docs: document resource lifecycles and native interaction verification

[GCWing]

Summary

Document the implemented resource lifecycle contracts for inactive editor views, FlowChat history, retry grouping, and peer history prefetch. Add the focused native WebDriver regression command and its storage isolation and coverage limits to the owning AGENTS guides in English and Chinese.

The history guide states the durable eviction policy without the temporary experiment narrative. These seven files provide development instructions and module contracts for already-merged behavior.

Type and Areas

Documentation. WebDriver, editor, FlowChat, peer-device, and E2E guides.

Verification

• Reviewed the documentation against the existing implementation and verified the documented focused test entry points exist.
• git diff --check origin/main...HEAD passed.
• git merge-tree --write-tree origin/main HEAD passed.
• node scripts/check-git-object-sizes.mjs --base origin/main --head HEAD passed.
• Build-impact classification checked with resolved base/head commit SHAs.

AI-assisted documentation change. Runtime, browser, native visual, and remote scenario tests were not rerun for this documentation-only PR.

Reviewer Notes

Prepared directly on gcwing/dev. The diff contains only four AGENTS guides and three module documents; it includes no standalone audit reports or planning artifacts.

Checklist

• Scope contains durable documentation only.
• Relevant validation and its limits are recorded.
• Native interaction instructions are provided in both E2E guide languages.