docs(hardware): Pi 4 bring-up gotchas learned live + soak-check printf fix - #452
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…a soak-check printf fix 1) cgroup fix needs a RECREATE, not just a reboot (restart policy resurrects unfenced containers; no-diff up -d recreates nothing). 2) LAN listening = scheme-prefixed PUBLIC_HOST (bare hostname gets auto-HTTPS + self-signed cert = unreachable off-box). 3) soak-check's refill-hold line printed the value twice (6.8s6.8) — expansion order fixed.
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Three real catches from tonight's mjolnir bring-up, written down while warm: 🍓
up -drecreates nothing. Thedown→ relaunch →inspectverify sequence is now in step 2 (piper fence must read 805306368).PUBLIC_HOST(orlocalhost) = Caddy auto-HTTPS with a self-signed cert = stream unreachable off-box.PUBLIC_HOST=http://<lan-name>turns it off; stream athttp://<lan-name>/stream, radios tune it directly. Public boxes keep the bare-domain form.tools/soak-check.shrefill-hold line printed6.8s6.8(both parameter expansions emit when set) — fixed; caught on mjolnir's checkpoint zero, which otherwise PASSED: throttled=0x0 at 60.8°C with api at 207% enrichment load, boot ladder exactly 5, stream live, fences real.