TS-002: Fix all pre-existing TypeScript errors (27→0)

[sparkling]

Complete module declaration stubs for 7 optional dependencies (@claude-flow/embeddings, guidance, aidefence, shared, mcp, @ruvector/learning-wasm, @noble/ed25519) plus Array.from type casts in embeddings.ts.

Files: types/optional-modules.d.ts, commands/embeddings.ts
Commit: 121efce3e