Merge commit from fork

* Escape regex metacharacters in attestation SAN matching

Apply regexp.QuoteMeta to user-supplied values interpolated into regex
patterns in expandToGitHubURLRegex and validateSignerWorkflow. Without
escaping, dots in org/repo names act as regex wildcards, allowing
attestation spoofing via lookalike repositories.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Address review: QuoteMeta entire static string at once

Per review feedback, wrap the full formatted string in QuoteMeta
rather than individual variables, to better indicate the whole piece
is escaped and avoid confusion around trailing/leading chars.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Merge commit from fork

* Validate Jupyter Server URLs

* Validate Jupyter Server URLs: address reviews

* Validate Jupyter Server URLs: address test reviews

* Validate Jupyter Server URLs: address test reviews

feat(skills): list available skills when install runs non-interactive…

…ly (#13548)

Co-authored-by: sammorrowdrums <sammorrowdrums@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Add gh discussion and Issues 2.0 reference to the `gh` skill, plus a …

…README note (#13631)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Babak K. Shandiz <babakks@github.com>

Merge pull request #13536 from cli/bagtoad/kw-fix-attestation-integra…

…tion-tests

fix CI attestation integration tests after rename

Merge pull request #13281 from maxbeizer/fix/projects-v2-ignorable-error

Add "Resource not accessible" to ProjectsV2IgnorableError

Merge pull request #13254 from cli/wm/enable-telemetry

Enable telemetry without env var

Merge pull request #13188 from cli/sammorrowdrums/skills-replace-git-…

…in-publish-tests

Skills: replace real git in publish tests with CommandStubber

Merge pull request #12859 from cli/kw/experimental-huh-prompter

Add experimental huh-only prompter gated by GH_EXPERIMENTAL_PROMPTER

Merge pull request #12915 from cli/revert-12596-fix/clarify-scope-error

Revert "fix: clarify scope error while creating issues for projects"