refactor(atoms)!: 789 — name every route atom *RouteAtom, and only route atoms

[randomdevpete]

Stacked on #100 (task-685-investigate-required-route-typing) — base this PR against that branch, not master.

The rule

The suffix names the return type: an export whose value is a RouteAtom — readable for a
RouteReturn, writable to navigate, usable as another route's parent — ends in RouteAtom;
any other atom ends in Atom alone.

The rule was already half-present, not invented from scratch: it held across every type
(RouteAtom/AsyncRouteAtom carry Route, NavigationGuardAtom correctly doesn't), and for 6
of 11 atom-valued exports plus all 4 correctly-bare non-routes. Five were on the wrong side of the
line, and all five were routes — one-directional drift, not a real second category:

old	new
rootAtom	rootRouteAtom
createRootAtom	createRootRouteAtom
redirectAtom	redirectRouteAtom
queryParamAtom	queryParamRouteAtom
validateAtom	validateRouteAtom
RootOptions	RootRouteOptions
QueryParamOptions	QueryParamRouteOptions

Unchanged: locationAtom, queryAtom, notAtom, navigationGuardAtom (none of these return a
RouteAtom), and every export that already ended in RouteAtom
(routeAtom, staticRouteAtom, paramRouteAtom, numericRouteAtom, transformRouteAtom,
asyncRouteAtom).

Two rejected rules

Both rival rules that could have justified the status quo fail worse than "drift":

• "Consumes a path segment" — queryParamRouteAtom explicitly doesn't ("Doesn't consume any
  path segments, so path matching continues unaffected"), yet it's a route. rootRouteAtom
  consumes zero segments. redirectRouteAtom swallows whatever's left rather than consuming one.
  Three of the five renamed exports break this rule.
• "Constructor vs value" — rootRouteAtom is a plain value (not a function) and still carries
  Route; notAtom is a factory function and correctly doesn't. Contradicts itself on both
  named-export shapes it's supposed to distinguish.

The pairs that read alike were exactly the misleading ones: rootAtom/locationAtom are both
ambient singletons but only one is a route, and queryAtom/queryParamAtom sound like two
flavours of the same thing when only the second takes part in matching.

Converging the other way (dropping Route from every route atom instead) is fatal:
routeAtom → atom collides with jotai's own atom.

No deprecated aliases

Old names are not kept side-by-side with the new ones. Two names per export would leave the
surface less consistent than it started — the opposite of this ticket's goal — and the alias
would need its own removal ticket later. CODING-STYLE.md also bans speculative pre-production
compat hedging; this repo has no stable major yet (major bumps are suppressed, see below), so
there's nothing to be compatible with.

Release shape

Breaking, but ships as 2.7.0, not 3.0.0: .releaserc.json maps breaking: true to a minor
release, and major bumps are deliberately suppressed in this repo. This lands in the same release
train as #98's (675) own BREAKING CHANGE — two breaking renames in one minor release, which is
consistent with how this repo has already chosen to version, not a new precedent.

Known gap — not fixed here

e2e/registry-smoke/ still references resolvedAtom (removed by #98/675) and isn't touched by
this stack either — it installs from the npm registry at latest and its CI job only runs on
manual dispatch, never on PRs, so nothing here regresses it further. It already breaks on the
first release after this stack lands, tracked as ticket 823.

Verification

npm run build (including the docs SSG prerender of all 130 routes), npm test (114 + 42 = 156
tests), npm run typecheck and npm run lint all clean. Confirmed dist/index.d.ts exports only
the five new names and none of the old.

No style-guide exceptions in this diff.

[randomdevpete]

If anything, ending with "atom" is the pattern supported by jotai core for "factory function that returns an atom instance. I think it is therefore more consistent to rename rootRouteAtom (the singleton) to just rootRoute, and createRootRouteAtom (a create prefix being otherwise never seen) renamed to the slightly more palatable rootRouteAtom.

[randomdevpete]

Done in 0694402