feat: Add AgentDriver, test fixtures, and Cline SDK spike

[yava-code]

• Added AgentDriver conformance contract as specified in docs/v0.2/ADR-001-agent-runtime.md.
• Created disposable TypeScript test fixtures in extension/test/agents/fixtures.ts that simulate a basic multi-module task with a package.json for agent testing without polluting the actual workspace.
• Spiked the @cline/sdk by implementing ClineDriver (which implements the AgentDriver interface) and created Vitest tests asserting its core functionality, completing Phase 1 constraints.
• Avoided changes to UI or legacy v0.1 behaviors.

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PR created automatically by Jules for task 12541139021210711205 started by @yava-code

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