feat: add Telegram soak test for OpenClaw (--soak mode) (#2492)

Add a soak test that provisions OpenClaw on Sprite, waits 1 hour for
stabilization, injects a Telegram bot token, and runs integration tests
against the Telegram Bot API (getMe, sendMessage, getWebhookInfo).

- New: sh/e2e/lib/soak.sh — soak test library with all Telegram-specific logic
- Modified: sh/e2e/e2e.sh — add --soak flag to arg parser
- Modified: qa.sh — add soak run mode (bypasses Claude, runs e2e.sh directly)
- Modified: trigger-server.ts — add "soak" to VALID_REASONS
- Modified: qa.yml — add soak to workflow_dispatch options

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: A <258483684+la14-1@users.noreply.github.com>

.github/workflows/qa.yml

@@ -13,6 +13,7 @@ on:
           - schedule
           - e2e
           - fixtures
+          - soak
 jobs:
   trigger:
     runs-on: ubuntu-latest