Swap the hand-rolled API mirror for the SDK 0.8.1 generated client

[hbrooks]

Important

Replaces the hand-rolled API client with the SDK 0.8.1 generated client, delegating all REST operations to the SDK rather than maintaining a parallel mirror of the API surface.

• API Client: The ~494-line ApiClient class is removed from src/lib/api.ts and replaced with an api() function that returns an Ellipsis SDK client instance. All 20+ command files now call api().analytics.metrics(), api().agents.configs.list(), api().files.get(), etc. instead of instantiating and calling methods on ApiClient.
• Type System: Hand-rolled request/response types (analytics metrics/pull-requests/reviews responses, file shapes, review types, CLI auth types) are removed from src/lib/types.ts. Types now come from the SDK-generated schema (@ellipsis-dev/sdk), re-exported under CLI-specific names to catch API renames as type errors rather than silent undefined fields.
• Error Handling: Updated to use the SDK's APIError class instead of the custom ApiError. Added errorDetail() and describeApiError() helpers to extract the server's message and request ID from SDK errors for terminal output.
• Dependencies: @ellipsis-dev/sdk bumped from 0.6.0 to 0.8.1 in package.json and bun.lock.
• Code reduction: 2269 lines deleted, 816 added (net ~1453 lines removed).

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[ellipsis-dev]

Important

Looks good to me! 👍

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