docs: complete Clay's task coverage and add a Gifts section

[sigilante]

Twelfth PR from the audit against urbit/urbit@08026c84b2. +$ task:clay (lull.hoon:2442-2481) has 30 cards; clay/tasks.md documented 16. Coverage is now 30/30, verified by script.

Companion PRs: #266, #267, #269, #270, #271, #272, #273, #274, #275, #276.

Ten tasks added, in the existing topic sections

Section	Card	Shape
Write and Modify	%into	[%into des=desk all=? fis=mode] — external edit, for Unix sync
	%park	[%park des=desk yok=yoki ran=rang] — synchronous commit
	%pork	[%pork ~] — resume interrupted commit
	%prep	[%prep lat=(map lobe page)] — prime the object store
Apps and updates	%esse	[%esse des=desk ese=?] — mark desk essential
	%zeal	[%zeal lit=(list [=desk =zest])] — batch form of %zest
	%stir	[%stir arg=*] — debug; not stable interface
Merge Desks	%fuse	[%fuse des=desk bas=beak con=(list [beak germ])]
	%drop	[%drop des=desk] — cancel pending merge
Foreign Ships	%werp	[%werp who=ship wer=ship rif=riff-any]

%fuse is the one most likely to be reached from userspace — it backs the |fuse generator — so its entry carries the real usage examples and the %track semantics from the generator's own help text (gen/hood/clay/fuse/help.txt) rather than a reconstruction.

I also called out the %warp / %werp distinction explicitly in the Foreign Ships intro. They differ by one letter: %warp is how we request a file from a named ship; %werp is the inbound form carrying the requesting ship, passed to Clay by Ames. Easy to reach for the wrong one.

Vane lifecycle tasks

Added a short section for the four $vane-task cards (%init, %trim, %vega, %plea). These are shared boilerplate rather than Clay-specific — but they are part of Clay's union, and omitting them is why the file previously looked complete while missing a third of its cards.

There's no shared vane-task page to link to instead; Gall's API page documents its own inline, so this follows that precedent.

Gifts section

All 13 cards of $gift:clay. Previously the gifts appeared only incidentally under whichever task produced them, and %croz, %cruz and %wris were never named at all. The quoted union was checked line-by-line against lull.hoon:2427-2441 by script.

Verification

• Task coverage checked programmatically: 30 in source, 30 covered, none missing.
• Gift union block diffed against lull.hoon — exact match.
• All anchors resolve.
• Test-merged against the eleven open companion PRs — all clean. Confirmed this coexists with docs: remove Clay's deleted Ford cache and correct the Arvo state #270, which removes the Ford cache from clay/data-types.md: the merged tree has zero fad=flow and three %fuse references.

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