fix(sessions): give Claude login a reusable starter profile

[defangdevs]

After Claude sign-in, the auto-started remote-control session had no profile. The default profile seed runs at supervisor startup, so signing in did not ensure that Add session offered the same worker.

Successful Claude login now ensures a claude profile exists and resolves the auto-started session through it. New profiles contain only HARNESS=claude, leaving model and effort at their defaults. Existing settings are preserved; a name already used for another harness gets a numbered alternative. Repeat sign-ins ensure the profile remains available without adding duplicate sessions or changing existing workers. Profile-storage failures retain the previous bare-worker fallback.

This change covers Claude only. Related Codex work remains in #625 / #623. No changes to authentication, permissions, or deployment configuration.

Validation:

• Full native set: nix build -L --keep-going .#ci-native on aarch64-linux.
• Profile tests: 62 passed, including HTTP creation of a second remote-control session from the login profile.
• Native renderer: 150 tests, one existing skip.
• Regenerated module and golden fixtures; diff reviewed.
• Assembled daemon smoke-tested with the installed profile CLI in an isolated HOME.
• Connect VM script evaluated and checked with pinned ty and ruff; VM execution runs in x86 CI.
• Code and security review: profile writes use the env-store lock, existing settings are preserved, and launch arguments use the shared resolver.
• GitHub CI: native checks, all four VM lanes, and the final validation gate passed.

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📥 Commits

Reviewing files that changed from the base of the PR and between 045dc6f and f710533.

📒 Files selected for processing (5)

• modules/agent-box.nix
• modules/src/settings-daemon.py
• tests/connect.nix
• tests/golden/web/payloads/agent-box-settings/bin/agent-box-settings
• tests/test-profile-panel.py

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