Extract `@wraith-protocol/sdk-agent` companion package

[truthixify]

Tier: L (5-7 days) | Type: refactor

Context. PR #157 shipped Claude-compatible agent tools inside src/agent/. That pulled Wraith, WraithAgent, Chain, and every agent-specific type into the root @wraith-protocol/sdk bundle, inflating both the surface reviewed by api-extractor and the size of the root entry for consumers who never touch agents. Split it into its own package the way sdk-react split out per-framework hooks, and keep the core @wraith-protocol/sdk root focused on Wraith crypto primitives.

Scope.

• New workspace package packages/sdk-agent/ housing client.ts, tools.ts, types.ts moved from src/agent/.
• Root package re-exports move to a top-level compatibility shim (deprecated in the api-extractor snapshot).
• examples/agent/ and examples/stellar-spectre-agent/ swap to the new package.
• New package documents its adapter shape so third-party agent frameworks (Vercel AI SDK, Mastra) can wire in.

Acceptance.

• @wraith-protocol/sdk root bundle shrinks by the agent module's byte cost (verified via size-limit)
• Old imports keep working with a deprecation warning for one minor
• Agent tests moved under packages/sdk-agent/test/
• Docs in packages/sdk-agent/README.md cover the adapter shape

Files. packages/sdk-agent/ (new), src/agent/ (deleted after shim), src/index.ts, examples/agent/, examples/stellar-spectre-agent/, etc/sdk.api.md.

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