docs(adr): the ProDesk is the sensitive tier's host, rehearsed on first (#404) - #405
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…st (#404) ADR-0008 needed two machines: a mini PC for the sensitive tier and, under #92, a cold spare for the firewall. Only the spare was ever on the shopping sentence in README.md, and the tier's host lost its tracker the day #102 split into one issue per service. One ProDesk 600 G4 was bought on 2026-09-08 for the spare, in the belief it would host the tier too. ADR-0034 decides it does. It is rehearsed on first, as the firewall spare, then wiped and built as the tier host under #404, and it is the firewall's spare hardware in a disaster at the cost of the tier being down until a replacement arrives — a cost ADR-0023 already accepts. The cold spare is deferred with a stated reopen condition. Six cores and 32 GB also fit the tier's real workload better than the "N100-class" box the docs assumed. README's shopping sentence now names every outstanding purchase; the roadmap's #92, #110 and #102 entries, both runbooks that racked the spare powered off, and hardware.md follow. Refs #92, #102, #404. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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ADR-0034 — Run the sensitive tier on the ProDesk, and make it the spare hardware.
ADR-0008 needed two machines and only the firewall spare was ever on the README's shopping sentence; the tier's host lost its tracker when #102 split. One ProDesk was bought on 2026-09-08 for both jobs. This ADR decides it does both, in order: rehearse the firewall restore on it first (the half of #92 that matters), then wipe it and build the tier under #404, and in a disaster it is the spare hardware at the cost of the tier being down until a replacement arrives — a cost ADR-0023 already accepts. The cold spare is deferred with a reopen condition, not bought twice.
Also in this PR
README.md: the top-items sentence names every outstanding purchase (a second drive, the NAS) and says why it used to omit the tier's host.docs/roadmap.md: the Buy a spare ProDesk and rehearse the firewall restore #92, Rack the shelf switch in U4 — buy it with the UPS pack #110 and ADR-0008: the sensitive-tier services and two new firewall rules are untracked #102 entries.restore-the-firewall.md: §3 says the spare is the tier host and step 0 is wiping it; Afterwards says order a replacement the same day; the rehearsal's last step hands the box to Build the sensitive-tier host on the ProDesk (ADR-0034) #404 instead of racking it off.fit-the-ups-battery.mdstep 2 item 4: nothing else racks on the shelf.docs/hardware.md: the box listed as in transit, entering the Compute table when Build the sensitive-tier host on the ProDesk (ADR-0034) #404 builds it.#401, which recorded the same box as the cold spare, is closed unmerged.
Checks:
make check-docs,scripts/lint.sh.Refs #92, #102, #404.
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