Add Python bindings

docs/advanced-python.md

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+# Advanced Usage (Python)
+
+## Edit Provenance
+
+Track which changes came from where using `reconcile_with_history`:
+
+```python
+from reconcile_text import reconcile_with_history
+
+result = reconcile_with_history(
+    "Hello world",
+    "Hello beautiful world",
+    "Hi world",
+)
+
+print(result["text"])     # "Hi beautiful world"
+print(result["history"])  #
+# [
+#   {"text": "Hello", "history": "RemovedFromRight"},
+#   {"text": "Hi", "history": "AddedFromRight"},
+#   {"text": " beautiful", "history": "AddedFromLeft"},
+#   {"text": " ", "history": "Unchanged"},
+#   {"text": "world", "history": "Unchanged"},
+# ]
+```
+
+## Tokenization Strategies
+
+`reconcile-text` offers different approaches to split text for merging:
+
+- **Word tokenizer** (`"Word"`) - Splits on word boundaries (recommended for prose)
+- **Character tokenizer** (`"Character"`) - Individual characters (fine-grained control)
+- **Line tokenizer** (`"Line"`) - Line-by-line (similar to `git merge` or more precisely [`git merge-file`](https://git-scm.com/docs/git-merge-file))
+- **Markdown tokenizer** (`"Markdown"`) - Splits on Markdown structural boundaries (headings, list items, paragraphs)
+
+```python
+from reconcile_text import reconcile
+
+result = reconcile("abc", "axc", "abyc", "Character")
+print(result["text"])  # "axyc"
+```
+
+## Cursor Tracking
+
+`reconcile-text` automatically tracks cursor positions through merges, which is useful for collaborative editors. Selections can be tracked by providing them as a pair of cursors.
+
+```python
+from reconcile_text import reconcile
+
+result = reconcile(
+    "Hello world",
+    {
+        "text": "Hello beautiful world",
+        "cursors": [{"id": 1, "position": 6}],  # After "Hello "
+    },
+    {
+        "text": "Hi world",
+        "cursors": [{"id": 2, "position": 0}],  # At the beginning
+    },
+)
+
+# Result: "Hi beautiful world" with repositioned cursors
+print(result["text"])     # "Hi beautiful world"
+print(result["cursors"])  # [{"id": 2, "position": 0}, {"id": 1, "position": 3}]
+```
+
+> The `cursors` list is sorted by character position (not IDs).
+
+## Compact Diffs
+
+Generate and apply compact diff representations:
+
+```python
+from reconcile_text import diff, undiff
+
+original = "Hello world"
+changed = "Hello beautiful world"
+
+# Generate a compact diff
+d = diff(original, changed)
+print(d)  # [5, ' beautiful world']
+
+# Reconstruct the changed text from the diff
+reconstructed = undiff(original, d)
+assert reconstructed == changed
+```
+
+Diff entries are positive integers (retain N characters), negative integers (delete N characters), and strings (insert text).