fix: OpenAI 1:1 spec-compat reconciliation (interfaze#218)

[Abhinavexist]

Closes #14. Consolidates the SDK-side reconciliation against server PR InterfazeAI/interfaze#218 (OpenAI 1:1 spec-compat, deploying). Supersedes #13 and #15.

Full audit: interfaze-py was checked against all six #218 fixes. Most SDK workarounds are backward-compat that no-op post-deploy (kept, not removed). Two items needed SDK changes:

1. Streaming json_object fence (deploy-independent bug)

Non-stream create() unwraps the ```json fence Interfaze wraps json_object output in, but the streaming path didn't: stream() discarded the strip flag and _State.build() never unwrapped it, so get_final_completion() leaked the fence.

Fix: thread the strip flag from stream() into InterfazeStream/AsyncInterfazeStream and apply strip_json_fence in build(); scoped to the aggregated result (live-delta path untouched — incrementally-fenced JSON isn't a real usage). Moved strip_json_fence into _stream.py to avoid a circular import. Pre-#218 this fixes the current leak; post-#218 it no-ops on already-bare JSON.

2. max_completion_tokens + models endpoints (#218 deploying)

• max_completion_tokens — #218 honors it as an alias for max_tokens (max_tokens wins if both set). Updated the README "Good to know" bullet that said to avoid it. No code change (params pass through); ChatInterfaze's ChatOpenAI rename is now honored, not a silent no-op.
• models — #218 gives GET /v1/models the OpenAI envelope and adds GET /v1/models/{id}. Added tests/test_models.py locking in models.list() (with owned_by), models.retrieve(), and the spec-shaped model_not_found 404.

Not changed (verified non-findings for Python)

• Streaming delta.role: the accumulator already tolerates missing role; kept.
• choice.logprobs: openai-python defaults it to None — never broke parsing.
• models.list() shape: openai-python parsed the old OpenRouter shape fine; #218 just enriches it.

Tests

30 passing (streaming fence: stripped in json_object, preserved otherwise, async; models: list/retrieve/not-found). ruff + mypy --strict clean.

[Khurdhula-Harshavardhan]

please help resolve the following.

[Abhinavexist]

Rebased onto current main (post #7–#11). ⚠️ Note: #16 and #20 both touch src/interfaze/_stream.py; whichever merges second needs a quick re-rebase (see #20 for detail).

[Khurdhula-Harshavardhan]

please help resolve the following.

[Abhinavexist]

Nit addressed in a835bb4: .text now strips the json_object fence too (matching get_final_completion()), with a test.