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/step-retries.md

@@ -0,0 +1,44 @@
+---
+title: Configure Step Retries for Transient Failures
+impact: HIGH
+impactDescription: Automatic retries handle transient failures without manual code
+tags: step, retry, exponential-backoff, resilience
+---
+
+## Configure Step Retries for Transient Failures
+
+Steps can automatically retry on failure with exponential backoff. This handles transient failures like network issues.
+
+**Incorrect (manual retry logic):**
+
+```python
+@DBOS.step()
+def fetch_data():
+    # Manual retry logic is error-prone
+    for attempt in range(3):
+        try:
+            return requests.get("https://api.example.com").json()
+        except Exception:
+            if attempt == 2:
+                raise
+            time.sleep(2 ** attempt)
+```
+
+**Correct (built-in retries):**
+
+```python
+@DBOS.step(retries_allowed=True, max_attempts=10, interval_seconds=1.0, backoff_rate=2.0)
+def fetch_data():
+    # Retries handled automatically
+    return requests.get("https://api.example.com").json()
+```
+
+Retry parameters:
+- `retries_allowed`: Enable automatic retries (default: False)
+- `max_attempts`: Maximum retry attempts (default: 3)
+- `interval_seconds`: Initial delay between retries (default: 1.0)
+- `backoff_rate`: Multiplier for exponential backoff (default: 2.0)
+
+With defaults, retry delays are: 1s, 2s, 4s, 8s, 16s...
+
+Reference: [Configurable Retries](https://docs.dbos.dev/python/tutorials/step-tutorial#configurable-retries)