[oddessentials]

Closes #378.

Anyone can now replace a Yard's surroundings with a world they built in Agent Guild: Builders, or one someone shared with them.

Create your own Yard

• Every Yard has a small spot at the bottom-left: Replace this Yard and Build a world, or Restore original and Replace once a world is in use.
• Replace opens the existing folder dialog, filtered to .agworld files on the computer running Agent Guild. Build a world opens the Builders release page and shows only on Windows managers.
• A world can replace any Yard. The Yard keeps its own halls and crew, and shows the world's title. There is one world per Yard, and Restore original deletes it.
• World files are treated as untrusted. Names, sizes, hashes, image headers and the layout hash are checked before anything is served, and only plates and skies are served, under the existing security headers.
• A world that cannot be used leaves the Yard showing its original and says why. An interrupted install or a locked file leaves the reported state true, and a leftover folder cannot stop the manager from starting.
• New routes are in docs/api.md: /yard-worlds, /yard-worlds/:skin, and files=agworld on /folders.

Buttons

• Grove's install button is rebuilt as live text. Guild gets a Play now button for Arena, and Professional an Install now button for Builders, with a BETA stamp where it fits.
• The Terminal AI Chat card shows the five Yard buttons at their smallest under "Need a break?". On touch, a first tap names the button and a second opens it. Orbital's stays a split button with AI Revolt and Towers.

Maintenance

• Removes Dependabot.
• Updates ws to 8.22.1, markdown-it to 15.0.3 (fixes GHSA-vfgh-jcmw-g37q and GHSA-gfr2-rv44-r23c) and three to r187, and applies audit fixes to the release tooling lockfile.
• The macOS WebKit job runs only the WebKit pass of the dialog check, because the Linux job already runs the Chrome pass.

Checks

On Windows, at a45bdef:

• npm test: 1203 passed, 0 failed, 75 skipped.
• Browser tests: all 12 pass, including layout and yard.

Also run locally:

• layout under CI's Ubuntu fonts, without Yard art.
• A real Builders export on all six Yards, by day and at dusk, on software rendering, before the later fixes. Replace and Restore were rerun against a real manager after the state fixes.
• World install from an npm pack copy, through the API only.

Not run locally, so this PR's CI is their first run: the macOS and Node version matrix, systemd, Alpine musl, release plan, native builds and check-tarball.

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