vaillant: restore E7000 system manager (15.e7000) lost in TypeSpec migration

The legacy ebusd-2.1.x tree shipped `en/vaillant/15.e7000.csv` defining
the VRC E7000 system manager — sibling to the VRC 700, paired with the
HMU01 heat-pump indoor unit. During the TypeSpec migration the E7000
was not ported, even though 15.e7c, 15.e7f, 15.e7f_2 were. The CSV is
still present in `archived/`.

This restores it with the subset known to respond on Vaillant E7000
SW=0608 HW=7003 (paired with HMU01 SW=0306 HW=8802, a Saunier Duval
rebadge). Notably restores `HwcStorageTemp` — the DHW cylinder probe
reading, which on this controller is the only place the tank temperature
is exposed (the HMU's `Status01.storage` slot returns the sentinel, and
T.1.44 / TestCylinderTemp returns the placeholder `04 2c 01 ff ff`).

Verified ebusctl read after deployment:
  e7000 HwcStorageTemp = 45 (°C, follows the expected 50→55 sawtooth)
  e7000 HwcFlowTemp    = 0.0

The earlier HMU passive-snoop attempt (`HwcStorageTemp` on the b5 07 09 00
exchange) was a mis-identification — that field reads 30–70 °C on a
minutes-timescale, inconsistent with a 200 L cylinder. Reverted.

Author: cibernox

src/main.tsp

@@ -27,6 +27,7 @@ import "./vaillant/15.430.tsp";
 import "./vaillant/15.470.tsp";
 import "./vaillant/15.700.tsp";
 import "./vaillant/15.720.tsp";
+import "./vaillant/15.e7000.tsp";
 import "./vaillant/15.e7c.tsp";
 import "./vaillant/15.e7f.tsp";
 import "./vaillant/15.f37.tsp";

src/vaillant/15.e7000.tsp

@@ -0,0 +1,75 @@
+import "@ebusd/ebus-typespec";
+import "./_templates.tsp";
+import "./errors_inc.tsp";
+using Ebus;
+using Ebus.Num;
+using Ebus.Dtm;
+using Ebus.Str;
+namespace Vaillant;
+
+// @zz(0x15)
+namespace E7000 {
+  // ,E7000,VRC E7000 system manager (paired with HMU01 heat-pump indoor unit)
+  //
+  // Originally shipped as `archived/en/vaillant/15.e7000.csv` in the legacy
+  // ebusd-2.1.x CSV tree. Not ported during the TypeSpec migration, even
+  // though sibling controllers (15.e7c, 15.e7f) were. Reintroduced here to
+  // restore the DHW cylinder probe readings that were lost in that gap.
+  //
+  // Verified against MF=Vaillant;ID=E7000;SW=0608;HW=7003 paired with an
+  // HMU01 SW=0306 HW=8802 (Saunier Duval rebadge). Only the subset known
+  // to respond on this firmware is exposed below.
+
+  // ##### hot water circuit #####
+
+  /** default *r for HWC parameter block (b5 24 02 00 01 00 + 2 ext bytes) */
+  @base(MF, 0x24, 0x2, 0, 1, 0)
+  model r_hwc {
+    @maxLength(4)
+    ign: IGN;
+  }
+
+  /** DHW temperature setpoint */
+  @inherit(r_hwc)
+  @ext(0x4, 0)
+  model HwcTempDesired {
+    value: tempv;
+  }
+
+  /** DHW cylinder/storage actual temperature (Speicheristtemperatur) */
+  @inherit(r_hwc)
+  @ext(0x5, 0)
+  model HwcStorageTemp {
+    value: tempv;
+  }
+
+  /** DHW flow temperature */
+  @inherit(r_hwc)
+  @ext(0x8, 0)
+  model HwcFlowTemp {
+    value: tempv;
+  }
+
+  // ##### sensor probes #####
+
+  /** default *r for sensor probe block (b5 24 02 00 00 00 + 2 ext bytes) */
+  @base(MF, 0x24, 0x2, 0, 0, 0)
+  model r_sensors {
+    @maxLength(4)
+    ign: IGN;
+  }
+
+  /** DHW storage temperature, top probe (stratified-tank installs only) */
+  @inherit(r_sensors)
+  @ext(0x9d, 0)
+  model HwcStorageTempTop {
+    value: tempv;
+  }
+
+  /** DHW storage temperature, bottom probe (stratified-tank installs only) */
+  @inherit(r_sensors)
+  @ext(0x9e, 0)
+  model HwcStorageTempBottom {
+    value: tempv;
+  }
+}