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).

plans/done/2026-07-13-mcp-tool-apps-custom-chat-renderers.md

@@ -0,0 +1,66 @@
+# 2026-07-13 — MCP tool apps: custom in-chat renderers
+
+**Status:** Done — implemented 2026-07-13.
+
+## What was built
+
+12 of 33 MCP tools now render as rich inline cards in the chat instead of raw
+JSON inside a collapsed component. The remaining 21 tools stay collapsed.
+
+### Architecture
+
+- **Server** (`internal/mcp/server.go`): `annotateJSONResult()` function wraps
+  `queryRows` output with `{"__renderer": "...", "data": [...]}` for 12 tools.
+- **Registry** (`web/src/lib/tool-renderers.ts`): match/dispatch system that
+  maps tool names + `__renderer` hints to Svelte components.
+- **Renderer components** (`web/src/lib/renderers/`): 9 purpose-built cards,
+  each handling loading/spinner, error, and success states with proper ARIA
+  labels.
+- **Chat dispatch** (`web/src/pages/Chat.svelte`): matched tools render inline
+  before the markdown text, with a 5-card limit to prevent chat spam. Overflow
+  goes to the collapsed `ToolCallGroup` alongside unmatched tools.
+- **ToolCallGroup** (`web/src/lib/components/ToolCallGroup.svelte`): accepts
+  `unmatched` prop, shows "N tools · M cards shown" when some render inline,
+  hides entirely when all matched.
+
+### Renderers
+
+| Component | Tools matched | Visual |
+|-----------|--------------|--------|
+| `EntityCard` | `get_entity`, `whoami`, `explain` | Slug, type badge, health dot, key attrs |
+| `HealthSummary` | `get_health_summary` | Stacked health bar (healthy/degraded/down) |
+| `LXCList` | `list_lxcs` | Compact table: name, ID, IP, health |
+| `EntityTable` | `list_entities` | Auto-column table from query results |
+| `KnowledgeResults` | `search_knowledge`, `get_entity_knowledge` | Title, snippet, source, slug |
+| `BlastRadius` | `get_blast_radius` | Entities grouped by hop distance |
+| `ChangeLog` | `get_change_history`, `get_agent_activity` | Timeline with status dots |
+| `FleetSnapshot` | `get_state_snapshot` | Health + type counts in a grid |
+| `MetricChart` | `query_metrics` | Bucketed time/avg/min/max table |
+
+### Tests
+
+`internal/mcp/server_test.go`: 3 new tests for `annotateJSONResult` — wraps
+valid JSON arrays, no-op on empty/non-JSON/empty-text content, preserves
+multi-row arrays.
+
+### Files changed
+
+**New (18):**
+- `web/src/lib/tool-renderers.ts`
+- `web/src/lib/renderers/index.ts`
+- `web/src/lib/renderers/EntityCard.svelte` + `entity-card.ts`
+- `web/src/lib/renderers/HealthSummary.svelte` + `health-summary.ts`
+- `web/src/lib/renderers/LXCList.svelte` + `lxc-list.ts`
+- `web/src/lib/renderers/EntityTable.svelte` + `entity-table.ts`
+- `web/src/lib/renderers/KnowledgeResults.svelte` + `knowledge-results.ts`
+- `web/src/lib/renderers/BlastRadius.svelte` + `blast-radius.ts`
+- `web/src/lib/renderers/ChangeLog.svelte` + `change-log.ts`
+- `web/src/lib/renderers/FleetSnapshot.svelte` + `fleet-snapshot.ts`
+- `web/src/lib/renderers/MetricChart.svelte` + `metric-chart.ts`
+
+**Modified (5):**
+- `internal/mcp/server.go` — `annotateJSONResult()` + 12 tool annotations
+- `internal/mcp/server_test.go` — 3 tests for `annotateJSONResult`
+- `web/src/lib/components/ToolCallGroup.svelte` — `unmatched`/`bodyTools`
+- `web/src/pages/Chat.svelte` — inline dispatch + 5-card limit
+- `web/src/main.ts` — deferred renderer import