Propose: Add PR timing guidance to version control standard

[virtualian]

Proposal

Add a "Pull Request Timing" section to the version control standard specifying when PRs should be created.

Problem

The current standard has:

• "Before Creating PR" checklist
• "PR Checklist"
• "Before Merging" checklist

But no guidance on when to create the PR in the development workflow.

Proposed Addition

## Pull Request Timing

**Create a draft PR immediately after the first push of a feature branch.**

**Rationale:**
- Enables CI checks from first commit
- Provides visibility into work in progress
- Allows automated workflows to comment (e.g., preview URLs)
- PR description written while context is fresh

Convert to ready-for-review when work is complete.

Context

Discovered while implementing GitHub Actions deployment workflows. The preview deployment workflow comments preview URLs on PRs, but this only works if a PR exists. Creating draft PRs early solves this and provides other benefits.

Benefits of Early Draft PRs

1. CI runs immediately - catch issues early
2. Team visibility - others see work in progress
3. Workflow integration - bots can comment (preview URLs, coverage reports, etc.)
4. Better PR descriptions - written while context is fresh, not rushed at the end