docs(bf-5kns): document Blob constructor search results

Found 4 direct Blob() constructor calls across 3 JavaScript files:
- 2 for CSV export (text/csv)
- 2 for JSON config export (application/json)

All calls follow consistent pattern with array-wrapped content
and explicit MIME type specification.

notes/bf-5kns.md

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+# Blob Constructor Search Results (bf-5kns)
+
+## Summary
+Found **4 occurrences** of direct `Blob()` constructor calls across **3 files**.
+
+## Locations
+
+### 1. `/home/coding/spaxel/dashboard/static/js/fleet.js` - Line 457
+**Context:** CSV export functionality
+```javascript
+const blob = new Blob([csvContent], { type: 'text/csv' });
+```
+- **Purpose:** Creates a blob for CSV file download containing fleet data
+- **Type:** `text/csv`
+- **Function:** `downloadCSV()`
+
+### 2. `/home/coding/spaxel/dashboard/js/fleet-page.js` - Line 1034
+**Context:** Configuration export functionality
+```javascript
+const blob = new Blob([JSON.stringify(data, null, 2)], { type: 'application/json' });
+```
+- **Purpose:** Creates a blob for JSON configuration file download
+- **Type:** `application/json`
+- **Function:** `exportConfig()`
+
+### 3. `/home/coding/spaxel/dashboard/js/fleet-page.js` - Line 1369
+**Context:** CSV export functionality
+```javascript
+const blob = new Blob([csvContent], { type: 'text/csv' });
+```
+- **Purpose:** Creates a blob for CSV file download containing filtered fleet data
+- **Type:** `text/csv`
+- **Function:** `downloadCSV()`
+
+### 4. `/home/coding/spaxel/dashboard/js/fleet.js` - Line 1997
+**Context:** Configuration export functionality
+```javascript
+var blob = new Blob([JSON.stringify(data, null, 2)], { type: 'application/json' });
+```
+- **Purpose:** Creates a blob for JSON configuration file download
+- **Type:** `application/json`
+- **Function:** `exportConfig()`
+
+## Patterns Observed
+
+All Blob constructor calls follow the same pattern:
+1. **Array-wrapped content:** `[data]` - always wrapped in an array
+2. **MIME type specified:** All calls include explicit `{ type: '...' }` option
+3. **Two content types:**
+   - `text/csv` for fleet data exports
+   - `application/json` for configuration exports
+
+## Acceptance Criteria Met
+
+- ✅ All 'new Blob()' calls identified (4 total)
+- ✅ Each location documented with file path and line number
+- ✅ Code context captured for each site
+
+## Files Analyzed
+
+**JavaScript files:**
+- `/home/coding/spaxel/dashboard/static/js/fleet.js`
+- `/home/coding/spaxel/dashboard/js/fleet-page.js`
+- `/home/coding/spaxel/dashboard/js/fleet.js`
+
+**No TypeScript files** with Blob constructors were found in the codebase.