Domain names become an allocatable resource with one authority. A new
core module (schema `domains`, own migration stream between core and the
integrations) owns claims — a DNS node plus its whole subtree, mutually
disjoint: operator shared-domain roots, member claims carved from them,
and bring-your-own names proven by TXT verification — and placements,
which bind a name inside a claim to a provider slug and resource ref.
Verification moves to the claim and decouples from creation. A member
proves control of a domain once; afterwards every name inside it places
instantly, wildcard-CNAME friendly, with no further DNS work. The claim
workflow activates the claim and stops — it no longer creates a site —
so the sites list offers a one-click create once a domain verifies.
/domains/ask answers from placements and is registered by core rather
than the FedWiki adapter; its HTTP contract is unchanged. A configured
`domains-ask-fallback-url` forwards names the registry does not know to
a legacy answerer, the strangler seam wiki.cafe's migration needs; a
name the registry knows but has archived is refused locally.
FedWiki's create saga reserves the name before the farm call, carrying a
workflow-minted site id so retries are idempotent, and compensates on
failure. Sync places only names it owns, never stealing a member's;
lifecycle transitions and the retention purge maintain servability. An
unconditional boot pass seeds operator roots, releases orphaned
placements, and adopts pre-existing sites — grandfathering member-owned
external domains shortest-name-first, and skipping name policy, so a
live single-letter site cannot lose its certificate.
Members manage domains at /domains: claims with verification status, DNS
records including an optional wildcard row, check-now, cancel, release.
Name policy (reserved, blocked, premium, plus a single-letter guard) is
operator data; refusals collapse to a plain "unavailable" so the console
never becomes an oracle for who holds what.
BREAKING (pre-release): `fedwiki.custom_domain_verifications` and
`sites.is_custom_domain` are dropped, the flag now derived from the
placement's claim kind; resource key `fedwiki_custom_domains` migrates
to the platform-owned `external_domain_claims`; running
verify-custom-domain workflows must be terminated before deploy.
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