feat(flags): add semver targeting to local evaluation (#3186)

* add semver targeting to local evaluation

* chore: add changeset for semver operators

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

* fix: address PR feedback for semver operators

- Remove unreachable dead code by replacing nested switch with individual
  case blocks for each semver comparison operator
- Add explicit digit-only check in parsePart to reject malformed versions
  like '1.2.3alpha' (parseInt would silently truncate to 3)
- Add test case for malformed version strings with trailing characters

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

---------

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

Author: dmarticus

.changeset/add-semver-operators.md

@@ -0,0 +1,5 @@
+---
+'posthog-node': patch
+---
+
+Add semver comparison operators to local feature flag evaluation: semver_eq, semver_neq, semver_gt, semver_gte, semver_lt, semver_lte, semver_tilde, semver_caret, and semver_wildcard