Add _skip_if_repo_missing guard to skill tests that reference sibling
repos (infra, grm, sso-bridge). In CI, only devx is checked out, so
these tests skip instead of failing with FileNotFoundError.
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Add validate_spec, check_pr_size, fast_molecule, nightly_gate, and
create_dependency_pr CI modules. Remove the monolithic pr_review module
and its tests. Replace pr_review CI steps with validate_spec + check_pr_size
+ curl-based APPROVE. Add spec-driven-development and pr-review skills.
Remove dead get_reviewer_token. Update translations and AGENTS.md.
Closes DEVX-155
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