refactor(HAI-116): rename kb to hai across all packages, CLI, and docs

- Rename npm packages from @kb/* to @hai/* and update all workspace references
- Rename CLI binary from kb to hai and config directory from .kb to .hai
- Update dashboard UI branding, titles, and references from kb to hai
- Update all test files, CI workflows, and documentation to reflect new naming
- Run comprehensive grep verification to ensure no stale kb references remain

packages/engine/src/index.ts

@@ -5,6 +5,6 @@ export { TaskExecutor, type TaskExecutorOptions } from "./executor.js";
 export { Scheduler, type SchedulerOptions } from "./scheduler.js";
 export { aiMergeTask, type MergerOptions } from "./merger.js";
 export { reviewStep, type ReviewType, type ReviewVerdict, type ReviewResult, type ReviewOptions } from "./reviewer.js";
-export { createHaiAgent, type AgentOptions, type AgentResult } from "./pi.js";
+export { createKbAgent, type AgentOptions, type AgentResult } from "./pi.js";
 export { WorktreePool } from "./worktree-pool.js";
 export { createLogger, type Logger } from "./logger.js";