docs: clarify spec skill bootstrap commands

[captainsafia]

Description

Clarifies the spec PR guidance in CONTRIBUTING.md so contributors know:

• /write-product-spec and /write-tech-spec are sourced from warpdotdev/common-skills, not authored directly in warpdotdev/warp
• skills-lock.json pins the expected common-skill versions for this checkout
• ./script/bootstrap can restore the pinned common skills, with project-local and global install options

I confirmed the documented commands against script/bootstrap, script/windows/bootstrap.ps1, script/resolve_common_skills, skills-lock.json, WARP.md, and the relevant common-skills installation history.

Linked Issue

N/A — requested from Slack.

• 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).

Testing

• git --no-pager diff --check

• I have manually tested my changes locally with ./script/run

Screenshots / Videos

N/A — documentation-only change.

Agent Mode

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

CHANGELOG-NONE

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

Conversation: https://staging.warp.dev/conversation/a6331e13-9a95-4e90-ae7b-94a1f48b4b08
Run: https://oz.staging.warp.dev/runs/019e7f63-cc19-77de-a6af-db85694b4888
This PR was generated with Oz.

[oz-for-oss]

@captainsafia

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[oz-for-oss]

Overview

This documentation-only PR clarifies where the spec-writing skills come from, how skills-lock.json pins the expected common skills, and which ./script/bootstrap commands restore them. I checked the changed guidance against the local bootstrap scripts and lockfile context.

Concerns

• No blocking concerns found.

Verdict

Found: 0 critical, 0 important, 0 suggestions

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[captainsafia]

@vkodithala Mind giving this one a quick stamp? We need to update our contributing docs now that we've moved things to common-skills.

[vkodithala]

(Disregard this comment I was being an idiot)

[vkodithala]

🚀 THANK YOU