Simplify compaction: remove proactive abort, use Agent.continue() for retry

- Add agentLoopContinue() to pi-ai for resuming from existing context
- Add Agent.continue() method and transport.continue() interface
- Simplify AgentSession compaction to two cases: overflow (auto-retry) and threshold (no retry)
- Remove proactive mid-turn compaction abort
- Merge turn prefix summary into main summary
- Add isCompacting property to AgentSession and RPC state
- Block input during compaction in interactive mode
- Show compaction count on session resume
- Rename RPC.md to rpc.md for consistency

Related to #128

packages/ai/src/models.generated.ts

@@ -3275,13 +3275,13 @@ export const MODELS = {
 			reasoning: true,
 			input: ["text"],
 			cost: {
-				input: 0.19999999999999998,
-				output: 0.7999999999999999,
+				input: 0.15,
+				output: 0.75,
 				cacheRead: 0,
 				cacheWrite: 0,
 			},
-			contextWindow: 163840,
-			maxTokens: 163840,
+			contextWindow: 8192,
+			maxTokens: 7168,
 		} satisfies Model<"openai-completions">,
 		"openai/gpt-4o-audio-preview": {
 			id: "openai/gpt-4o-audio-preview",
@@ -4516,8 +4516,8 @@ export const MODELS = {
 			reasoning: false,
 			input: ["text", "image"],
 			cost: {
-				input: 0.049999999999999996,
-				output: 0.22,
+				input: 0.04,
+				output: 0.15,
 				cacheRead: 0,
 				cacheWrite: 0,
 			},