Add configurable session idle timeout option (#1093) * Add sessionIdleTimeoutMs option to CopilotClientOptions Add a new optional sessionIdleTimeoutMs field to CopilotClientOptions that allows consumers to configure the server-wide session idle timeout. When set to a positive value, the SDK passes --session-idle-timeout to the CLI process. Sessions have no idle timeout by default (infinite lifetime). The minimum configurable value is 300000ms (5 minutes). Also updates the session persistence documentation to reflect the new default behavior and configuration option. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * refactor: rename sessionIdleTimeoutMs to sessionIdleTimeoutSeconds Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * fix: correct @default tag for sessionIdleTimeoutSeconds Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * fix: format client.ts with prettier Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * feat: add sessionIdleTimeoutSeconds to Go, Python, and .NET SDKs Add the session idle timeout option across all remaining SDK languages, consistent with the Node.js implementation and the runtime CLI's --session-idle-timeout flag. - Go: SessionIdleTimeoutSeconds int on ClientOptions - Python: session_idle_timeout_seconds on SubprocessConfig - .NET: SessionIdleTimeoutSeconds int? on CopilotClientOptions Each SDK passes --session-idle-timeout to the CLI when the value is positive, and omits it otherwise (disabled by default). Includes unit tests for all three languages and updates the .NET clone test to cover the new property. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * docs: add external-server caveat to Node.js and Python idle timeout docs Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * test: add Node.js unit tests for sessionIdleTimeoutSeconds Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * fix: format test_client.py with ruff Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * docs: remove incorrect minimum value from idle timeout docs The runtime does not enforce a minimum value for the session idle timeout - any positive value is accepted. Remove the 'Minimum value: 300 (5 minutes)' note from all SDK docstrings and docs. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * fix: copy SessionIdleTimeoutSeconds unconditionally in Go NewClient() The option was only copied when > 0, which silently normalized negative inputs. Other SDKs preserve the caller's value and gate only at spawn time. Align Go to match. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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