docs(home): split "See it in action" into compact scalar + table snippets

The homepage showcased the full 75-line combined worker, which is heavy for a
teaser. Now it shows just the scalar function and just the table function as two
focused snippets, extracted from examples/calc_worker.py via pymdownx snippet
sections (markers are stripped, so the full-file embeds in the tutorial/catalogs
stay clean). Links to the tutorial for the complete worker.

Verified: section markers don't leak into full-file embeds; calc_worker still
serves; doc tests pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: rustyconover

docs/index.md

@@ -18,15 +18,21 @@ Built by [🚜 Query.Farm](https://query.farm).
 
 ## See it in action
 
-A complete worker — a scalar function and a table function — in one file:
+A **scalar** function — one row in, one row out:
 
 ```python
---8<-- "examples/calc_worker.py"
+--8<-- "examples/calc_worker.py:scalar"
 ```
 
-The `# /// script` block is [inline script metadata](https://packaging.python.org/en/latest/specifications/inline-script-metadata/):
-`uv run calc_worker.py` provisions an isolated environment with `vgi-python` and runs the worker —
-no virtualenv to create.
+A **table** function — generate rows from an argument:
+
+```python
+--8<-- "examples/calc_worker.py:table"
+```
+
+Drop both into a `Worker`, add an [inline-script-metadata](https://packaging.python.org/en/latest/specifications/inline-script-metadata/)
+header, and `uv run` it — no virtualenv, nothing to `pip install`. (The
+[tutorial](tutorial/index.md) builds the complete file step by step.)
 
 ```sql
 INSTALL vgi FROM community;

examples/calc_worker.py

@@ -29,6 +29,7 @@
 )
 
 
+# --8<-- [start:scalar]
 class Double(ScalarFunction):
     """Double each input value (one row in, one row out)."""
 
@@ -41,6 +42,10 @@ def compute(
         return pc.multiply(value, 2)
 
 
+# --8<-- [end:scalar]
+
+
+# --8<-- [start:table]
 @dataclass(slots=True, frozen=True, kw_only=True)
 class SeriesArgs:
     """Arguments for :class:`Series` (one positional ``count``)."""
@@ -67,6 +72,9 @@ def process(cls, params: ProcessParams[SeriesArgs], state: None, out: OutputColl
         out.finish()
 
 
+# --8<-- [end:table]
+
+
 class CalcWorker(Worker):
     """A worker exposing the ``calc`` catalog with both functions."""