chore(release): co-version agentex-sdk (adk) at 0.11.5

Rebased onto next, which released 0.11.5. Both packages co-version: the
manifest, the slim client pyproject, and the adk pyproject all read 0.11.5.
release-please's include-component-in-tag keeps the tags distinct
(agentex-sdk-client-v0.11.5 vs agentex-sdk-v0.11.5).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: max-parke-scale

adk/pyproject.toml

@@ -7,7 +7,7 @@
 # This entire `adk/` directory must be preserved across Stainless codegen
 # via `keep_files: ["adk/**"]` in the Stainless dashboard config.
 name = "agentex-sdk"
-version = "0.11.4"
+version = "0.11.5"
 description = "Agent Development Kit (ADK) overlay for the Agentex API — FastACP server, Temporal workflows, LLM provider integrations, observability"
 license = "Apache-2.0"
 authors = [