Add opt-in common skills installer

[zachlloyd]

Description

Adds an opt-in installer for shared agent skills from warpdotdev/common-skills without changing the default bootstrap or run behavior.

This PR:

• Adds .agents/common-skills.lock to pin the common-skills source revision.
• Adds script/install_common_skills, which installs skills into a selected .agents/skills destination and writes a stamp so unchanged versions are skipped.
• Adds opt-in entry points:
  • ./script/bootstrap --install-common-skills
  • ./script/run --install-common-skills
  • .\script\windows\bootstrap.ps1 -InstallCommonSkills
• Adds bootstrap preview/help output and a note before the macOS Xcode warp_sudo step.
• Keeps the checked-in .agents/skills copies in place for a safe rollout.

Linked Issue

• The linked issue is labeled ready-to-spec or ready-to-implement.
• Where appropriate, screenshots or a short video of the implementation are included below (especially for user-visible or UI changes).

Screenshots / Videos

Not applicable; script-only change.

Testing

• bash -n script/install_common_skills
• bash -n script/bootstrap
• bash -n script/run
• PowerShell parse/help check for script/windows/bootstrap.ps1
• ./script/bootstrap --help
• ./script/install_common_skills --help
• git diff --check
• Common-skills installer smoke tests for initial install, up-to-date skip, stale reinstall, and quiet non-interactive no-stamp behavior
• cargo fmt --all --manifest-path Cargo.toml
• cargo clippy --manifest-path Cargo.toml --workspace --all-targets --all-features --tests -- -D warnings

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

Co-Authored-By: Oz oz-agent@warp.dev

[oz-for-oss]

@zachlloyd

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[oz-for-oss]

Overview

This PR moves shared agent skills out of the Warp repo and adds bootstrap/run integration that installs or refreshes them from the pinned common-skills lock.

Concerns

• The local common-skills source path bypasses the documented ref override, so a caller can request one ref and silently install/stamp another.

Verdict

Found: 0 critical, 1 important, 0 suggestions

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