docs: the moved documents live on the documentation site

INSTALL.md, SERIAL.md, docs/COOLING.md, docs/LIGHTBURN.md,
docs/MOTION.md, docs/SAFETY.md, docs/UPDATE-SYSTEM.md, docs/VIDEO.md and
their images are pages on https://docs.forgefirm.org/ now. Every
reference in the README, BRINGUP, the kas config, the cold-build
workflow, forgetest, and the bench scripts points to the site page. The
README carries the beta banner. docs/ keeps BRINGUP.md and
CAMPAIGN-LOG.md.

No catalog consequence: the deleted files are documents, and the code
changes are comment and help-text repoints only.

scripts/bench/README.md

@@ -40,7 +40,7 @@ page's takeover does that; from a host, stop them first.
 | `flow_characterize.py` | Coolant flow characterization using the factory temperature curve (board or host; forgectrl and controller stopped): baseline → flow → no-flow → recovery, printing the ΔT bands and their separation. Takes the heater duty as an argument (`flow_characterize.py 30`); aborts if downstream passes 45 °C. |
 | `flow_matrix.py` | **The flow-detection design matrix** (board or host; forgectrl and controller stopped; with `flow_sampler.py` from `/usr/share/forgetest/bench/`): duty × duration × flow/no-flow, every run from a common cooled baseline, interleaved repeats. One heating trace yields the metric at every candidate duration, so cost and precision come from the same 60 runs. Prints a cost table, a precision table (mean±sd, worst-case margin, d′) and a ranked shortlist. `flow_matrix.py [duties] [repeats]` (or env `FM_DUTIES`, `FM_REPEATS`, `FM_RESULTS`); results/log in the bench data directory, resumable. |
 | `flow_sustained.py` | Long-run test of the real re-check cadence via M8 (board or host; controller running): counts verdicts/false faults against the configured `cool_flow_rise` and tracks whether the loop accumulates heat. `flow_sustained.py [minutes]`. |
-| `temp_calibrate.py` (`supply-*` modes) | The power supply's sensor (`pic/pwr_temp`, raw) against a thermometer on its heatsink: `supply-watch`, `supply-point <C>`, `supply-fit`; the fit is printed beside `UAPI.md`'s unverified guess. Three points during a long cut settle it. |
+| `temp_calibrate.py` (`supply-*` modes) | The power supply's sensor (`pic/pwr_temp`, raw) against a thermometer on its heatsink: `supply-watch`, `supply-point <C>`, `supply-fit`; the fit is printed beside the documented unverified guess ([sensors](https://docs.forgefirm.org/technical/machine/sensors/)). Three points during a long cut settle it. |
 | `critical_tier_drill.py` | The coolant critical tier on a rising temperature (board or host): sets the ceiling, the resume gate and the critical line a few tenths above the live upstream reading and lets the engine's own flow-check heater warm the loop through them inside one `M8` session, expecting `OVERTEMP` at the ceiling and then `CRITICAL` (fire blocked, hold, no resume) with the fault ending at `M9`; restores the settings and cycles a session so the engine re-reads them. Results as JSON in the bench data directory. |
 | `aa_offset_check.py` | Coolant offset correction under the run airflow (board; controller running; dark, no press): M8 brings the fans to the run profile while the raw coolant counts, `/status` and the engine's readings are averaged before, during and after; with `cool_aa_offset_counts` at the machine's value the readings hold still while the raw counts step, at zero they drop by about a degree. `aa_offset_check.py [dwell_s]`. |
 | `offset_probe.py` | Coolant-sensor offset probe (board; forgectrl idle; dark, no press): switches one actuator at a time (exhaust at 100/50/25 %, intakes, air assist, purge, heater, pump, TEC, lid lamp, then all run fans) with both thermistors sampled at 25 Hz and scores the common-mode step at every edge and the level toggling inside every dwell; `offset_probe.py ladder` runs the air-assist duty ladder alone. Every value is restored on exit. JSON record in the bench data directory. |