[BREAKING] Cline SDK 0.0.70: plan-mode command blocking, context-overflow recovery, session mode field

The SDK release behind this week's Cline CLI, desktop, and extension builds. Plan mode moves from prompt-based restraint to hard rejection of mutating shell commands, context-window overflow is recovered via deterministic compaction, and `StartSessionInput` gains a `mode` field. Embedders should expect changed tool-error behavior and session persistence timing.

Tool: cline · Version: sdk/sdk/v0.0.70 · Significance: 3/5 · BREAKING CHANGE · breaking, api-change, feature, fix, model-support