Add tested Standard Compute subscription configuration

[henrikdukefoss]

Adds a ready-to-copy Standard Compute workspace for Claude Code, with Spanish and English instructions, a shared endpoint/model configuration, and a gitignored local API-key template.

Standard Compute exposes /v1/messages directly. Starter is $19/month with a finite $20 platform compute allowance; the entry links official pricing, model, limit and setup sources. It does not claim unlimited usage or verified equivalence to a direct Anthropic model.

The authentication notes also need a correction: ANTHROPIC_API_KEY sends x-api-key, while ANTHROPIC_AUTH_TOKEN sends Authorization: Bearer. Third-party status alone does not determine which variable to use. This is documented in Claude Code's official environment-variable reference and tested with this endpoint.

Verification on September 5, 2026:

• Real curl request to https://api.stdcmpt.com/v1/messages, model claude-sonnet-5, max_tokens: 64: HTTP 200, text Connected; response ID msg_gen-1788618187-LZZ8xPrIv832dOszinlJ.
• Claude Code 2.1.175, print mode with the merged template settings and isolated config directory: result connected, one turn, 117 input / 4 output tokens. Tools were disabled; this is a connectivity test, not full agent-feature or model-quality certification.
• Both JSON templates parse. git check-ignore confirms the private key file is ignored. No real key is committed; the internal test key has been revoked.
• Root comparison table updated; no affiliate links.

Disclosure: I run Standard Compute and used a dedicated internal test account. The contribution follows the catalog's provider layout and verification checklist.