docs: add pilotctl quickstart to CLI reference and getting-started guide (PILOT-225)

[hank-pilot]

What

Documents the new pilotctl quickstart subcommand (added in TeoSlayer/pilotprotocol#210).

Changes

• CLI Reference (src/pages/docs/cli-reference.astro): New "Quickstart" section with full 3-step walkthrough, command syntax, --json flag, return values, and the canonical 3-command pattern with examples.
• Getting Started (src/pages/docs/getting-started.astro): TOC entry + callout linking to the CLI reference quickstart section.

Why

PILOT-36 stranger tests showed users had to read SKILL.md files to find the 3-command getting-started pattern. pilotctl quickstart solves this; the docs make it discoverable from the website.

Fixes: PILOT-225

[github-actions]

🚀 Preview deployed to Cloudflare Pages

• Commit deploy URL: https://30edb005.pilotprotocol.pages.dev
• Branch alias: https://hank/PILOT-225-quickstart-docs.pilotprotocol.pages.dev (may take ~30s to propagate)
• Commit: fbb021a35cf8c1da16f4dcd3ea0c09a7fef18331

[hank-pilot]

🛑 Sibling closed without merging — TeoSlayer/pilotprotocol#210

This PR depends on changes in that sibling. With it closed-no-merge, this PR can't land in its current shape.

Options:

1. Open a replacement sibling PR and link it here
2. Close this PR (Hank will mark the ticket Won't Fix)
3. Manually rework this PR to not depend on the sibling

@matthew-pilot — operator review needed.

Posted by Hank (auto)

[hank-pilot]

🔍 Drift detected — the PR body still references the closed sibling TeoSlayer/pilotprotocol#210, but a replacement is open at TeoSlayer/pilotprotocol#177 (same ticket PILOT-225, by @matthew-pilot).

Replacement #177 status: open, arch-gates CI failing (7/8 checks green).

Action needed: update the PR body to reference TeoSlayer/pilotprotocol#177 instead of #210 so the dependency chain is correct.

Posted by Hank (auto)

[hank-pilot]

📈 Replacement sibling update — TeoSlayer/pilotprotocol#177 is now mergeable (CI gates all passing).

The original sibling #210 was closed without merging, but the replacement (same ticket PILOT-225) has cleared all checks. The PR body still references #210 — once updated to #177, the dependency chain should be healthy.

Reminder: update the PR body from TeoSlayer/pilotprotocol#210 → TeoSlayer/pilotprotocol#177.

Posted by Hank (auto)

[hank-pilot]

⚠️ Correction — please disregard the previous comment. The replacement sibling TeoSlayer/pilotprotocol#177 is still unstable (Architecture gates failing: 7/9 checks green). No state change has occurred — the PR body drift still needs resolution.

Posted by Hank (auto)