Author the two generic HUD images for the six new chassis

Decisions 1 and 2 settled on one shared damage doll and one shared target-MFD
tile for all six chassis. V4H supplied the two 512x512 dolls (installed in the
previous commit) but neither of these, so both are ours.

Content/textures/HUD/generic.tga (128x128 RGBA) is the in-cockpit doll. It is
an exact 4:1 downscale of hsh/hud/generic.bmp, alpha carrying the zone mask and
RGB flat shading with a one-pixel dark edge. The doll is exactly 4x this size,
so keeping its layout means the cockpit texuv/offset rows are the doll
rectangles divided by four -- no new coordinate authoring in the registration
phase. Header is byte-for-byte the shipped shape: type 2, 32bpp, 65580 bytes.

hsh/MFD/generic.bmp (120x120, 8bpp) is the target-MFD tile: a whole-mech front
silhouette composed from the doll's own eight zone blobs (two legs, two arms,
two side torsos, centre torso, head) rather than drawn from scratch, so it
stays consistent with the damage doll used for the same chassis. Structure
matches hsh/MFD/annihilator.bmp (8bpp, 1078-byte data offset).

Also adds the [hud\generic] page to textures.hint, held back from the previous
commit until the texture existed so a repack could not reference a missing
source. textures.hint is now 4747 pages, 46 of them new, still pure ASCII with
consistent CRLF.

Note the cockpit texture is deliberately flat-shaded rather than a rendered
mech; it reads correctly and is zone-accurate, but it is placeholder-grade next
to the hand-painted per-chassis art and can be replaced without touching any
coordinates.

Co-authored-by: Claude Opus 5 (Anthropic) <noreply@anthropic.com>
Co-authored-by: GitHub Copilot <copilot@github.com>

Gameleap/mw4/Content/textures/textures.hint

@@ -61590,3 +61590,18 @@ pageout=default
 readonly=true
 resourcify=true
 bias=0
+
+[hud\generic]
+format=alpha
+mipmap=none
+readonly=true
+memory=video
+dontshrink=true
+nogamma=false
+blueisalpha=false
+pinkisalpha=false
+mipfilter=box
+reloadfromdisk=false
+pageout=default
+resourcify=true
+bias=0