docs: add missing vane Gifts sections and undocumented tasks

[sigilante]

Thirteenth PR from the audit against urbit/urbit@08026c84b2. Four vanes documented their tasks but never their gifts — the cards existed only as passing mentions under whichever task produced them, if at all.

Companion PRs: #266, #267, #269, #270, #271, #272, #273, #274, #275, #276, #277.

Gifts sections added

Vane	Cards	Source
behn	4 — %doze %wake %meta %heck	lull.hoon:2404
dill	8 — %blit %logo %meld %pack %trim %logs %meme %quac	:2861
eyre	6 — %boon/%done %set-config %sessions %response %bound %grow	:2978
iris	3 — %request %cancel-request %http-response	:4131

Coverage verified by script: every gift in each source union now appears in its doc.

Two naming collisions are called out explicitly, since both are easy to misread:

• Iris has %request and %cancel-request as both a task and a gift. The task is how a vane asks Iris to fetch something; the gift is how Iris asks Unix to do it.
• Dill has %meld, %pack, %trim and %quac in both unions, pointing in opposite directions.

Tasks added

Vane	Task	Note
dill	%mass	run a memory report — the mechanism behind |mass
dill	%quac	the runtime's reply carrying that report
dill	%knob	documented as deprecated
eyre	%eauth-host	set the EAuth base URL
eyre	%spew	set verbosity toggle
khan	%done	external control socket closed

%knob is marked :: deprecated removeme in lull.hoon. The entry exists to stop anyone adopting it, not to encourage use — an undocumented deprecated card is worse than a documented one, since nothing signals that it's on its way out.

%eauth-host is a nice illustration of the gap: the EAuth guide already described this task in detail, while tasks.md — the page that purports to enumerate Eyre's interface — never listed it. Now cross-referenced.

Checked and deliberately not changed

• khan already had a complete Gifts section (%arow, %avow).
• eyre's %reject-origin and %set-response did not appear in a first partial extraction of the task union, which briefly looked like the docs had phantom cards. They exist at lull.hoon:3063 and :3069 — the docs were right and my extraction range was too narrow. No phantom cards in any of these files.

All anchors verified to resolve. Test-merged against the twelve open companion PRs — all clean, including confirmation that dill/tasks.md takes #269's %meld payload change and this PR's Gifts section together.

🤖 Generated with Claude Code