chore(main): release 1.6.0

[github-actions]

🤖 I have created a release beep boop

1.6.0 (2026-04-16)

Features

• compute: T1.2 add ensureNotCapturing guard and ErrCaptureIncompatibleAllocation (18e1f5a)
• compute: T2.1a add WithCapture helper for capture-aware graph lifecycle (d60c902)
• compute: T2.2 capture-aware allocWeight routing via cudaMallocAsync (2a723b7)
• compute: T2.3 pre-allocate workspace buffers at UploadWeights to avoid capture-time alloc (9f9eb5c)
• cuda: T1.1 add StreamCaptureStatus purego binding (879cbc9)
• graph: T4.1 add capture watchdog with 30s timeout and status sampling (b3066a5)
• graph: T99.1.2 mark Gemma4PLECombinedProducer non-capturable (6c855a9)

Bug Fixes

• graph: T98.2.3 don't pool-release pass-through node inputs (6ecf8db)

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