M3 — All providers + auth

New Issue

Goal

Round out provider support (OpenAI, Copilot) alongside Anthropic, with auth, cost tracking,
and retry/doom-loop hardening.

Scope

OpenAI chat + responses codecs, provider, registry wiring
auth.json credential storage
Copilot: device-flow login modal, token exchange with direct-Bearer fallback,
/models routing across the three codecs
Model pricing + per-step cost accumulation
models.dev metadata catalog + cost display wiring in the TUI
Retry policy + doom-loop guard (landed in M1's engine loop, exercised fully once all
three providers exist)

Acceptance criteria

The same session works on all three providers.
Device-flow login completes inside the TUI.
Costs shown.

Top risk carried into this milestone

Copilot token exchange variance — opencode ships direct-Bearer, but classic Copilot API wants
the copilot_internal/v2/token exchange. Mitigated with a dual-path token.rs; verify against
the live API early.

No due date

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