Release v0.29.0

What's Changed

New Features

• Add JSON encoder extension — a new ext library for JSON encoding by @rohan-patnaik in #1340
• Upstream network.IP/CIDR support from Kubernetes by @tdesrosi in #1238
• Managed execution frame with async call foundations by @TristonianJones in #1316
• Execution frame integration with updated InterpretableV2 by @TristonianJones in #1344
• Add conformance test runner for CEL Policies by @l46kok in #1319

Bug Fixes

• Fix unintentional unwrapping of optionals at any level of depth by @TristonianJones in #1315
• Fix has() unknown propagation during partial evaluation by @0xASTRA in #1324
• Enforce expression size limit before source construction by @thesmartshadow in #1302
• Policy variable scoping fixes by @jnthntatum in #1321
• Emit valid CEL for doubles in scientific notation in the parser/unparser by @moraneus in #1326
• Allow aliases for simple names in containers by @rohan-patnaik in #1327
• Reject out-of-range minutes in timezone offset parsing by @alhudz in #1336
• Validate offset on empty-string path in indexOf and lastIndexOf by @alhudz in #1335
• Guard int32/uint32 map key narrowing in qualifyInternal by @alhudz in #1337
• Add max size check to genRange() in ext/lists to prevent OOM by @marwan9696 in #1310

Cost Tracking

• Ensure receiver and global matches cost estimates agree by @TristonianJones in #1350
• startsWith/endsWith runtime cost agreement with checked cost by @TristonianJones in #1351
• Avoid repeated construction of cost tracker by @pohly in #1357

Testing & Tooling

• Test Runner usability improvements by @jnthntatum in #1320
• Minor updates to test coverage and code quality by @TristonianJones in #1318
• Remove duplicate policy tests now covered by policy conformance tests by @l46kok in #1332
• Minor Google3 import fixes by @l46kok in #1331

Documentation

• Update documentation for nested first-match rules by @jnthntatum in #1323
• Add migration warning to README by @dmitriplotnikov in #1330