docs(rack): buy 2U four-post rails for mjolnir, and retire two rows already on hand

[Gerrrt]

What changed

Docs only, no change to the running lab. A 2U four-post rail pair for mjolnir joins Everything still to buy: the rails the UPS sits on now sag under it, and hardware.md had already said it needs rear support. Rack Solutions 2UKIT-109 is named in the row for its 10–31.75" range, 75 lb rating and 18-gauge steel. Two bought rows leave: the short patch leads in the VLAN colours and the spare M6 cage nuts, which the operator already has. Eleven rows become ten and README's count follows. hardware.md's frame paragraph and U1–U2 row, and the move runbook's §0.1, its list of what moves over and its §6 row for the UPS, say the same: the old rails stay out. Changelog entry dated 2026-10-16.

Stacked on #1200 (its base), which is stacked on #1199, so it shows only this change until those merge.

Why

Refs #919. The operator reported the UPS's present rails sagging on 2026-10-16 and that the patch leads and cage nuts are on hand. The roadmap's rule is that a purchase enters or leaves only through its table, in the same PR as the fact that changes it.

Blast radius

None: documentation only.

• No change to network segmentation or firewall rules
• No new port published to a VLAN that could not already reach the service
• No credential added outside secrets/*.sops.yaml

Verification

• python3 scripts/check_docs.py: docs OK — 158 Prometheus + 20 Loki rules, 8 dashboards, 156 panels, 12 assertions (the purchase count is among the assertions).

• ./scripts/lint.sh: every check PASS.

• make validate: all checks passed (5 skipped — NOT run, not verified). The five skips are the worktree ones: the offsite path refusal (CI covers it), unit syntax, installed timers, the sensitive stack's timers and the homelab-* units, none of which this checkout serves. Lint ran without --require-all; CI runs the hardened boots, the secret scan and the close-keyword check too.

• python3 scripts/check_close_keywords.py --text on this body: clean.

• make validate passes

• Deployed to the lab and confirmed working (nothing to deploy)

• Docs updated (docs/, service README, or docs/roadmap.md)

🤖 Generated with Claude Code

[Copilot]

🟢 Approval recommended

The five documentation files consistently reflect the purchase decisions, with no unresolved findings.

0 open findings

What changed in this PR

Updates rack-move documentation to replace mjolnir’s sagging UPS rails, with no running-lab changes.

Changes:

• Adds a new 2U four-post rail pair to outstanding purchases.
• Removes patch leads and cage nuts already on hand, reducing purchases from eleven to ten.
• Aligns hardware plans and move instructions, and records the decisions.

File	Description
README.md	Updates the outstanding purchase count to ten.
docs/​runbooks/​move-into-the-32u-rack.md	Requires replacement UPS rails and updates supplies.
docs/​roadmap.md	Adds UPS rails and removes two acquired items.
docs/​hardware.md	Documents sagging rails and planned replacement.
docs/​changelog.md	Records the purchase-list changes.

🧠 Review effort: Balanced

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