Fix stale docs and align conventions across the AI samples

[brianstrauch]

A docs and consistency pass over the Strands, LangGraph, and Google ADK samples. No sample behavior changes.

Stale references

• strands_plugin/README.md: drop the note saying the strands extra "is shipping in an upcoming release" along with its uv pip install -e ../sdk-python fallback — pyproject.toml already pins temporalio[strands-agents,pydantic]>=1.30.0. (It also named the extra strands; the real name is strands-agents.)
• strands_plugin/tools/README.md: activity_as_tool is imported from temporalio.contrib.strands.workflow, not workflow.
• strands_plugin/continue_as_new/README.md: the workflow waits on is_continue_as_new_suggested() in a wait_condition, not after each turn.
• langgraph_plugin/graph_api/streaming/README.md: WorkflowStream linked to the docs.temporal.io root; point it at the SDK contrib/workflow_streams path.

Dev server links

Every dev server reference now links the unanchored https://docs.temporal.io/cli and shows the command, following external_storage/README.md. The repo previously had two forms: /cli#start-dev-server, whose anchor does not match any heading on that page, and /cli/server#start-dev.

Conventions

• TEMPORAL_ADDRESS — all 12 Google ADK scripts now read it with a localhost:7233 default, as the Strands and LangGraph samples already did.
• Run commands — Google ADK docs invoke scripts by path (uv run google_adk_agents/basic/run_worker.py) instead of uv run python -m google_adk_agents.basic.run_worker, matching the other suites.
• Typing — Optional[str] → str | None in the two Strands samples still using the old form; the rest of the suite already used it.

Other

• .github/CODEOWNERS: the /langgraph_plugin/ rule at the top of the file duplicated the one in the AI SDK section, which also covers /tests/langgraph_plugin/.

Verification

• ruff check (incl. import sort) and ruff format --check clean; mypy --check-untyped-defs --namespace-packages clean across 73 files.
• pytest tests/google_adk_agents tests/strands_plugin — 15 passed.
• The new path-form command was run for real (TEMPORAL_ADDRESS=127.0.0.1:1 python google_adk_agents/basic/run_worker.py): imports resolve, and it reaches a connection-refused as expected with no server running.
• Every markdown link in the three suites was fetched; all resolve.

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