chore: remove BareBuild from BareDOM

[avanelsas]

Retire BareBuild entirely from the BareDOM repo, landing the removal as a single clean deletion PR (no history rewrite / force-push — honors the PR-only release norm).

What's removed

• Read-side orchestration elements: barebuild-router, barebuild-route, barebuild-data (components, exports, tests, docs, demos).
• BareBuild CLI + project template and the Phase-4 demo app (whole barebuild/ dir).
• All BareBuild docs.
• Alpha (pre-release) dist-tag CI lane — reverts ci(release): add an alpha (pre-release) dist-tag lane #261 (release.yml + docs/RELEASING.md).
• The now-obsolete scripts/check-barebuild-boundary.bb and its CI step + the demo-app E2E job.

Merged PRs being retired

#252, #253, #256, #258, #259, #260, #261.

Deliberately preserved

• fix: form controls collected by name (x-form + x-select/x-date-picker) #257 — unrelated x-form/x-select control-collection fix that happened to land between BareBuild V1 CLI: barebuild new generator + project template #253 and feat(barebuild): Phase 4 read-only demo app + write-side telemetry #256.
• fix(x-select): make .value reflect the current selection #263 — x-select .value fix.

The open write-side PR #262 (and its branch feat/barebuild-write-side) is being closed/deleted separately.

Why this is safe

The BareBuild seam was CI-enforced (no non-BareBuild component imported any BareBuild code), so this is deletion + clearly-delimited reference-block edits — no cascading changes into shared utilities.

Reference-block edits

• registry.cljs / core.cljs — drop barebuild-registers
• shadow-cljs.edn / package.json — drop the barebuild-* ESM modules + exports
• public/index.html / README.md / docs/components.md — drop the now-empty Orchestration category
• scripts/generate_types.bb / metadata.bb — type only x-* again
• .github/workflows/ci.yml — drop the boundary check + demo-app E2E job
• custom-elements.json — regenerated (no barebuild entries)
• CLAUDE.md / src/baredom/utils/dom.cljs — scrub barebuild from inline examples

Verification

• clj-kondo --lint src test → 0/0
• shadow-cljs release lib → 0 warnings (Closure Advanced)
• shadow-cljs compile test → 0 warnings
• npm test → 5096 passing
• require-style / du-discipline / method-api / bundle-size guards → all green
• grep gate → no barebuild references remain in tracked files

Follow-up (not in this PR)

The published @vanelsas/baredom@4.0.0-alpha.1 (npm alpha tag) will be deprecated separately via npm deprecate — git cannot retract a published package.

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