fix: address PR review issues for schematic analysis tools

Eliminate repeated file parsing by extracting _extract_lib_symbols helper
that walks already-parsed sexp_data once instead of re-reading the file
per symbol via PinLocator. Support diagonal wire overlap detection using
cross-product parallelism and 1D projection. Fix wire region inclusion to
use AABB intersection for pass-through wires. Normalize view region
coordinates. Clarify tolerance docstrings across Python, TS, and schema.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

python/schemas/tool_schemas.py

@@ -1754,7 +1754,7 @@ SCHEMATIC_TOOLS = [
                 },
                 "tolerance": {
                     "type": "number",
-                    "description": "Distance in mm below which elements are considered overlapping (default: 0.5)"
+                    "description": "Distance threshold in mm for label proximity and wire collinearity checks. Symbol overlap uses bounding-box intersection. (default: 0.5)"
                 }
             },
             "required": ["schematicPath"]