refactor: unify "Executions" → "Exchanges" terminology

Rename all references from "Execution/executions/execCount" to
"Exchange/exchanges/exchangeCount" to align with Apache Camel's
native Exchange concept. Java class names (CamelExecutionException,
HttpOperationFailedException) are preserved as-is.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/superpowers/specs/2026-03-18-design-system-design.md

@@ -184,7 +184,7 @@ src/
 │   ├── ExchangeDetail/
 │   └── AgentHealth/
 ├── mocks/                          # Static TypeScript mock data
-│   ├── executions.ts
+│   ├── exchanges.ts
 │   ├── routes.ts
 │   ├── agents.ts
 │   └── metrics.ts
@@ -361,7 +361,7 @@ All CSS custom properties for both themes. Light values sourced from `mock-v2-li
 #### CommandPalette
 - Full-screen overlay modal triggered by Ctrl+K
 - Search input with scoped filter tags (removable, amber-styled)
-- Category tabs with counts (All, Executions, Routes, Exchanges, Agents)
+- Category tabs with counts (All, Exchanges, Routes, Agents)
 - Grouped results by category with section headers
 - Result items: icon + title + badges + meta + timestamp
 - Inline expandable detail (JSON preview with match highlighting)
@@ -371,7 +371,7 @@ All CSS custom properties for both themes. Light values sourced from `mock-v2-li
 - Props: `open: boolean`, `onClose`, `onSelect: (result: SearchResult) => void`, `data: SearchResult[]`
 - `SearchResult` interface:
   ```ts
-  type SearchCategory = 'execution' | 'route' | 'exchange' | 'agent'
+  type SearchCategory = 'exchange' | 'route' | 'agent'
   interface SearchResult {
     id: string
     category: SearchCategory
@@ -451,7 +451,7 @@ All CSS custom properties for both themes. Light values sourced from `mock-v2-li
 #### ProcessorTimeline
 - Gantt-style horizontal bar timeline for exchange processor steps
 - Each bar: processor name (left label), colored bar (green=ok, amber=slow, red=fail), duration label (right)
-- Bar width proportional to duration relative to total execution time
+- Bar width proportional to duration relative to total exchange time
 - Clickable bars (select processor)
 - Props: `processors: { name: string; type: string; durationMs: number; status: 'ok' | 'slow' | 'fail'; startMs: number }[]`, `totalMs: number`, `onProcessorClick?`
 
@@ -518,7 +518,7 @@ Pages are built after the design system layer is complete.
 
 Static TypeScript objects in `src/mocks/` providing realistic data matching the HTML mockups:
 
-- `executions.ts` — execution rows with status, duration, order IDs, error messages
+- `exchanges.ts` — exchange rows with status, duration, order IDs, error messages
 - `routes.ts` — route definitions with processor lists
 - `agents.ts` — agent health data (name, version, status, tps, last-seen)
 - `metrics.ts` — KPI values, chart data points