotic/themes` | **4 KB** | Theme presets only (tufte, carbon, etc.) |
 | `semiotic/data` | **3 KB** | bin, rollup, groupBy, pivot, fromVegaLite |
-| `semiotic/ai` | **211 KB** | All 42 HOCs + validation — optimized for LLM code generation |
+| `semiotic/ai` | **215 KB** | All 42 HOCs + validation — optimized for LLM code generation |
 | `semiotic` | **190 KB** | Everything below (full bundle) |
 
 <!-- semiotic-bundle-sizes:end -->

ai/system-prompt.md

@@ -2,7 +2,7 @@
 
 <!-- semiotic-bundle-sizes:start -->
 <!-- Auto-generated by scripts/sync-bundle-sizes.mjs — do not edit by hand. -->
-**Use sub-path imports** — `semiotic/xy` (86KB gz), `semiotic/ordinal` (70KB gz), `semiotic/network` (64KB gz), `semiotic/geo` (52KB gz), `semiotic/realtime` (91KB gz), `semiotic/server` (122KB gz), `semiotic/utils` (22KB gz), `semiotic/recipes` (5KB gz), `semiotic/themes` (4KB gz), `semiotic/data` (3KB gz), `semiotic/ai` (211KB gz). Full `semiotic` is 190KB gz.
+**Use sub-path imports** — `semiotic/xy` (86KB gz), `semiotic/ordinal` (70KB gz), `semiotic/network` (64KB gz), `semiotic/geo` (52KB gz), `semiotic/realtime` (91KB gz), `semiotic/server` (122KB gz), `semiotic/utils` (22KB gz), `semiotic/recipes` (5KB gz), `semiotic/themes` (4KB gz), `semiotic/data` (3KB gz), `semiotic/ai` (215KB gz). Full `semiotic` is 190KB gz.
 <!-- semiotic-bundle-sizes:end -->
 
 ## Flat Array Data (`data: object[]`)

docs/src/pages/features/ConversationArcPage.js

@@ -192,10 +192,13 @@ function ArcSummaryPanel({ summary, enabled }) {
 
 function ArcDemo() {
   // The hook owns subscription, re-render coordination, and snapshot
-  // stability via useSyncExternalStore. `enableOnMount: false` lets the
-  // button drive enable/disable; if we let the hook auto-enable, the
-  // button would always be in the "currently recording" state when the
-  // page loads.
+  // stability via useSyncExternalStore. `enableOnMount: false` means
+  // this demo's toggle button is what flips THIS hook's intent to
+  // record. The underlying store is module-scoped, so AutoInstrumentDemo
+  // below also touches it; readers may see `enabled` true on first
+  // render if that demo mounted first and called `enableConversationArc()`.
+  // That's intentional — the demos share one buffer to demonstrate the
+  // module-scope contract.
   const { history: events, summary, enabled, sessionId, record, clear: clearArc } =
     useConversationArc({ enableOnMount: false })
   const chartRef = useRef(null)