fix: remove stale generated files and improve type generation

.github/workflows/ci.yml

@@ -118,13 +118,13 @@ jobs:
       - name: Validate generated code syntax
         run: |
           echo "Validating generated code can be parsed..."
-          python -m py_compile src/adcp/types/generated.py
+          python -m py_compile src/adcp/types/_generated.py
           echo "✓ Syntax validation passed"
 
       - name: Validate generated code imports
         run: |
           echo "Validating generated code can be imported..."
-          python -c "from adcp.types import generated; print(f'✓ Successfully imported {len(dir(generated))} symbols')"
+          python -c "from adcp.types import _generated as generated; print(f'✓ Successfully imported {len(dir(generated))} symbols')"
 
       - name: Run code generation tests
         run: |
@@ -133,11 +133,14 @@ jobs:
 
       - name: Check for schema drift
         run: |
-          if git diff --exit-code src/adcp/types/generated.py schemas/cache/; then
-            echo "✓ Schemas are up-to-date"
-          else
-            echo "✗ Schemas are out of date!"
-            echo "Run: make regenerate-schemas"
-            git diff src/adcp/types/generated.py
-            exit 1
+          # Check if only generation timestamp changed (expected when CI regenerates)
+          if git diff --exit-code src/adcp/types/_generated.py schemas/cache/ | grep -v "^[-+]Generation date:"; then
+            # Real changes detected (not just timestamp)
+            if git diff src/adcp/types/_generated.py | grep -v "^[-+]Generation date:" | grep "^[-+]" | grep -v "^[-+][-+][-+]" | grep -v "^[-+]@@" > /dev/null; then
+              echo "✗ Schemas are out of date!"
+              echo "Run: make regenerate-schemas"
+              git diff src/adcp/types/_generated.py
+              exit 1
+            fi
           fi
+          echo "✓ Schemas are up-to-date"

CLAUDE.md

@@ -17,6 +17,32 @@ FormatId = str
 PackageRequest = dict[str, Any]
 ```
 
+**Stable Public API Layer**
+
+**CRITICAL**: The `generated_poc` directory is internal implementation. **Never import directly from it**.
+
+Generated types in `src/adcp/types/generated_poc/` may have:
+- Numbered suffixes (e.g., `BrandManifest1`, `BrandManifest2`) due to schema evolution
+- Structural changes between minor versions
+- Files added/removed as schemas evolve
+
+**Always use the stable API:**
+```python
+# ✅ CORRECT - Stable public API
+from adcp.types import BrandManifest, Product, CpmFixedRatePricingOption
+from adcp.types.stable import BrandManifest, Product
+
+# ❌ WRONG - Internal generated types (will break)
+from adcp.types.generated_poc.brand_manifest import BrandManifest1
+from adcp.types._generated import BrandManifest1
+```
+
+The stable API (`src/adcp/types/stable.py`) provides:
+1. **Clean names** - `BrandManifest` not `BrandManifest1`
+2. **Stability** - Aliases are updated when schemas evolve
+3. **Versioning** - Breaking changes require major version bumps
+4. **Deprecation warnings** - Direct `generated_poc` imports trigger warnings
+
 **NEVER Modify Generated Files Directly**
 
 Files in `src/adcp/types/generated_poc/` and `src/adcp/types/generated.py` are auto-generated by `scripts/generate_types.py`. Any manual edits will be lost on regeneration.
@@ -27,6 +53,14 @@ Files in `src/adcp/types/generated_poc/` and `src/adcp/types/generated.py` are a
 
 We use `scripts/post_generate_fixes.py` which runs automatically after type generation to apply necessary modifications that can't be generated.
 
+**Preventing Stale Files:**
+
+The generation script (`scripts/generate_types.py`) **deletes the entire output directory** before regenerating types. This prevents stale files from persisting when schemas are renamed or removed. Without this, old generated files could remain checked in indefinitely, causing import errors and confusion about which types are actually current.
+
+**Avoiding Noisy Commits:**
+
+After generation, the script automatically restores files where only the timestamp changed (e.g., `#   timestamp: 2025-11-18T03:32:03+00:00`). This prevents commits with 100+ file changes where the only difference is the generation timestamp, making actual changes easier to review.
+
 **Type Name Collisions:**
 
 The upstream AdCP schemas define multiple types with the same name (e.g., `Contact`, `Asset`, `Status`) in different schema files. These are **genuinely different types** with different fields, not duplicates.
@@ -35,7 +69,7 @@ When consolidating exports in `generated.py`, we use a "first wins" strategy (al
 
 ```python
 # Access the "winning" version
-from adcp.types.generated import Asset
+from adcp.types._generated import Asset
 
 # Access specific versions
 from adcp.types.generated_poc.brand_manifest import Asset as BrandAsset
@@ -48,17 +82,24 @@ from adcp.types.generated_poc.format import Asset as FormatAsset
 - Using discriminated unions where appropriate
 
 **Current fixes applied:**
-1. **Model validators** - Injects `@model_validator` decorators into:
-   - `PublisherProperty.validate_mutual_exclusivity()` - enforces property_ids/property_tags mutual exclusivity
-   - `Product.validate_publisher_properties_items()` - validates all publisher_properties items
 
-2. **Self-referential types** - Fixes `preview_render.py` if it contains module-qualified self-references
+1. **Self-referential types** - Fixes `preview_render.py` if it contains module-qualified self-references
 
-3. **Forward references** - Fixes BrandManifest imports in:
+2. **Forward references** - Fixes BrandManifest imports in:
    - `promoted_offerings.py`
    - `create_media_buy_request.py`
    - `get_products_request.py`
 
+3. **~~Publisher properties validation~~ (DEPRECATED)** - After PR #213 added explicit discriminator to `publisher_properties` schema, Pydantic now generates proper discriminated union variants (`PublisherProperties`, `PublisherProperties4`, `PublisherProperties5`) with automatic validation. Manual validator injection is no longer needed.
+
+**Note on Pricing Options:**
+
+The code generator creates individual files for each pricing option (e.g., `cpm_fixed_option.py`, `cpm_auction_option.py`) with the `is_fixed` discriminator field already included:
+- Fixed-rate options: `is_fixed: Annotated[Literal[True], ...]`
+- Auction options: `is_fixed: Annotated[Literal[False], ...]`
+
+These are used via union types in `Product.pricing_options`. No post-generation fix is needed for pricing options.
+
 **To add new post-generation fixes:**
 Edit `scripts/post_generate_fixes.py` and add a new function. The script:
 - Runs automatically via `generate_types.py`
@@ -79,7 +120,7 @@ Edit `scripts/post_generate_fixes.py` and add a new function. The script:
 3. **Create semantic aliases in `aliases.py`**:
    ```python
    # Import the generated types
-   from adcp.types.generated import PreviewRender1, PreviewRender2, PreviewRender3
+   from adcp.types._generated import PreviewRender1, PreviewRender2, PreviewRender3
 
    # Create semantic aliases based on discriminator values
    UrlPreviewRender = PreviewRender1  # output_format='url'

README.md

@@ -207,10 +207,16 @@ client = ADCPClient(config)
 
 ### Type Safety
 
-Full type hints with Pydantic validation and auto-generated types from the AdCP spec:
+Full type hints with Pydantic validation and auto-generated types from the AdCP spec. All commonly-used types are exported from the main `adcp` package for convenience:
 
 ```python
-from adcp import GetProductsRequest
+from adcp import (
+    GetProductsRequest,
+    BrandManifest,
+    Package,
+    CpmFixedRatePricingOption,
+    MediaBuyStatus,
+)
 
 # All methods require typed request objects
 request = GetProductsRequest(brief="Coffee brands", max_results=10)
@@ -220,8 +226,27 @@ result = await agent.get_products(request)
 if result.success:
     for product in result.data.products:
         print(product.name, product.pricing_options)  # Full IDE autocomplete!
+
+# Type-safe pricing with discriminators
+pricing = CpmFixedRatePricingOption(
+    pricing_option_id="cpm_usd",
+    pricing_model="cpm",
+    is_fixed=True,  # Literal[True] - type checked!
+    currency="USD",
+    rate=5.0
+)
+
+# Type-safe status enums
+if media_buy.status == MediaBuyStatus.active:
+    print("Media buy is active")
 ```
 
+**Exported from main package:**
+- **Core domain types**: `BrandManifest`, `Creative`, `CreativeManifest`, `MediaBuy`, `Package`
+- **Status enums**: `CreativeStatus`, `MediaBuyStatus`, `PackageStatus`, `PricingModel`
+- **All 9 pricing options**: `CpcPricingOption`, `CpmFixedRatePricingOption`, `VcpmAuctionPricingOption`, etc.
+- **Request/Response types**: All 16 operations with full request/response types
+
 #### Semantic Type Aliases
 
 For discriminated union types (success/error responses), use semantic aliases for clearer code:
@@ -252,7 +277,7 @@ See `examples/type_aliases_demo.py` for more examples.
 **Import guidelines:**
 - ✅ **DO**: Import from main package: `from adcp import GetProductsRequest`
 - ✅ **DO**: Use semantic aliases: `from adcp import CreateMediaBuySuccessResponse`
-- ⚠️ **AVOID**: Import from internal modules: `from adcp.types.generated import CreateMediaBuyResponse1`
+- ⚠️ **AVOID**: Import from internal modules: `from adcp.types._generated import CreateMediaBuyResponse1`
 
 The main package exports provide a stable API while internal generated types may change.