fix(next-plugin): isolate coordinator port file and explain unreachable coordinators

[owjs3901]

Concurrent next dev and next build in one distDir shared coordinator.port, deleting and overwriting each other's port.

• Port file records the owner pid (port stays on line 1, so older readers still work)
• A live foreign owner's file is never removed; this process uses coordinator..port instead
• Missing/unreachable coordinator errors report port, owner pid and state, file path and recovery; the cached port is dropped on connection errors

bun test 138 pass, tsc and lint clean. The Windows file:///home/runner/...plugin.ts failure is not addressed: no such path is built in next-plugin source.

W40 main 반영 (2026-10-06)

• 2026-10-06: main의 a935315c34b45aeda6dc156e29a5c76df51b76bd까지 병합했습니다 (병합 head: 0fdd9970b50ee3ce767f9ef31d65902c203b56cf).
• 충돌 해결: packages/next-plugin/src/loader.ts는 feat(plugins): deterministic class and file numbering #743 참조처럼 연결 오류/포트 캐시 제거를 먼저 처리한 뒤 main 의존성 등록과 정상 콜백을 실행합니다. 전체 WASM 경로와 게시 버전을 유지했고 참조의 포트 테스트 린트 및 누락된 연결 오류 경로만 보완했습니다. 번호 확정/stateWriter는 가져오지 않았습니다.
• 검증: CI37438155520 success; 네 작업과 codecov/patch 모두 통과, MERGEABLE/CLEAN. Ubuntu Rust100%(9812/9812), Bun5489 pass/0 fail 및100%, landing 두 모드130개씩 통과. 직렬 빌드/1.99clippy/전체 훅, 집중 테스트26개와 실제 HTTP 의존성 전달·연결 오류 진단·새 포트 캐시 복구가 통과했습니다. fix(next-plugin): isolate coordinator port file and explain unreachable coordinators #726→feat(plugins): deterministic class and file numbering #743 기본 merge-tree는 exit0(tree c5d6cfa3dc15e21f8c5f8432b955927bddf91f2a)이고 #743은 변경하지 않았습니다. TypeScript LSP 미설치로 진단은 불가했습니다.
• 새로 생기는 오류: 이번 병합으로 추가되는 오류는 없습니다. 기존 PR의 동작 및 남는 한계는 유지합니다.

[github-actions]

Changepacks

@devup-ui/next-plugin@1.0.90 → 1.0.91 - packages/next-plugin/package.json

Patch

• Isolate the coordinator port file per owning process when another live next dev/build holds it, record the owner pid, and report port, pid and recovery when the coordinator is missing or unreachable

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
packages/next-plugin/src/coordinator-port.ts	100.00% <100.00%> (ø)
packages/next-plugin/src/coordinator.ts	100.00% <100.00%> (ø)
packages/next-plugin/src/css-loader.ts	100.00% <100.00%> (ø)
packages/next-plugin/src/loader.ts	100.00% <100.00%> (ø)
packages/next-plugin/src/plugin.ts	100.00% <100.00%> (ø)

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