docs(graphs): fix graph workflow samples and behavior claims

[GWeale]

Corrections to the docs/graphs/ pages (plus one note on docs/workflows/patterns.md) where Python samples could not run as written and documented behavior did not match v2.5.0.

Changes

• docs/graphs/dynamic.md — a node that yields is an async generator, so the sample's bare return code emitted nothing; it now yields Event(output=code). Also FunctionNode(func=...) as a keyword, @node(rerun_on_resume=True) on workflow nodes, and the parallel sample no longer takes a real_node argument no caller could supply — it defines the worker node and passes use_sub_branch=True.
• docs/graphs/index.md — live streaming was listed as flatly unsupported. It is the default single_turn node mode that ignores the live request queue; nodes in task or chat mode can stream.
• docs/graphs/data-handling.md — dropped the {CityTime.time_info} / <field from node> data-selection syntax, which does not exist; instruction placeholders are substituted from session state, so an unmatched one is left in the prompt verbatim. Also corrected the multi-yield description (each yield emits a separate Event and only one may carry output) and the state-print / node-input parameter names.
• docs/graphs/routes.md — JoinNode waits on upstream completion, not output (completing with no output gives None; a node that never runs stalls the join). A workflow may have at most one output-producing terminal node, else ValueError. chat mode agents are only allowed directly after START, and a cycle needs at least one routed edge; the loop sample now actually loops.
• docs/graphs/human-input.md — replaced the RequestInput sample with the tool-confirmation API (FunctionTool(..., require_confirmation=True) and tool_context.request_confirmation()), and linked the full confirmation page.
• docs/workflows/patterns.md — added a note that SequentialAgent, ParallelAgent and LoopAgent are deprecated in Python and emit a DeprecationWarning.

How this was produced

Part of a page-by-page audit of the Python docs against the google/adk-python v2.5.0 source: every import resolved against a real 2.5.0 install, every constructor kwarg checked against model_fields / inspect.signature, every documented default read off the field. A second independent pass re-derived each claim from source rather than trusting the finding, and a third conformed the new wording to the surrounding pages. mkdocs build --strict is clean.

Only Python tabs and language-neutral prose were touched — this audit had no ground truth for the Go / Java / TypeScript SDKs.

Split out of a larger audit branch so each area can be reviewed on its own.

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