feat(chat): MCP tool apps — custom inline renderers for 12 tools

12 of 33 MCP tools now render as rich inline cards instead of raw JSON:
EntityCard, HealthSummary, LXCList, EntityTable, KnowledgeResults,
BlastRadius, ChangeLog, FleetSnapshot, MetricChart.

Architecture:
- Server: annotateJSONResult() wraps queryRows with __renderer hints
- Registry: match/dispatch system maps tool names to Svelte components
- Chat: inline dispatch with 5-card limit, overflow to collapsed group
- ToolCallGroup: unmatched prop, hides when all matched, ARIA labels

Tests: 3 new Go tests for annotateJSONResult (wrap, no-op, multi-row).

web/src/lib/renderers/entity-card.ts

@@ -0,0 +1,11 @@
+import { registerToolRenderer } from '$lib/tool-renderers'
+import EntityCard from './EntityCard.svelte'
+
+const TOOLS = ['get_entity', 'whoami', 'explain']
+
+export function init() {
+  registerToolRenderer({
+    match: (t) => TOOLS.includes(t.name) || t.result?.__renderer === 'entity_card',
+    component: EntityCard,
+  })
+}