add task list for Plunk email driver implementation

tasks/tasks-plunk-email-driver.md

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+## Relevant Files
+
+- `/home/user/bknd/app/src/core/drivers/email/plunk.ts` - Main Plunk email driver implementation
+- `/home/user/bknd/app/src/core/drivers/email/plunk.spec.ts` - Unit tests for Plunk email driver
+- `/home/user/bknd/app/src/core/drivers/email/index.ts` - Email driver interface definition (reference)
+- `/home/user/bknd/app/src/core/drivers/index.ts` - Main drivers export file (needs update to export plunkEmail)
+- `/home/user/bknd/app/src/core/drivers/email/resend.ts` - Reference implementation to follow same pattern
+
+### Notes
+
+- Follow the same factory pattern used in `resend.ts` for consistency
+- Use Bun's test framework (`bun:test`) for unit tests
+- Tests require `PLUNK_API_KEY` environment variable for integration tests
+- Plunk API endpoint: `https://api.useplunk.com/v1/send`
+- Maximum 5 recipients per email (Plunk API limitation)
+- Run tests with: `bun test app/src/core/drivers/email/plunk.spec.ts`
+
+## Instructions for Completing Tasks
+
+**IMPORTANT:** As you complete each task, you must check it off in this markdown file by changing `- [ ]` to `- [x]`. This helps track progress and ensures you don't skip any steps.
+
+Example:
+- `- [ ] 1.1 Read file` → `- [x] 1.1 Read file` (after completing)
+
+Update the file after completing each sub-task, not just after completing an entire parent task.
+
+## Tasks
+
+- [ ] 0.0 Create feature branch
+- [ ] 1.0 Implement Plunk email driver
+- [ ] 2.0 Create unit tests for Plunk driver
+- [ ] 3.0 Update driver exports
+- [ ] 4.0 Verify implementation and run tests
+- [ ] 5.0 Commit and push changes