fix(scripts): make fetch-profile-repos.sh executable

[nerdalytics]

Description

./scripts/fetch-profile-repos.sh exits with permission denied. The file has been mode 100644 since d8cc106 added it on 2026-08-19, so the command in the docs has never worked.

Type of Change

• Bug fix (non-breaking change which fixes an issue)

Changes Made

scripts/fetch-profile-repos.sh. It is the only shell script in scripts/ at 100644, and the other five are 100755. It has a #!/usr/bin/env bash shebang, and 27 call sites invoke it as ./scripts/fetch-profile-repos.sh.

The 27 call sites:

• tests/cold_profile_gates.rs (12, of which 8 are skip messages telling the reader to run it)
• example/README.md (3)
• docs/markdown-context.md (3)
• AGENTS.md (2)
• docs/internal/profile.md (2)
• docs/guides/markdown-context-graph.md (2)
• docs/agent-recipes.md, docs/internal/PR-check.md, rgctl-tests/README.md (1 each)

Testing

On main, ./scripts/fetch-profile-repos.sh gives permission denied and test -x fails. On this branch test -x passes and bash -n reports no syntax error. I did not run the fetch itself, because it clones 14 repositories including torvalds/linux and llvm/llvm-project.

• Unit tests added/updated
• Integration tests added/updated
• Tested with cargo test
• Manual testing performed

Test environment:

• OS: macOS 26.6.2 (Darwin 25.6.0)

Checklist

• I have performed a self-review of my code
• Documentation updated (if applicable). The docs already give the intended invocation. This makes that invocation run.
• CONTRIBUTING.md guidelines followed
• All commits are signed and include DCO sign-off

Breaking Changes

None. No workflow under .github/workflows/ runs this script, and the file content is unchanged.

Additional Notes

The alternative is to rewrite the 27 call sites as bash ./scripts/fetch-profile-repos.sh. One mode bit is the smaller change, and it matches the other five scripts.