feat: offer the save-this-scan link on anonymous scans (0.6.0)

[mlava]

Why

POST /api/scan returns a claim-bearing saveUrl to keyless callers (main repo PR #206), but the CLI dropped it. So agent-ready scan delivered a real result and then a dead end — no way for the user to keep it.

What changed

formatScan takes an optional saveUrl. When present the scan is anonymous and claimable, so saving it becomes the footer CTA:

  3 check(s) need attention.

  Save this scan to a free account — keeps it in your dashboard:
  https://agent-ready.dev/scan/abc123?claim=…&utm_source=cli_cta&utm_medium=terminal

Anonymous tier: 3 scans per 30 days. Pro adds 50 scans/month, 250-page depth, scan history and weekly monitoring.

One CTA, one link:

• the save link replaces the pricing nudge rather than stacking with it
• the quota note loses its competing /pricing URL but keeps the Pro facts
• the bare report URL is suppressed — it's the same page minus the claim, so following it silently loses ownership

Keyed (Pro) scans are untouched: they already belong to an account, so the weekly-monitoring nudge stays.

Copy

Promises only what free actually grants. Score history and monitoring are both Pro-gated server-side (the API 403s a free user; the dashboard hides both panels), so offering them as reasons to sign up would break the promise at signup. A test asserts this.

Version drift fix

--version printed 0.5.1 while npm had 0.5.2 — nothing tied src/cli.ts VERSION to package.json. Both are now 0.6.0, with a sync guard mirroring the one agent-ready-mcp already has.

Verification

77 tests pass, typecheck clean, builds. Covers: link rendered, pricing nudge replaced, exactly one of our URLs, free-tier copy honest, and graceful fallback when the server issues no link (no CLAIM_SECRET).

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