fix(core,model-profiles): add missing ModelProfile fields, warn on schema drift (#36129)

PR #35788 added 7 new fields to the `langchain-profiles` CLI output
(`name`, `status`, `release_date`, `last_updated`, `open_weights`,
`attachment`, `temperature`) but didn't update `ModelProfile` in
`langchain-core`. Partner packages like `langchain-aws` that set
`extra="forbid"` on their Pydantic models hit `extra_forbidden`
validation errors when Pydantic encountered undeclared TypedDict keys at
construction time. This adds the missing fields, makes `ModelProfile`
forward-compatible, provides a base-class hook so partners can stop
duplicating model-profile validator boilerplate, migrates all in-repo
partners to the new hook, and adds runtime + CI-time warnings for schema
drift.

## Changes

### `langchain-core`
- Add `__pydantic_config__ = ConfigDict(extra="allow")` to
`ModelProfile` so unknown profile keys pass Pydantic validation even on
models with `extra="forbid"` — forward-compatibility for when the CLI
schema evolves ahead of core
- Declare the 7 missing fields on `ModelProfile`: `name`, `status`,
`release_date`, `last_updated`, `open_weights` (metadata) and
`attachment`, `temperature` (capabilities)
- Add `_warn_unknown_profile_keys()` in `model_profile.py` — emits a
`UserWarning` when a profile dict contains keys not in `ModelProfile`,
suggesting a core upgrade. Wrapped in a bare `except` so introspection
failures never crash model construction
- Add `BaseChatModel._resolve_model_profile()` hook that returns `None`
by default. Partners can override this single method instead of
redefining the full `_set_model_profile` validator — the base validator
calls it automatically
- Add `BaseChatModel._check_profile_keys` as a separate
`model_validator` that calls `_warn_unknown_profile_keys`. Uses a
distinct method name so partner overrides of `_set_model_profile` don't
inadvertently suppress the check

### `langchain-profiles` CLI
- Add `_warn_undeclared_profile_keys()` to the CLI (`cli.py`), called
after merging augmentations in `refresh()` — warns at profile-generation
time (not just runtime) when emitted keys aren't declared in
`ModelProfile`. Gracefully skips if `langchain-core` isn't installed
- Add guard test
`test_model_data_to_profile_keys_subset_of_model_profile` in
model-profiles — feeds a fully-populated model dict to
`_model_data_to_profile()` and asserts every emitted key exists in
`ModelProfile.__annotations__`. CI fails before any release if someone
adds a CLI field without updating the TypedDict

### Partner packages
- Migrate all 10 in-repo partners to the `_resolve_model_profile()`
hook, replacing duplicated `@model_validator` / `_set_model_profile`
overrides: anthropic, deepseek, fireworks, groq, huggingface, mistralai,
openai (base + azure), openrouter, perplexity, xai
- Anthropic retains custom logic (context-1m beta → `max_input_tokens`
override); all others reduce to a one-liner
- Add `pr_lint.yml` scope for the new `model-profiles` package

libs/model-profiles/langchain_model_profiles/cli.py

@@ -5,8 +5,9 @@ import json
 import re
 import sys
 import tempfile
+import warnings
 from pathlib import Path
-from typing import Any
+from typing import Any, get_type_hints
 
 import httpx
 
@@ -150,6 +151,38 @@ def _apply_overrides(
     return merged
 
 
+def _warn_undeclared_profile_keys(
+    profiles: dict[str, dict[str, Any]],
+) -> None:
+    """Warn if any profile keys are not declared in `ModelProfile`.
+
+    Args:
+        profiles: Mapping of model IDs to their profile dicts.
+    """
+    try:
+        from langchain_core.language_models.model_profile import ModelProfile
+    except ImportError:
+        # langchain-core may not be installed or importable; skip check.
+        return
+
+    try:
+        declared = set(get_type_hints(ModelProfile).keys())
+    except (TypeError, NameError):
+        # get_type_hints raises NameError on unresolvable forward refs and
+        # TypeError when annotations evaluate to non-type objects.
+        return
+    extra = sorted({k for p in profiles.values() for k in p} - declared)
+    if extra:
+        warnings.warn(
+            f"Profile keys not declared in langchain_core ModelProfile: {extra}. "
+            f"Add these fields to "
+            f"langchain_core.language_models.model_profile.ModelProfile and "
+            f"release langchain-core before publishing partner packages that "
+            f"use these profiles.",
+            stacklevel=2,
+        )
+
+
 def _ensure_safe_output_path(base_dir: Path, output_file: Path) -> None:
     """Ensure the resolved output path remains inside the expected directory."""
     if base_dir.exists() and base_dir.is_symlink():
@@ -300,6 +333,8 @@ def refresh(provider: str, data_dir: Path) -> None:  # noqa: C901, PLR0915
     for model_id in sorted(extra_models):
         profiles[model_id] = _apply_overrides({}, provider_aug, model_augs[model_id])
 
+    _warn_undeclared_profile_keys(profiles)
+
     # Ensure directory exists
     try:
         data_dir.mkdir(parents=True, exist_ok=True, mode=0o755)