fix: restore Swift 5.10 CI compatibility

[blackkcold]

Summary

• replace key-path predicates in LUT parsing with Swift 5.10-compatible closures
• use an explicit CharacterSet for whitespace trimming
• prepare the v0.3.2 patch release documentation

Verification

• 13 Swift tests passed locally
• release app built and passed strict code-sign verification
• release ZIP and binary SHA-256 checks passed
• source and app binary privacy scans passed