fix(ci): increase smoke workflow timeouts from 5 to 15 minutes

With --build-local, Docker image builds take 7+ minutes on cold cache
(no layer cache on CI runners). The 5-minute step timeout causes the
Copilot CLI execution step to be killed before the agent even starts.

Increase timeout-minutes from 5 to 15 in:
- smoke-copilot-byok (md + lock)
- smoke-copilot (md + lock)
- smoke-gemini (md only, lock was already 15)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: lpcox

.github/workflows/smoke-copilot-byok.lock.yml

@@ -35,7 +35,7 @@ safe-outputs:
     run-started: "🔑 [{workflow_name}]({run_url}) is testing offline BYOK mode on this {event_type}..."
     run-success: "✅ [{workflow_name}]({run_url}) completed. Copilot BYOK mode operational. 🔓"
     run-failure: "❌ [{workflow_name}]({run_url}) reports {status}. BYOK mode investigation needed..."
-timeout-minutes: 5
+timeout-minutes: 15
 env:
   COPILOT_API_KEY: dummy-byok-key-for-offline-mode
   COPILOT_MODEL: claude-opus-4.6

.github/workflows/smoke-copilot-byok.md

@@ -37,7 +37,7 @@ safe-outputs:
     run-started: "📰 BREAKING: [{workflow_name}]({run_url}) is now investigating this {event_type}. Sources say the story is developing..."
     run-success: "📰 VERDICT: [{workflow_name}]({run_url}) has concluded. All systems operational. This is a developing story. 🎤"
     run-failure: "📰 DEVELOPING STORY: [{workflow_name}]({run_url}) reports {status}. Our correspondents are investigating the incident..."
-timeout-minutes: 5
+timeout-minutes: 15
 sandbox:
   agent:
     version: v0.25.29

.github/workflows/smoke-copilot.lock.yml

@@ -39,7 +39,7 @@ secrets:
   GEMINI_API_KEY:
     value: ${{ secrets.GEMINI_API_KEY }}
     description: "Google Gemini API key for inference"
-timeout-minutes: 5
+timeout-minutes: 15
 sandbox:
   agent:
     version: v0.25.29