20261019-1200-switch-docs-current-state Rewrite the P05 Switch product documents to state the current design only

• status: completed
• createdAt: 2026-10-19 12:00
• approvedAt: 2026-10-19 12:00 (owner chose option 2: "2")
• relatedTask: 20261019-1200-switch-docs-current-state

Context

About 180 body lines across 17 pages carry change narratives; most are in the Air Hub spec (50), the Air Hub reference-board page (31), the Air and Air Hub design appendices (18 each) and the Air spec (14). The documentation standard requires every controlled page to end with a ## 变更记录 table, so the history stays there and only the body is rewritten.

Steps

1. Air Hub: spec, design appendix, reference-board page, guide, brief, EMC evaluation.
2. Air: spec, design appendix, guide, brief.
3. Key and the Switch line: spec, design appendix, guide, brief for each.
4. One change-log row and a version bump per changed controlled page.
5. Quality gate; refresh the handover copies in /srv/ybo/switch/handover/.

Risks

• A design appendix explains choices by comparison; rejected options stay as "未采用" with a reason so the rationale is not lost.
• Cross-references to removed sentences: checked by lint and by searching for anchors.