2026-05-14: Doc site consistency fixes

Problem

Several inconsistencies discovered in the doc site after v1.2.1 was shipped:

1. Sidebar not reversed: Individual release note files had sidebar: order: X frontmatter overriding reversed: true in astro.config.mjs. Same issue in two plan files.
2. Release note title inconsistency: Older files used "Release Notes — v1.X.X" prefix; v1.2.1 used plain "v1.2.1".
3. Badly named plan file: 2025-01-beta-feedback-plan.md (missing day DD) was a duplicate of the correctly named 2026-05-01-beta-feedback-plan.md.
4. Plans index.md had no table: Unlike releases/index.md which lists all releases, plans/index.md had only a brief description.
5. dev-setup.md still mentioned Node 22: Tip header (Node >=22 LTS — Node 24 recommended) and line 103 (Node ≥ 22 — already required) were still pointing to Node 22.

Plan

• F1 Remove sidebar: order: from v1-0-0, v1-1-0, v1-1-1, v1-1-2, v1-2-0 + 2026-05-01-beta-feedback-plan.md
• F2 Standardize all release titles to "v1.X.X" (5 files)
• F3 Delete 2025-01-beta-feedback-plan.md (badly named duplicate)
• F4 Rebuild plans/index.md with full table of all plans, newest first
• F5 dev-setup.md: update tip header + line 103 to say Node 24

AGENTS.md Checklist

#	Convention	Status
1	Doc site IS the deliverable	✅
2	All 4 test gates	⏭ No code change
3	Self-review complete	✅
4	Endpoint coverage	⏭ N/A
5	Bug-to-Test	⏭ N/A
6	Seed isolation	⏭ N/A
7	Transaction invariants	⏭ N/A
8	Plan history	✅ This file
9	cd docs && npm run build before + after	✅
10	Local Node 24, no Docker	✅
11	Baseline before changes	✅ Passed (73 pages)
12	Execution summary	✅ Below
13	Doc Grep Rule	⏭ Changes ARE the docs
14	Patch release v1.2.2	✅

Execution Summary

Commit: TBD

Actual changes

• releases/v1-0-0.md, v1-1-0.md, v1-1-1.md, v1-1-2.md, v1-2-0.md — removed sidebar: order: block + updated title to "v1.X.X" format
• plans/2026-05-01-beta-feedback-plan.md — removed sidebar: order: block
• plans/2025-01-beta-feedback-plan.md — deleted (badly named duplicate)
• plans/index.md — rebuilt with full table listing all 36 plans newest-first
• dev-setup.md — tip header + line 103 updated to Node 24

Deviations from plan

None.

Test results

Gate	Result
Docs build (baseline)	✅ 73 pages
Docs build (after)	✅ 73 pages (1 deleted + 1 created = net 0)
Backend unit	⏭ Not affected
Backend e2e	⏭ Not affected
Frontend unit	⏭ Not affected
Frontend e2e	⏭ Not affected

Key discoveries

• sidebar: order: in individual files silently overrides reversed: true in astro.config.mjs — this was the root cause of sidebar ordering not working.