docs(handoff): both ranks shipped — and the fan/AIO tuning question answered (no Linux-side control exists)

[ZacxDev]

Updates claudedocs/handoff-nct6683-bar-integration.md in place. Both ranks are merged (#1411, #1430) and both hosts are converged and verified at a2b74e4b, so this closes the effort.

What the doc now carries that it did not:

• The fan/AIO tuning answer, with the measurements. Under load 96 on 24 cores, Tctl is 81–83 °C against a ~95 °C Tjmax — the CPU is power-limited, not thermally limited, so better cooling buys nothing. And nct6683 exposes PWM read-only (no pwm*_enable, pwm1 not writable, the module's only parameter is force, a vendor-detection override), so a fan-curve daemon is impossible — tuning is BIOS-only. The one real finding is that the case fan sits at a flat pwm3=153 (60%) across every sample, loads 60→96 and temps 71→83 °C.
• Three gotchas that cost real time this session — home.file giving each file its own store path (so .resolve() breaks sibling loading); a .pyc in the config dir outliving every same-size redeploy because store paths have mtime=1; and cbreak leaving ISIG on so Ctrl-C only works in the tty's foreground process group.
• A near-miss worth keeping: git fetch does not move your local branch head. A worktree still at 9ae4fdb4 merged with origin/main and silently dropped a subagent's 170 lines; only the non-fast-forward rejection stopped it landing.

Honest about gate coverage: #1430's pytest tier timed out twice at 3600s with zero failing tests (box at load 70–96), so its coverage was assembled as 22-of-29 targets in one run plus the remaining 7 run directly. The nix sandbox tier was never run on that tree. Post-merge, origin/main content re-runs green (99 passed; 129 across all three fan suites, verified while writing this).

All four ranked next-steps are forcing: none — deliberately. Nothing external is asking for them, and rank 1 (a case-fan RPM floor) is explicitly conditional on the BIOS-curve decision in rank 2.

🤖 Generated with Claude Code

https://claude.ai/code/session_019LDvGed1jgLsz2UXSZNTdm