feat: add DBOS skills for TypeScript, Python, and Go (#94)

Add three DBOS SDK skills with reference documentation for building
reliable, fault-tolerant applications with durable workflows.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

skills/dbos-python/references/workflow-timeout.md

@@ -0,0 +1,59 @@
+---
+title: Set Workflow Timeouts
+impact: CRITICAL
+impactDescription: Prevents runaway workflows from consuming resources
+tags: timeout, cancel, deadline, limits
+---
+
+## Set Workflow Timeouts
+
+Use `SetWorkflowTimeout` to limit workflow execution time. Timed-out workflows are cancelled.
+
+**Incorrect (no timeout):**
+
+```python
+@DBOS.workflow()
+def potentially_long_workflow():
+    # Could run forever!
+    while not done:
+        process_next()
+```
+
+**Correct (with timeout):**
+
+```python
+from dbos import SetWorkflowTimeout
+
+@DBOS.workflow()
+def bounded_workflow():
+    while not done:
+        process_next()
+
+# Workflow must complete within 60 seconds
+with SetWorkflowTimeout(60):
+    bounded_workflow()
+
+# Or with start_workflow
+with SetWorkflowTimeout(60):
+    handle = DBOS.start_workflow(bounded_workflow)
+```
+
+Timeout behavior:
+- Timeout is **start-to-completion** (doesn't count queue wait time)
+- Timeouts are **durable** (persist across restarts)
+- Cancellation happens at the **beginning of the next step**
+- **All child workflows** are also cancelled
+
+With queues:
+
+```python
+queue = Queue("example_queue")
+
+# Timeout starts when dequeued, not when enqueued
+with SetWorkflowTimeout(30):
+    queue.enqueue(my_workflow)
+```
+
+Timeouts work with long durations (hours, days, weeks) since they're stored in the database.
+
+Reference: [Workflow Timeouts](https://docs.dbos.dev/python/tutorials/workflow-tutorial#workflow-timeouts)