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David Snelling bb4c0bfb99 fix: add NULL hash guards to prevent v5.3.3 regression 
Fixed critical bug where CommitObject.walk() didn't guard against NULL parent
hash, causing "Blob metadata not found: 0000...0000" error when calling
getHistory() on fresh databases.

This is a SYSTEMATIC fix, not just a patch:

Infrastructure:
- src/storage/cow/constants.ts: NEW - NULL_HASH constant and utilities
- Prevents hardcoding errors
- Provides isNullHash() for semantic checks

Bug Fixes:
- src/storage/cow/CommitObject.ts: Guard NULL parent in walk()
- src/storage/cow/BlobStorage.ts: Defensive check rejects NULL hash reads
- src/storage/baseStorage.ts: Use NULL_HASH constant (not hardcoded)
- src/brainy.ts: Use NULL_HASH constant (not hardcoded)

Testing:
- tests/integration/initial-commit-null-parent.test.ts: 5 regression tests
- All 17 tests pass (5 new + 12 existing COW tests)
- Zero regressions

This fix addresses the root cause of 4 consecutive bugs (v5.3.0-v5.3.3):
missing defensive programming for sentinel values in COW storage.

Fixes: Workshop team bug report (v5.3.3 regression)
Tests: 17/17 pass (5 new regression + 12 existing COW)
Build: SUCCESSFUL (zero errors)
2025-11-04 15:39:58 -08:00
..
api feat: Brainy 3.0 - Production-ready Triple Intelligence database 2025-09-11 16:23:32 -07:00
augmentations/intelligentImport feat: add intelligent import for CSV, Excel, and PDF files 2025-10-01 16:51:03 -07:00
benchmarks feat: remove legacy ImportManager, standardize getStats() API 2025-10-09 11:40:31 -07:00
comprehensive fix: resolve 10 test failures across clustering, metadata, and deletion 2025-10-09 16:33:08 -07:00
configs 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
fixtures/import feat: add intelligent import for CSV, Excel, and PDF files 2025-10-01 16:51:03 -07:00
helpers feat: Brainy 3.0 - Triple Intelligence Release 2025-09-15 11:06:16 -07:00
integration fix: add NULL hash guards to prevent v5.3.3 regression 2025-11-04 15:39:58 -08:00
manual fix: update tests for v5.1.0 API changes (VFS auto-init + property access) 2025-11-02 11:38:12 -08:00
performance docs: remove exaggerated performance claims and add honest benchmarks 2025-10-28 09:54:01 -07:00
scripts feat: Brainy 3.0 - Production-ready Triple Intelligence database 2025-09-11 16:23:32 -07:00
unit test: fix flaky timing assertion in image-handler test 2025-11-04 13:07:23 -08:00
vfs fix: update VFS test for v5.2.0 BlobStorage architecture 2025-11-03 14:08:58 -08:00
brainy-3.test.ts fix: resolve 10 test failures across clustering, metadata, and deletion 2025-10-09 16:33:08 -07:00
critical-error-handling.test.ts feat: Brainy 3.0 - Production-ready Triple Intelligence database 2025-09-11 16:23:32 -07:00
critical-neural-validation.test.ts feat: Brainy 3.0 - Production-ready Triple Intelligence database 2025-09-11 16:23:32 -07:00
critical-performance-benchmark.test.ts feat: Brainy 3.0 - Production-ready Triple Intelligence database 2025-09-11 16:23:32 -07:00
distributed-demo.test.ts feat: Brainy 3.0 - Production-ready Triple Intelligence database 2025-09-11 16:23:32 -07:00
model-loading.test.ts 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
opfs-storage.test.ts 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
package-size-breakdown.test.ts 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
package-size-limit.test.ts 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
setup-integration.ts 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
setup-unit.ts 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
setup.ts 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
streaming-pipeline.test.ts feat: Brainy 3.0 - Production-ready Triple Intelligence database 2025-09-11 16:23:32 -07:00
type-utils.test.ts 🧠 Brainy 2.0.0 - Zero-Configuration AI Database with Triple Intelligence™ 2025-08-26 12:32:21 -07:00
typeAwareHNSWIndex.test.ts feat: Phase 2 Type-Aware HNSW - 87% memory reduction @ billion scale 2025-10-15 15:39:28 -07:00
typeAwareQueryPlanner.test.ts feat: Phase 3 - Unified Semantic Type Inference (Nouns + Verbs) 2025-10-16 10:59:26 -07:00