Fix G2 position/RSSI parsers, document motor and DVB test results

Position parser now matches the actual Angle[0]/Angle[1] format
instead of falling back to fragile raw-float extraction. RSSI parser
uses a proper named-group regex matching the real firmware output
format (Reads:<n> RSSI[avg: <v> cur: <v>]) — the old index-based
approach would fail on the actual 5-field response.

Motor test results: both axes move correctly, direction-dependent
overshoot of 0.01-0.06 degrees confirmed. DVB subsystem explored:
BCM4515 Rev B0, firmware v113.37, full command set documented
including DiSEqC 2.x, transponder scanning, and streaming AGC/SNR.
RSSI noise floor is ~500.

CLAUDE.md

@@ -64,12 +64,12 @@ Five known Winegard dish variants documented by Gabe Emerson (KL1FI) / saveitfor
 - **Carryout DIP switches:** All switches to off (up) may disable search mode, but behavior varies by unit.
 - **Carryout G2 uses `a` not `g`:** Unlike the 2003 Carryout, the G2 uses standard `a <id> <deg>` motor addressing and the `mot` submenu — protocol-compatible with the Trav'ler family.
 - **Carryout G2 is RS-422 full-duplex:** Separate TX/RX pairs at 115200 baud via RJ-12 6P6C, vs. RS-485 half-duplex at 57600 on the Trav'ler variants. Tested with DSD TECH SH-U11 USB-to-RS422 adapter (FTDI FT232R). **Polarity matters** — A/B (or +/-) labeling is not standardized; if you get garbled data at the correct baud rate, swap the +/- wires on the RX pair. TX pair polarity swap causes the dish to not receive commands (silent failure).
-- **Carryout G2 position format differs from Trav'ler:** Position query `a` in `MOT>` submenu returns `Angle[0] = 180.00` / `Angle[1] = 45.00` — not the `AZ = / EL =` format used by HAL 0.0.00 and HAL 2.05. The `CarryoutG2Protocol` parser needs to handle this format.
+- **Carryout G2 position format differs from Trav'ler:** Position query `a` in `MOT>` submenu returns `Angle[0] = 180.00` / `Angle[1] = 45.00` — not the `AZ = / EL =` format used by HAL 0.0.00 and HAL 2.05. Move confirmation returns `Angle = 46.00` (no array index). `CarryoutG2Protocol.get_position()` uses `Angle\[0\]`/`Angle\[1\]` regex. Motor overshoot is direction-dependent: +0.01–0.05° in travel direction, -0.02–0.06° on return (stepper backlash).
 - **Carryout G2 firmware version 02.02.48** confirmed (Copyright 2013 - Winegard Company). Bootloader version 1.01. MCU: Kinetis (NXP ARM Cortex-M). DVB tuner: BCM4515 (Broadcom).
 - **Carryout G2 boot sequence:** Bootloader → SPI init → Motor init (System=12Inch, master=40000 steps, slave=24960 steps, ratio=1.602564) → DVB tuner init (BCM4515) → NVS load → EL home (stall detect, 2s timeout) → AZ home (stall detect, 8s timeout) → `Antenna Facing Front` → `TRK>` prompt (if tracker disabled) or search start.
 - **Carryout G2 cable wrap:** Confirmed from homing output: `wrap_min:-42333  wrap_max:2333` (centidegrees). Total range ~446.66°.
 - **Carryout G2 has `h <id>` homing:** Explicit motor home-to-reference command. Not documented on other variants.
-- **Carryout G2 has DVB/RSSI:** Signal strength measurement via `dvb` submenu (`lnbdc odu` to enable LNA, `rssi <n>` to sample). Used for sky scanning / RF imaging. Atmospheric baseline measured at boot: ~494 (18V) / ~499 (13V) wideband.
+- **Carryout G2 has DVB/RSSI:** BCM4515 tuner (ID 0x4515, Rev B0, firmware v113.37). DVB submenu provides `rssi <n>` (bounded, returns `Reads:<n>  RSSI[avg: <v>  cur: <v>]`), `agc` (streaming RF/IF AGC + SNR + NID), `snr`, `lnbdc odu` (enable LNA 13V), `lnbv` (streaming voltage monitor), `dis` (channel params), `config` (hardware ID), `table` (transponder scan), and DiSEqC 2.x commands (`di2*`, `send`). RSSI noise floor is ~500. `lnbdc odu` sets 13V (V-pol); boot default is 18V (H-pol). Streaming commands run until interrupted by `q` or another command.
 
 ## Hardware Specs (SK-1000)
 
@@ -209,9 +209,23 @@ nvs            — enter non-volatile storage submenu
   e <idx>      — read NVS value
   e <idx> <v>  — write NVS value
   s            — save changes
-dvb            — signal info / LNB signal strength submenu
-  lnbdc odu    — enable LNA in ODU mode (powers LNB for reception)
-  rssi <n>     — read RSSI signal strength averaged over n samples
+dvb            — DVB tuner submenu (BCM4515)
+  config       — hardware/firmware version
+  dis          — display channel parameters (frequency, symbol rate, LNB polarity, etc.)
+  lnbdc odu    — enable LNA in ODU mode (13V = V-pol; boot default 18V = H-pol)
+  lnbv         — stream LNB voltage readings (continuous, interrupt with q)
+  rssi <n>     — RSSI averaged over n samples (bounded, returns avg + cur)
+  snr          — SNR level
+  agc          — stream RF/IF AGC + SNR + NID (continuous, interrupt with q)
+  ls           — lock status
+  qls          — quick lock status
+  t <n>        — select transponder
+  table        — generate transponder table
+  e <n> <v>    — edit channel parameter
+  freqs        — tuner frequency list
+  di2id        — DiSEqC read LNB hardware ID
+  di2stat      — DiSEqC read LNB status flags
+  send <hex>   — raw DiSEqC packet (max 6 bytes, space-delimited hex)
 reboot         — reboot firmware
 stow           — fold dish flat (caution: modified feeds may not survive)
 ```