Trunk and semgrep fixes

.github/prompts/mcp-diagnose.prompt.md

@@ -28,7 +28,7 @@ This prompt assumes the meshtastic MCP server is registered with your VS Code Co
 
 4. **Render per-device report** as a compact block:
 
-   ```
+   ```text
    [nrf52 @ /dev/cu.usbmodem1101]      fw=2.7.23.bce2825, hw=RAK4631
      owner       : Meshtastic 40eb / 40eb
      region/band : US, channel 88, LONG_FAST

.github/prompts/mcp-repro.prompt.md

@@ -25,7 +25,7 @@ Equivalent of `.claude/commands/repro.md`. Use when the operator says "that one
 
 4. **Tally** results as you go:
 
-   ```
+   ```text
    attempt 1: PASS (42s)
    attempt 2: FAIL (128s)    ← fw log captured
    attempt 3: PASS (39s)