Quack mode (#174)

Solves #32. Blog post incoming!

I also introduced a `.lea_cache` to cache the SQLGlot tokenization
process (~6s for Carbonfact's scripts). It's what SQLMesh does too. This
combined with deferring heavy unnecessary imports makes the CLI feel
instant. And I moved from pre-commit to prek and fixed a lot of code
quality issues.

<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Adds Quack mode to run most of the DAG locally on DuckLake with
automatic SQL transpilation, only using the native warehouse (e.g.
BigQuery) for scripts with external dependencies. Also adds a
`.lea_cache` to cache SQLGlot parsing for faster DAG builds and switches
tooling to `prek`.

- New Features
- Quack mode (`--quack`): classifies scripts, runs eligible ones on
DuckLake, and transpiles SQL via `sqlglot`; only external-dependent
scripts (and their ancestors) run on the native warehouse.
- Added `DuckLake` warehouse support, dialect attach/setup, and robust
transpilation/classification logic with extensive tests.
- Script parsing cache (`.lea_cache`) to store dependencies; includes
tests and a `examples/quack` demo.

- Dependencies
- Replace pre-commit with `prek`; CI updated to `uv run prek run
--all-files`. Add `ruff` and `ty` hooks.
- Bump to version 0.17.0 and relax `sqlglot` pin; minor README updates.

<sup>Written for commit d5414d6.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

---------

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

Author: MaxHalford

.github/workflows/ci.yml

@@ -18,5 +18,5 @@ jobs:
       - uses: astral-sh/setup-uv@v7
         with:
           enable-cache: true
-      - run: uv run pre-commit run --all-files
+      - run: uv run prek run --all-files
       - run: uv run pytest

.gitignore

@@ -6,3 +6,6 @@ dist/
 /*.ipynb
 .DS_Store
 *.wal
+*.parquet
+*.ducklake
+ui

.pre-commit-config.yaml

@@ -1,22 +1,19 @@
-files: .
 repos:
-  - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.4.0
-    hooks:
-      - id: check-json
-      - id: check-yaml
-      - id: trailing-whitespace
-      - id: mixed-line-ending
-
-  - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.1.7
+  - repo: local
     hooks:
       - id: ruff
+        name: ruff linter
+        entry: uv run ruff check --fix
+        language: system
+        types: [python]
       - id: ruff-format
-  - repo: local
-    hooks:
-      - id: check-external-actions-pinned
-        name: Check GitHub Actions are pinned
-        entry: pre-commit-hooks/check_pinned_actions.sh
-        language: script
-        pass_filenames: false
+        name: ruff formatter
+        entry: uv run ruff format
+        language: system
+        types: [python]
+      - id: ty
+        name: ty type checker
+        entry: uv run ty check lea
+        language: system
+        types: [python]
+        pass_filenames: false