v0.8.0 durable approval queue

Adds a durable approval queue example for persisting pending AI tool-call approvals across process restarts.\n\nHighlights:\n- New examples/durable-approval-queue.mjs JSON-file approval queue\n- New npm run example:durable-queue demo command\n- Tests for restart recovery and demo behavior\n- README, integrations docs, roadmap, and changelog updates\n\nTry it with:\nsh\nnpm install @pallattu/aeg-intent-gate\nnpm run example:durable-queue\n