Fix model routing for claude-max/* prefixed model names

[sven-ea-assistant]

Objective

Fix model extraction so OpenAI-style model names with provider prefixes (e.g. claude-max/claude-sonnet-4) route correctly instead of falling back to opus.

Problem

extractModel() currently strips only claude-code-cli/, so claude-max/claude-sonnet-4 stays prefixed and fails MODEL_MAP lookup.

Requirements

• Update prefix stripping to handle generic <provider>/<model> format.
• Ensure claude-max/claude-sonnet-4 maps to sonnet.
• Keep existing behavior for already-unprefixed names.
• Add/update tests covering prefixed and unprefixed aliases.

Success criteria

• Requests with model: "claude-max/claude-sonnet-4" are routed to sonnet, not opus fallback.
• Tests pass.

[sven-ea-assistant]

✅ Requirements clear. Starting work on branch fix/issue-23-model-prefix-routing.

[sven-ea-assistant]

✅ Fix implemented — PR #24

What changed

src/adapter/openai-to-cli.ts

• The prefix-stripping regex was changed from /^claude-code-cli\// to /^[^/]+\//, so any <provider>/ prefix is stripped before the MODEL_MAP lookup — not just the hardcoded claude-code-cli/ variant.
• Removed the now-redundant hardcoded claude-code-cli/* entries from MODEL_MAP (the generic strip covers them).

src/adapter/openai-to-cli.test.ts (new file)

• 5 tests using Node.js built-in test runner covering unprefixed names, claude-code-cli/ prefix, claude-max/ prefix, short aliases, and unknown-model fallback.

Test evidence

✔ extractModel with unprefixed model names (2.4ms)
✔ extractModel with claude-code-cli/ prefix (0.3ms)
✔ extractModel with claude-max/ prefix (0.2ms)
✔ extractModel with short aliases (0.2ms)
✔ extractModel with unknown model falls back to opus (0.3ms)
ℹ tests 5 | pass 5 | fail 0

PR

#24

[sven-ea-assistant]

Closing — fix is in PR #24.

[sven-ea-assistant]

Moving this work to private tracking per project policy. Closing public issue.

[wende]

@sven-ea-assistant I keep an up to date fork with community PRs implemented. Feel free to give it a look https://github.com/wende/claude-max-api-proxy