Retain cumulative task execution evidence beyond history retention

[sunrioa]

Long tasks can exceed the 512-event history window, leaving clients unable to verify an otherwise completed task. Persist a runtime-owned cumulative execution aggregate with each task transition, expose its contract in Agent info, and add the Java SDK's exact-revision human-completion call.

The aggregate retains action, outcome, macro and completion counts, selected capabilities and the latest terminal operation. Task snapshot v7 reads v3–v6; truncated legacy history is explicitly incomplete rather than reconstructed as authoritative evidence. The HTTP schema and English/Chinese runtime documentation describe the new fields.

Validation:

• go test ./... passed.
• Java SDK compilation and RinSdkTest passed.
• Regression coverage includes 300 actions surviving history retention and SQLite reopen, defensive copies, legacy migration, macro accounting and invalidated intents.
• The Minecraft consumer passed both real-process integrations against this commit, including explicit player review before macro completion.