[DIFF] WebAssembly plugin system — run user-defined functions inside the engine

[ElioNeto]

Differentiator

No other embedded KV store has WASM plugin support. This would be a first-of-its-kind feature.

Description

Users write Wasm modules (in Rust, Go, C, etc.) that run inside ApexStore as transform hooks, validation hooks, trigger hooks, or custom aggregators. Sandboxed execution via wasmtime.

apexstore-cli wasm deploy my_filter.wasm --hook on_write

Impact

• First embedded KV store with plugin system
• Extensible without modifying engine code
• Secure sandboxed execution

[ElioNeto]

Implemented in commit 0871d91.