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/index.ts

@@ -0,0 +1,19 @@
+import { init as initEntityCard } from './entity-card'
+import { init as initHealthSummary } from './health-summary'
+import { init as initLXCList } from './lxc-list'
+import { init as initEntityTable } from './entity-table'
+import { init as initKnowledgeResults } from './knowledge-results'
+import { init as initBlastRadius } from './blast-radius'
+import { init as initChangeLog } from './change-log'
+import { init as initFleetSnapshot } from './fleet-snapshot'
+import { init as initMetricChart } from './metric-chart'
+
+initEntityCard()
+initHealthSummary()
+initLXCList()
+initEntityTable()
+initKnowledgeResults()
+initBlastRadius()
+initChangeLog()
+initFleetSnapshot()
+initMetricChart()