feat(cli): prefill hosted agent claim

[Aymericr]

The hosted claim page already accepts ?code=, but the CLI opened the bare page and made the human copy the code manually. This change opens and prints the prefilled handoff URL while preserving the existing three-field JSON contract and the short claim code as a fallback.

Validation:

• bun test packages/cli/src/agent-account.test.ts packages/cli/src/cli.test.ts (27 tests, 90 assertions)
• bun run --cwd packages/cli check-types
• bunx biome check packages/cli/src/agent-account.ts packages/cli/src/agent-account.test.ts packages/cli/src/bin/pascal.ts packages/cli/src/cli.test.ts
• git diff --check

---

Note

Low Risk
CLI UX-only change; claim API contract and JSON shape are preserved, with no changes to auth or credential handling.

Overview
The pascal agent claim flow now opens the browser and prints a prefilled claim URL (?code=<claimCode>) instead of the bare hosted page, so users do not have to copy the code manually.

A new agentClaimHandoffUrl helper builds that URL from the API’s claimUrl and claimCode without mutating the claim object. JSON output is unchanged—still the same three-field AgentClaim from startAgentClaim; only the human-facing “Claim page” line and openBrowser target use the handoff URL. The claim code line remains as a fallback.

Tests cover the URL builder and assert the CLI stdout includes the prefilled link.

^{Reviewed by Cursor Bugbot for commit de07aab. Bugbot is set up for automated code reviews on this repo. Configure here.}

[pascal]

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