v1.1.1 — ThreadLocal concurrency fixes + CI smoke test

Performance

• ThreadLocal<SecureRandom> — eliminates lock contention under concurrent load
• DateTimeFormatter static constants — 15 generator files, no per-call pattern parsing
• ThreadLocal<Mac> — HmacSHA256 in FinancialMarketsGen, MetaGen
• ThreadLocal<MessageDigest> — SHA-256/SHA-512 in CryptoFuzzGen, EcCrypto

CI

• 426-sampler JMeter smoke test on every PR (all types, blocks merge on failure)
• GitHub Step Summary for JUnit + JMeter results
• Branch protection: build (17/21/25) + jmeter-smoke required