docs: compare three panel headers against the current one

At nav size the stamp cannot carry itself: its perforation is under a
pixel and its brick field dissolves into the brick bar, leaving a thin
frame around the name. The perforated edge under the bar was also drawn
inverted - round bumps with pointed gaps, where a real perforation is
round holes with flat teeth.

header/ puts the current header beside three replacements on a real
page: A, the wordmark alone with round holes of page colour bitten into
the bar at the mark's own hole-to-tooth ratio; B, the wordmark on a plain
bar; C, a stamp-paper header with an ink hairline, the mark's
perforation, and brick only behind the name. The wordmark files are the
stamp's own outlines, cut out of selfpost-stamp-compact.svg.

A comparison sheet pending the owner's choice; the 33 mockups and the
design contract are unchanged. Also tracks .claude/launch.json, the
local static server the mockups are previewed with.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

docs/assets/panel-redesign/header/wordmark-ink.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="52 39.8 117.4 27.6" role="img" aria-label="SelfPost">
+<!-- The wordmark of selfpost-stamp-compact.svg on its own: the same outlines, no stamp. -->
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