feat(api): enforce OpenAI-shaped metadata on Completions and chat

[seonghobae]

Summary

• OpenAI-shaped metadata on Completions and chat: object of string pairs, max 16.
• Keys ≤64 chars; values ≤512 chars; non-string entries fail closed.
• Completions ALLOWED_COMPLETIONS_KEYS includes metadata.
• Full tip substrate + HTTP tests.

Test plan

• python tests/test_completions_metadata_openai_shape.py (4/4 HTTP)
• CI Full unit + Semgrep

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📥 Commits

Reviewing files that changed from the base of the PR and between 6841b71 and 962a5eb.

📒 Files selected for processing (4)

• contextual_orchestrator/cost_ledger.py
• contextual_orchestrator/orchestrator.py
• contextual_orchestrator/server.py
• tests/test_completions_metadata_openai_shape.py

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