docs(0.4): refresh final main checkpoint

[ael-dev3]

What changed

Refresh the current 0.4 checkpoint across the agent index, execution handoff, integration evidence, release engineering, release freeze, workflow audit, and operations docs.

• Align all 13 docs to protected main 4acd1e22a71cc4c454b26fb762bf8301f40d660a.
• Record passed main Verify 34911650804, CodeQL 34911650722, and Pages classifier 34915001912.
• State accurately that sealed-launch policy skipped Pages build, deploy, recovery, notification, and live verification; 0.4 remains unshipped.
• Preserve the paused sync automation and repository-only artifact/no-Desktop-output workflow.

No runtime code, workflow, credentials, assets, or deployment state changed. Focused documentation tests pass (8/8); git diff --check is clean. The signed branch head is GitHub-verified.