fix(examples/multi_platform_seller): switch idempotency to unsupported

The new boot-time validator (validate_idempotency_wiring) caught the
multi-platform-seller example advertising IdempotencySupported(supported=True)
on both child platforms and the PlatformRouter union without any
@IdempotencyStore.wrap applied. That's the silent-lie configuration the
validator exists to catch — switch the mocks to IdempotencyUnsupported
to honestly reflect what they implement.

Real adopters with in-memory dedup keep supported=True and wrap their
mutating handlers; this example doesn't model that surface.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: bokelley

examples/multi_platform_seller/src/app.py

@@ -41,7 +41,7 @@
 from adcp.decisioning.capabilities import Account as CapabilitiesAccount
 from adcp.decisioning.capabilities import (
     Adcp,
-    IdempotencySupported,
+    IdempotencyUnsupported,
     MediaBuy,
     SupportedProtocol,
 )
@@ -76,7 +76,11 @@ def build_router() -> PlatformRouter:
         specialisms=["sales-guaranteed", "sales-non-guaranteed"],
         adcp=Adcp(
             major_versions=[3],
-            idempotency=IdempotencySupported(supported=True, replay_ttl_seconds=86400),
+            # Router union over two mock platforms — neither wires
+            # in-memory dedup, so the union honestly advertises
+            # unsupported. Real adopters wrap mutating handlers with
+            # @IdempotencyStore.wrap and declare supported=True.
+            idempotency=IdempotencyUnsupported(supported=False),
         ),
         account=CapabilitiesAccount(supported_billing=["operator"]),
         media_buy=MediaBuy(supported_pricing_models=["cpm"]),

examples/multi_platform_seller/src/mock_guaranteed.py

@@ -30,7 +30,7 @@
 from adcp.decisioning.capabilities import Account as CapabilitiesAccount
 from adcp.decisioning.capabilities import (
     Adcp,
-    IdempotencySupported,
+    IdempotencyUnsupported,
     MediaBuy,
     SupportedProtocol,
 )
@@ -131,7 +131,12 @@ class MockGuaranteedPlatform(DecisioningPlatform, SalesPlatform):
         specialisms=["sales-guaranteed"],
         adcp=Adcp(
             major_versions=[3],
-            idempotency=IdempotencySupported(supported=True, replay_ttl_seconds=86400),
+            # Mock platform: no in-memory dedup wired. Honest declaration
+            # over a silent-lie supported=True (the SDK's boot-time
+            # validator at adcp.decisioning.validate_idempotency catches
+            # the latter). Real adopters wrap mutating handlers with
+            # @IdempotencyStore.wrap and declare supported=True.
+            idempotency=IdempotencyUnsupported(supported=False),
         ),
         account=CapabilitiesAccount(supported_billing=["operator"]),
         media_buy=MediaBuy(supported_pricing_models=["cpm"]),

examples/multi_platform_seller/src/mock_non_guaranteed.py

@@ -32,7 +32,7 @@
 from adcp.decisioning.capabilities import Account as CapabilitiesAccount
 from adcp.decisioning.capabilities import (
     Adcp,
-    IdempotencySupported,
+    IdempotencyUnsupported,
     MediaBuy,
     SupportedProtocol,
 )
@@ -118,7 +118,12 @@ class MockNonGuaranteedPlatform(DecisioningPlatform, SalesPlatform):
         specialisms=["sales-non-guaranteed"],
         adcp=Adcp(
             major_versions=[3],
-            idempotency=IdempotencySupported(supported=True, replay_ttl_seconds=86400),
+            # Mock platform: no in-memory dedup wired. Honest declaration
+            # over a silent-lie supported=True (the SDK's boot-time
+            # validator at adcp.decisioning.validate_idempotency catches
+            # the latter). Real adopters wrap mutating handlers with
+            # @IdempotencyStore.wrap and declare supported=True.
+            idempotency=IdempotencyUnsupported(supported=False),
         ),
         account=CapabilitiesAccount(supported_billing=["operator"]),
         media_buy=MediaBuy(supported_pricing_models=["cpm"]),