feat: add local KMS key store (IKmsClient for on-premise deployments) #81

Job	Run time
Build & Test (ubuntu-24.04)	3m 24s
TSan (Ubuntu)	3m 29s
UBSan (Ubuntu)	2m 32s
Server Codecs (Ubuntu)	4m 55s
Fuzz (Ubuntu, Clang-18)	30m 52s
ASan + UBSan (Ubuntu)	3m 49s
Benchmark Registry	4s
Build & Test (macos-14)	2m 12s
Build & Test (Windows / MSVC)	5m 5s
Post-Quantum PQ (Ubuntu)	4m 36s
Python SAST (bandit)	9s
License Compliance	1m 25s
Coverage (Ubuntu, Clang-18)	3m 5s
Mutation Testing Baseline (Ubuntu)	2m 11s
Secrets Scan (gitleaks)	7s
Full Suite 394/394 (Ubuntu)	5m 12s
Benchmarks (Ubuntu)	2m 26s
	1h 15m 33s

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