feat: publish Regex Tools 0.1.0

docs/EXECUTION_TRACES.md

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+# Execution traces
+
+Version 0.1.0 exposes no execution trace.
+
+Browser ECMAScript APIs return compilation, match, capture and replacement
+results but not the runtime's internal backtracking events. Regex Tools does
+not label structural explanations, static hints or adjacent-result inference
+as an actual engine trace.
+
+The next PCRE2 slice will use actual automatic/explicit callout events from an
+application-owned bridge. Event count, serialized bytes, match/depth/heap
+limits and wall-clock termination must all be enforced. Classifications such
+as “apparent backtrack” will remain visibly derived from adjacent events.