docs: refresh space autonomy gap analysis to April 20

[lsm]

Refresh the gap analysis doc (docs/space-autonomy-hitl-gaps-claude-opus-4-6.md) against the current codebase after significant changes landed April 15–20.

Status changes (5 gaps moved):

• fix: resolve release CI failures #4 (execution autonomy): significantly addressed — agent prompt gating, 3 action types, channel-router auto-approval
• fix: use subshells in publish step #7 (Room/Space unification): partial — Space upgraded to 5-level with shared workflow-autonomy.ts; Room still binary
• fix: make publish steps idempotent for re-runs #10 (conditional branching): partial — implicit via gate requiredLevel + completion-action gating
• chore: add Apache 2.0 license #13 (dead loop detection): prerequisite landed, ready to implement
• chore: bump version to 0.1.1 #18 (task retry RPC): partial — daemon-internal retry exists, missing RPC handler + UI

Doc additions:

• Architecture summary expanded to cover 4 enforcement surfaces
• Gap Rename Liuboer to NeoKai #1 updated: Full-Cycle → Plan & Decompose, Coding with QA workflow, mcp_call/instruction action types
• Infrastructure changes table with 14 PRs and 12 new files documented
• Key files reference expanded from 22 to 36 entries