feat(scanner): reject plugin gem push and nuget push

[seonghobae]

Successor of #1182 / issue #1099. Does not Close those. pnpm/uv/poetry stay #1182. npm/twine/cargo stay #1180. Pass is not Noema admission.

Unique delta

Fail closed when a plugin hook or manifest runs remaining language-registry writes that #1182 left as inventory:

• gem push as claude-plugin-gem-push-command (CWE-269)
• nuget push and dotnet nuget push as claude-plugin-nuget-push-command (CWE-250)
• gem list and nuget list stay inventory
• unquoted # comments, echo/printf lookalikes, and marketplace description prose are not this class
• README gem wording is not a hook command
• pnpm publish stays claude-plugin-pnpm-publish-command
• snippets are command labels, not tokens or secrets

#1182 remains owner of pnpm/uv/poetry publish.

Evidence

• RED 6d1afd3 then GREEN 798da47
• tests/test_claude_plugin_gem_nuget.py plus sibling alt-publish/registry lock
• plugin coverage suite 495 passed on Python 3.13

Relates to #1099. Relates to #1182.

Current quoted-command context repair

This descendant inherits #1173 RED d7384e53d44a426356a73e24b2b9cc3fe153de27 and final canonical repair 3a5b14771cc7abb6553fa1ec9bcd8b62acc947ac without copying a leaf workaround. Exact head: 53cd89ec3dcc20d8cfd6c7ad355b705c3d2704c2; current parent: e9df55d04e2563ad90a574d4f2f5685fa52754af; Git compare is 0 behind and preserves this PR's unique detector/test delta. The top #1183 source AST and extracted helper probes pass quoted/reporting negatives while preserving direct and command-substitution positives. This custom-base PR stays Draft until its own hosted integration and independent review are terminal.

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: 3e571723a65266c086912b9f3bf1de648150cc01; current parent: 058051f72e7a953905bafcf5142eb93f7698e863; 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 2c7b0656fdd9e1977483fb007e3173d387254893; exact head is 4253ddeb380245db514c885fc6bf26662515211c. GitHub compare reports behind_by=0, ahead_by=11; 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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