Refactor run in session

[ninan-nn]

Summary

• align the execd runInSession contract from code / timeout_ms to command / timeout, and update the execd server handlers accordingly
• regenerate and update SDK-facing models, then refactor Python / JavaScript / Kotlin / C# command adapters so run and runInSession share more of the streaming / SSE / exit-code handling logic
• remove the extra Kotlin SessionAdapter layer so createSession / deleteSession go through the generated CodeInterpretingApi, and keep handwritten transport only for the streaming session run path
• rename public session-facing SDK options from cwd to workingDirectory (working_directory in Python) while keeping the wire / generated API field as cwd
• update unit tests and e2e coverage across Python / JavaScript / Kotlin / C# / Java for session working-directory behavior and runInSession exit-code inference

Testing

• Not run (updating PR metadata only in this step; tests were added/updated in the branch but not executed in this session)
• Unit tests
• Integration tests
• e2e / manual verification

Breaking Changes

• None
• Yes (describe impact and migration path)
• the affected APIs are part of the new session capability introduced in this work; existing non-session command APIs are not being broken by this PR

Checklist

• Linked Issue or clearly described motivation
• Added/updated docs (if needed)
• Added/updated tests (if needed)
• Security impact considered
• Backward compatibility considered

[chatgpt-codex-connector]

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[Pangjiping]

LGTM

[hittyt]

LGTM