docs(tech-specs): split PR #695 review follow-ups into 6 tasks

[tonyfromundefined]

Summary

• PR #695에서 ENvironmentSet이 남긴 리뷰(본문 4건 + 인라인 1건 + 이슈 코멘트 4건, 총 17개 항목)를 후속 PR 단위 6개(06a/06b/06c/07a/08/09)로 분리해 .tech-specs/tasks/에 추가
• 리뷰어 반대에 따라 @stackflow/compat-await-push 삭제 계획을 철회하고 01-delete-deprecated-packages.md에서 제외 (별도 복구 태스크 08 신설)

Test plan

• .tech-specs/tasks/의 6개 신규 파일이 PR [BREAKING CHANGE] future -> stable #695 리뷰 항목을 모두 커버하는지 확인
• 각 태스크의 선행 PR/파일 경로가 현재 레포 상태와 일치하는지 확인

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