feat(scanner): reject plugin dart and flutter pub publish

[seonghobae]

Successor of #1183 / issue #1099. Does not Close those. gem/nuget stay #1183. pnpm/uv/poetry stay #1182. Pass is not Noema admission.

Unique delta

Fail closed when a plugin hook or manifest runs remaining Dart registry writes that #1183 left as inventory:

• dart pub publish, flutter pub publish, and legacy pub publish as claude-plugin-pub-publish-command (CWE-269)
• dart pub get and flutter pub get stay inventory
• pnpm publish stays claude-plugin-pnpm-publish-command
• unquoted # comments, echo/printf lookalikes, and marketplace description prose are not this class
• README pub wording is not a hook command
• snippets are command labels, not tokens or secrets
• composer publish and go upload are not invented; they are not real package-manager CLIs

#1183 remains owner of gem/nuget push.

Evidence

• RED 4351d47 then GREEN 09b6dce
• tests/test_claude_plugin_pub_publish.py plus sibling gem/alt-publish lock
• plugin coverage suite 506 passed on Python 3.13

Relates to #1099. Relates to #1183.

Current assignment-value context repair — 2026-09-08

This normal two-parent descendant inherits canonical #1173 RED 90ae232e852b3d01463d978f9bccd9157c341fe7 and GREEN 1e6a3eb43a5bc2d146656af13e7fa6cad2a77315 without a leaf workaround. Exact head: 3b5f6416c5cba8f6ce16c53c0e6b74575448e059; current parent: 3e571723a65266c086912b9f3bf1de648150cc01; Git compare is 0 behind and preserves this PR's unique detector/test delta. Assignment-value negatives and environment-prefix/direct/substitution positives are present in the exact tree. This custom-base PR remains Draft until its own hosted integration and independent current-head review are terminal. Earlier head strings in this body are historical evidence only.

Current heredoc-safe restack — 2026-09-08

Canonical #1173 exact head 184b4b4f55906284ac1d8059e46cec8f0d9cfc9a fixes closed literal here-document payload false positives with RED 6f6be77d... → GREEN 12faf2f.... This branch was integrated non-destructively on parent 4253ddeb380245db514c885fc6bf26662515211c; exact head is bde44516021aa6c1fd6c2be7c7beb9345a671d97. GitHub compare reports behind_by=0, ahead_by=9; the PR's unique detector delta remains in the tree. Exact-head hosted integration and independent review are not terminal, so this PR remains Draft. Earlier head strings are historical evidence only.

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