Add lamp comparison export with TM-30 computation

lamp_export.py writes the per-lamp bundle consumed by the buildfor.life
comparison pages: spd.csv (full 380-1050 nm spectrum), tm30.csv (ANSI/IES
TM-30-18 hue-bin data for the color vector graphic), and metrics.json
(photometric, colorimetric, CRI R1-R15, TM-30 Rf/Rg, electrical, supply
settings).

- tm30.py computes TM-30-18 via colour-science from the measured spectrum,
  resampled to a uniform 1 nm grid; validated against CIE FL2 (Rf 70, Rg 86)
- Optional built-in PSU control (--mode/--voltage/--frequency/--current),
  switched on for the measurement and off afterwards, with --settle warm-up
  and --interval between readings
- Readings use the vendor single-shot cycle verified from USB captures:
  test config -> trigger (8C 0E 02) -> poll -> read -> reset per reading
- Also supports --passive and --parse <pcap> sources

README.md

@@ -14,6 +14,10 @@ vendor software for measurement automation and data extraction.
 - **Power supply**: Control the built-in AC (100-240V, 50/60Hz) and DC
   (1-60V, 0-5A) power supply
 - **Export**: CSV output for data logging
+- **TM-30**: ANSI/IES TM-30-18 Rf, Rg, and hue-bin data computed from the
+  measured spectrum (via colour-science)
+- **Lamp bundles**: one-command export of spectrum + TM-30 + metrics for the
+  [buildfor.life lamp comparison](https://buildfor.life/comparisons)
 
 ## Quick Start
 
@@ -58,6 +62,34 @@ uv run hpcs6500.py --psu-off
 uv run hpcs6500.py --integration 500
 ```
 
+## Lamp Comparison Export
+
+Produces the per-lamp data bundle consumed by the buildfor.life comparison
+pages: `spd.csv` (full 380-1050 nm spectrum), `tm30.csv` (TM-30-18 hue-bin
+data for the color vector graphic), and `metrics.json` (photometric,
+colorimetric, CRI R1-R15, TM-30 Rf/Rg, electrical).
+
+```bash
+# Single reading from the device
+uv run lamp_export.py --name philips-a60-8w --manufacturer Philips --model "A60 8W 927"
+
+# Average several readings
+uv run lamp_export.py --name philips-a60-8w --readings 5
+
+# Power the lamp from the built-in supply: 230 V / 50 Hz, 60 s warm-up,
+# PSU switches on before the readings and off afterwards
+uv run lamp_export.py --name philips-a60-8w --voltage 230 --frequency 50 --settle 60
+
+# From an existing pcap capture
+uv run lamp_export.py --name some-lamp --parse captures/run.pcap
+```
+
+Output lands in `lamps/<name>/`. TM-30 is computed from the measured spectrum
+with [colour-science](https://www.colour-science.org/); the spectrum is
+relative, which TM-30 is invariant to. Sanity check of the implementation:
+`uv run tm30.py` reproduces the published values for the CIE FL2 illuminant
+(Rf 70, Rg 86).
+
 ## Offline Parsing
 
 Parse previously captured USB traffic (pcap files from USBPcap):
@@ -72,6 +104,8 @@ uv run hpcs6500.py --parse captures/some_capture.pcap --quick
 | File             | Description                                        |
 |------------------|----------------------------------------------------|
 | `hpcs6500.py`    | Driver class (`HPCS6500`) and CLI                  |
+| `lamp_export.py` | Lamp comparison bundle export (spd/tm30/metrics)   |
+| `tm30.py`        | ANSI/IES TM-30-18 computation from a spectrum      |
 | `usb_capture.py` | USB traffic capture tool (requires USBPcap)        |
 | `PROTOCOL.md`    | Complete protocol reference (byte-level)           |
 | `pyproject.toml`  | Project metadata and dependencies                 |
@@ -86,6 +120,7 @@ uv run hpcs6500.py --parse captures/some_capture.pcap --quick
 
 - Python 3.11+
 - `pyserial` (serial communication)
+- `colour-science` (TM-30 computation)
 - USBPcap (only for `usb_capture.py`, not needed for normal operation)
 
 ## Protocol