Carry the copyright and license header in the remaining file templates and in the PyPI wheel's generated modules #1591

#1563 gave every tracked source file the header, made the three Go generators and the create-mcp-tool skill's templates write it, and gated the tree with make check-file-headers. Two places that create source outside the tree it judges were left out.

Templates that still show a new file without the header

Each of these tells the reader to create a Go file and shows it opening directly with its package clause:

• .github/skills/go-safe-move-refactor/SKILL.md: the minimal doc.go of step 3 (block at line 77) and ${dstDir}/action_specs.go of step 7 (block at line 165).
• .github/skills/modularize-go-package/SKILL.md: ${sourcePackage}/{domain}/action_specs.go of step 3c (block at line 136).
• docs/development/development.md, "Example: Adding a tools sub-package": internal/tools/branches/branches.go (line 438) and action_specs.go (line 464).

Each should open with the two header lines and a blank line, as the create-mcp-tool templates and docs/development/file-headers.md do. In the doc.go template the blank line matters, so the header is not read as the package comment.

The PyPI wheel's Python modules

scripts/build_pypi.py writes LAUNCHER (line 94) and MAIN_MODULE (line 143) into the published wheel as gitlab_mcp_server/__init__.py and gitlab_mcp_server/__main__.py, and neither carries the header. The "Generated files" section of docs/development/file-headers.md says the other generators write only documentation and data, which is not true of this one.

Done when

• The four templates open with the header and a blank line.
• Both wheel modules open with the header. Item 13 of Move the repository's Python, Node and shell tooling into Go commands under cmd/ #1114 ports build_pypi.py to a Go command, so the port writes it if it lands first; otherwise the Python script does.
• docs/development/file-headers.md names the wheel modules among the generated source.
• make check-file-headers, the Python script tests and markdownlint pass.