feat: add universal action parser for DSL, JSON, and BenchmarkAction formats (#4)

Adds openadapt_types.parsing module with five public functions:
- parse_action(): auto-detect format (DSL or JSON) and parse
- parse_action_dsl(): parse DSL strings like CLICK(x=0.5, y=0.3)
- parse_action_json(): parse JSON with canonical, flat, and coordinate formats
- from_benchmark_action(): convert BenchmarkAction-style dicts to Action
- to_benchmark_action_dict(): convert Action back to BenchmarkAction dict

Handles Thought:/Action: prefixes, markdown fences, coordinate normalization
detection, clamping, and legacy field mapping. All edge cases return
Action(type=DONE) with a logged warning instead of raising.

Includes 66 tests covering DSL, JSON, auto-detect, and BenchmarkAction
round-trip conversion.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: abrichr

openadapt_types/__init__.py

@@ -35,6 +35,13 @@
 )
 from openadapt_types.episode import Episode, Step
 from openadapt_types.failure import FailureCategory, FailureRecord
+from openadapt_types.parsing import (
+    from_benchmark_action,
+    parse_action,
+    parse_action_dsl,
+    parse_action_json,
+    to_benchmark_action_dict,
+)
 
 __version__ = "0.1.0"
 
@@ -56,4 +63,10 @@
     # failure
     "FailureCategory",
     "FailureRecord",
+    # parsing
+    "from_benchmark_action",
+    "parse_action",
+    "parse_action_dsl",
+    "parse_action_json",
+    "to_benchmark_action_dict",
 ]