#21601: docs: mission control v1 proposal (read-only scope)

## Summary This PR adds a short proposal document for Mission Control v1. - Related issue: #21600 - Prototype implementation: https://github.com/frank8ai/openclaw-mission-control ## Scope - read-only operational overview - runs/failure aggregation - filtering/search/time-range - v2 control actions intentionally deferred No runtime behavior is changed in this PR. <!-- greptile_comment --> <h3>Greptile Summary</h3> Adds a proposal document for Mission Control v1, a read-only operational dashboard for OpenClaw. The proposal outlines a low-risk, incremental approach focusing on runtime visibility (tasks, cron, sessions, subagents) and failure aggregation, while explicitly deferring control actions to v2. No code changes included. <h3>Confidence Score: 5/5</h3> - This PR is safe to merge with minimal risk - documentation only with no runtime changes - This is a documentation-only PR adding a proposal document. No code is modified, no runtime behavior is affected. The proposal itself is well-structured, clearly scoped, and follows a sensible incremental approach by deferring risky control actions to v2. - No files require special attention _{Last reviewed commit: f911ad3} <!-- greptile_other_comments_section --> _{(2/5) Greptile learns from your feedback when you react with thumbs up/down!} <!-- /greptile_comment -->