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/tool-renderers.ts

@@ -0,0 +1,17 @@
+import type { Component } from 'svelte'
+import type { ToolCallResult } from '$lib/stores/chat'
+
+export interface ToolRenderer {
+  match: (tool: ToolCallResult) => boolean
+  component: Component<{ tool: ToolCallResult }>
+}
+
+const registry: ToolRenderer[] = []
+
+export function registerToolRenderer(r: ToolRenderer) {
+  registry.push(r)
+}
+
+export function getToolRenderer(tool: ToolCallResult): ToolRenderer | undefined {
+  return registry.find((r) => r.match(tool))
+}