feat(sona): complete state persistence — loadState() restores patterns (#274)

[ruvnet]

Summary

Completes #274 by implementing the load path for SONA state persistence.

What was missing

PR #284 added saveState() but no loadState(). SONA could serialize its learned patterns but couldn't restore them after a restart.

What this PR adds

Layer	Method	Purpose
Rust (reasoning_bank)	insert_pattern()	Direct pattern insertion for state restore
Rust (coordinator)	load_state(json)	Deserialize JSON and restore patterns
Rust (coordinator)	serialize_state()	Now includes full pattern data (centroids, quality)
NAPI	loadState(stateJson)	Node.js binding
TypeScript	loadState(stateJson)	Wrapper returning count of restored patterns

Full save/load cycle

// Save before shutdown
const state = engine.saveState();
fs.writeFileSync('sona-state.json', state);

// Restore after restart
const json = fs.readFileSync('sona-state.json', 'utf8');
const restored = engine.loadState(json);
console.log(`Restored ${restored} patterns`);

What's still needed (follow-up)

• Brain server: auto-persist SONA state to Firestore after each training cycle
• Brain server: auto-load SONA state on Cloud Run cold start

Files Changed

File	Change
crates/sona/src/reasoning_bank.rs	Added insert_pattern()
crates/sona/src/loops/coordinator.rs	Full serialize_state() + load_state()
crates/sona/src/napi.rs	Added loadState() NAPI binding
npm/packages/ruvector/src/core/sona-wrapper.ts	Added loadState() wrapper

Closes #274

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