feat: runtime-split-shared-builder shared builder

plugins/ndf-shared/README.md

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+# NDF Shared Source
+
+`plugins/ndf-shared` is the editable source for NDF runtime plugins.
+
+Runtime plugin directories are generated artifacts. Edit shared skills and
+scripts here first, then run:
+
+```bash
+bash scripts/build-runtime-plugins.sh
+```
+
+Check generated files without modifying the working tree:
+
+```bash
+bash scripts/build-runtime-plugins.sh --check
+```
+
+## Layout
+
+- `skills/` - shared Skill implementations.
+- `scripts/` - shared helper scripts copied into runtime plugins.
+- `manifests/claude-skills.txt` - Claude Code published Skill set.
+- `manifests/codex-skills.txt` - Codex published Skill set.
+- `manifests/kiro-skills.txt` - Kiro published Skill set.
+
+Generated runtime files must be committed with shared source changes so users
+can install plugins without running the build script.

plugins/ndf-shared/manifests/claude-skills.txt

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+pr
+pr-tests
+fix
+review
+cross-review
+merged
+clean
+ndf-policies
+markdown-writing
+python-execution
+docker-container-access
+git-gh-operations
+branch-fix-strategy
+implementation-plan
+investigation-rules
+problem-solving
+logging-guidelines
+sync-main
+cherry-pick-pr
+deploy
+review-branch
+review-pr-comments
+resolve-pr-comments
+browser-test
+codex
+statusline
+issue-plan-strategy
+plan-to-spec

plugins/ndf-shared/manifests/codex-skills.txt

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+branch-fix-strategy
+cherry-pick-pr
+clean
+cross-review
+deploy
+docker-container-access
+fix
+git-gh-operations
+implementation-plan
+investigation-rules
+issue-plan-strategy
+logging-guidelines
+markdown-writing
+merged
+ndf-policies
+plan-to-spec
+playwright-execution
+playwright-kit-ops
+playwright-report
+playwright-script-creation
+playwright-test-planning
+pr
+pr-tests
+problem-solving
+python-execution
+resolve-pr-comments
+review
+review-branch
+review-pr-comments
+sync-main

plugins/ndf-shared/manifests/kiro-skills.txt

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+pr
+pr-tests
+fix
+review
+cross-review
+merged
+clean
+ndf-policies
+markdown-writing
+python-execution
+docker-container-access
+git-gh-operations
+branch-fix-strategy
+implementation-plan
+investigation-rules
+problem-solving
+logging-guidelines
+sync-main
+cherry-pick-pr
+deploy
+review-branch
+review-pr-comments
+resolve-pr-comments
+browser-test
+codex
+statusline
+issue-plan-strategy
+plan-to-spec