docs: finalize P0-P2 release-orchestration plans

Applied the automated review punch-lists (finalize pass): P0 fixes the invalid
gh api --jq, the $GITHUB_ENV bottleneck plumbing, semver-ordered readiness-issue
auto-close, and the changelog-gate verification; P1 wires the PYTHINKER_MANAGED
hook end-to-end; P2 fixes the Scoop extract_dir/bin nesting and the Docker
ancestor-check dry-run. Removed draft banners and embedded punch-lists.

Author: elkaix