(v1) Consolidate Vite/Bun plugin plumbing into @arkenv/build

[yamcodes]

Summary

Consolidate the Vite/Bun plugins' build-time plumbing into @arkenv/build (ADR 0009), which Next/Nuxt already consume but the plugins currently duplicate.

Scope

• Move/reuse in @arkenv/build: env-module identification conventions, layout resolution (resolveLayout), key extraction (extractClientKeys / extractServerKeys / extractSharedKeys), schema watching (watchSchema), and the shared transform helpers introduced by (v1) feat(vite-plugin): env-module transform — canonical env object surface #1328 / (v1) feat(bun-plugin): env-module transform — canonical env object surface #1329 (literal inlining, validator stripping, guard emission) — kept framework-parameterized.
• Deduplicate the current twin helpers between the two plugins (validate → filter → inject logic, FilterByPrefix usage).
• clientPrefix handling becomes shared, first-class config (ADR 0014 consequence).

Constraints

• @arkenv/build stays a published, internal-only package (no private workspace deps — ADR 0009).
• Core arkenv / @arkenv/core remains zero-dependency and edge-compatible; no Node-specific code leaks into runtime packages.
• Generators stay framework-parameterized — no Next-specific assumptions baked into shared code.

Acceptance criteria

• Vite and Bun plugins depend on @arkenv/build for layout resolution, key extraction, and watching.
• No duplicated validate/filter/inject logic remains between the two plugins.
• Next/Nuxt continue passing their existing test suites against the extended @arkenv/build.

Landing

v1 branch only — see ADR 0015 landing strategy. Coordinates with #1328 / #1329 / #1330. Part of #1105 (ADR: #1326).

[pullfrog]

This run croaked 😵

The workflow encountered an error before any progress could be reported. Please check the link below for details.

  ^{｜ Rerun failed job ➔ ｜ View workflow run ｜ via Pullfrog ｜ 𝕏}