Citation X cockpit profile: full Primus 2000 suite (PFD/MFD/EICAS/AP/RMU)

Add a switchable cockpit-profile selector (Garmin G1000 / Cessna Citation X /
GA steam) and recreate the Citation X Honeywell Primus 2000 avionics line-for-
line from the X-Plane Citation X + FMS manuals:

- CitPFD: attitude w/ FD command bars, speed tape (Vmo barber-pole, Vfe, low-
  speed red/amber bands), AOA index, altitude tape + trend, VSI, round HSI with
  CDI/course pointer + VOR/ADF bearing pointers, radar altimeter, minimums,
  STD/BARO/CRS/HDG bezel.
- CitEICAS: twin FAN%/ITT bar gauges, OIL °C/PSI, FUEL (flow/qty PPH·LBS),
  ELECTRICAL, HYDRAULICS, slat chevron, STAB trim, FLAPS, CAS message stack,
  softkeys NORM/FUEL-HYD/ELEC/CTRL-POS/ENG + control-position overlay.
- CitMFD: Honeywell heading-up arc map, FMS route (magenta active/white future),
  TCAS, terrain/WX, range arc, ETE/SAT/TAS/GSPD block, clock + ET/FT timer,
  V-SPEEDS reference card, MFD-setup overlays (TRAFFIC/TERRAIN/APTS/VOR).
- CitAP: HDG/NAV/APP/BC · ALT/VNAV/BANK/STBY · FLC/C-O/VS · pitch wheel ·
  AP/YD/M-TRIM/PFD-SEL, FMA bar + lamps from per-mode *_status datarefs.
- CitRMU: COM/NAV active+standby tuning, transponder, ADF, TCAS range/mode,
  IDENT + Nav Source Selector (NAV1/2/FMS, VOR/ADF/FMS bearing source).

Integration: all avionics stream live via the X-Plane Web API (new datarefs for
N1/N2/ITT, radar-alt, AOA, hydraulics, trim, flaps/slats/gear, control
positions, ADF, mach, yaw-damper); the existing fms-sync.lua drives the
Citation's built-in FMS (aircraft-agnostic XPLM FMS SDK). Demo seeds added so
every panel renders offline. Verified headless via Playwright (no console
errors; G1000/GA profiles unaffected).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

plugins/README.md

@@ -36,3 +36,26 @@ desktop app sets it to the bundled scripts; otherwise it finds `plugins/` itself
 A 3-decimal lat/lon signature de-dupes the round-trip, so the two sides never
 loop. Waypoints are pushed as lat/lon legs (exact route; in-sim idents are
 generic — route accuracy over cosmetics).
+
+## Cessna Citation X (Honeywell Primus 2000)
+
+The app ships three switchable **cockpit profiles** (sidebar dropdown): the
+Garmin **G1000**, the **Citation X**, and a **GA steam** panel. The Citation
+profile recreates the Primus 2000 suite line-for-line from the X-Plane Citation
+X manual — **PFD** (attitude, speed/alt tapes with Vmo barber-pole + Vfe + AOA,
+HSI with VOR/ADF bearing pointers, CDI, VSI, FD bars, radar altimeter,
+minimums), **MFD** (Honeywell arc map, FMS route, TCAS, terrain/WX, ETE/SAT/TAS/
+GSPD, ET/FT timer, V-SPEEDS card), **EICAS** (twin N1/ITT/oil, fuel, electrical,
+hydraulics, slats, stab-trim, flaps, CAS), the **autopilot/flight-guidance**
+controller (HDG/NAV/APP/BC · ALT/VNAV/BANK/STBY · FLC/VS · AP/YD/M-TRIM/PFD-SEL
++ pitch wheel), the **Radio Management Unit**, and the **Nav Source Selector**.
+
+Integration:
+- **Avionics (PFD/MFD/EICAS/AP/RMU):** every value is a universal X-Plane
+  dataref / command streamed live by the bridge over the **Web API** — no Lua
+  needed (N1/N2/ITT, radar-alt, AOA, hydraulics, trim, flaps/slats/gear, control
+  positions, ADF, mach, yaw-damper, the per-mode `*_status` AFCS annunciation…).
+- **FMS / CDU:** the same **`fms-sync.lua`** bridges the web CDU ↔ the in-sim
+  FMS. It uses the aircraft-agnostic XPLM FMS SDK, so it drives the Citation X's
+  built-in FMS exactly as it does the G1000's — load/build a plan on a tablet and
+  the Citation flies it; build it in the sim and it shows on every tablet.