feat: AgentEvent types, Decimal monetary fields, brand unification

[luokerenx4]

Summary

Three significant changes that touch core infrastructure:

1. AgentEvent type system (5fde2d1) — 8 files, +378/-12

Introduces AgentEventMap, a typed registry that maps event type strings (e.g. cron.fire, heartbeat.done, message.received) to their payload interfaces. Each event type gets:

• Compile-time safety — EventLog.append() now has typed overloads, so payloads are checked at the call site
• Runtime validation — TypeBox schemas compiled to Ajv validators, so malformed payloads are caught before they hit the log
• Typed subscriptions — subscribeType('cron.fire', cb) gives the callback a properly typed payload, removing all manual as casts

All existing consumers (CronListener, Heartbeat, SnapshotScheduler, ConnectorCenter) migrated to typed API. Also adds a trigger event type for future webhook/API ingest.

2. Decimal monetary fields (dbe3535) — 31 files, +405/-389

Eliminates IEEE 754 floating-point artifacts (e.g. 0.30000000000000004) from all monetary fields across the entire trading stack. This is a breaking interface change:

• Position.avgCost, marketPrice, marketValue, unrealizedPnL, realizedPnL → number to string
• AccountInfo.netLiquidation, totalCashValue, buyingPower, etc. → number to string
• GitState, AggregatedEquity, UTASnapshot — all monetary fields follow
• All broker implementations (CCXT, Alpaca, IBKR, Mock) now use Decimal arithmetic internally and output .toString()
• IBKR SDK decoder updated: updatePortfolio callback passes string values via decodeDecimal() instead of decodeFloat(parseFloat)
• Frontend (PortfolioPage, api/types.ts) updated to consume string values

3. Brand unification (7a7f586) — 11 files, +19/-19

Replace all instances of "Open Alice" (with space) with "OpenAlice" (no space) for consistent branding and SEO. Covers README, CLAUDE.md, CONTRIBUTING, CHANGELOG, package.json, UI title/sidebar, cliff.toml, and ibkr DESIGN.md.

Test plan

• pnpm test — unit tests pass (especially agent-event, event-log, TradingGit, guards, broker, fx-service specs)
• npx tsc --noEmit — no type errors from the number→string migration
• Verify portfolio page renders monetary values correctly (no NaN, no floating-point artifacts)
• Verify event log accepts typed events and rejects malformed payloads
• Check "OpenAlice" branding appears correctly in UI sidebar and browser tab

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