chore(provider-anthropic): bump iii-sdk to 0.20.0

[guibeira]

Bump iii-sdk to 0.20.0 per https://iii.dev/docs/upgrading/from-0-19-x.md. Rebased on main after llm-router@0.20 merge (#334) — path dep requires it. Build, fmt, clippy, tests green (72 unit + 11 integration); function surface (3 fns provider::anthropic::*) unchanged. No import aliases.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ddafdc2b-951c-4c0a-a1ac-0e593b666ccd

📥 Commits

Reviewing files that changed from the base of the PR and between e9de0a7 and ee269e4.

⛔ Files ignored due to path filters (1)

• provider-anthropic/Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (9)

• provider-anthropic/Cargo.toml
• provider-anthropic/src/discovery.rs
• provider-anthropic/src/errors.rs
• provider-anthropic/src/main.rs
• provider-anthropic/src/register.rs
• provider-anthropic/src/router_client.rs
• provider-anthropic/src/state.rs
• provider-anthropic/src/stream_fn.rs
• provider-anthropic/tests/integration.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/sdk-0.20-provider-anthropic

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[github-actions]

skill-check — worker

0 verified, 27 skipped (no docs/).

Layer	Result
structure	✓
vale	✓
ai	✓
render	✓

Four for four. Nicely done.