[ai] fix: replace private _state API with public session.process:write(nil)

[pablopunk]

What

Replace private Neovim internal API (session.process._state.stdin:close()) with the public session.process:write(nil) API.

Found by

Scanner — bug: uses private _state API for stdin access in runner

Fix

• Replaced _state.stdin:close() with session.process:write(nil) in runner.lua M.finish
• Retained pcall protection and kill(15) fallback for robustness
• Updated test mock to handle write(nil) and set stdin_closed flag
• Removed stale _state mock fields from test setup

Tested

• make test passes (33 cases, 0 fails)

🤖 [ai] — auto-fix by Hermes Autonomous Orchestrator

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: cb7ba7d8-212b-48b4-8af7-523c1bca7dd0

📥 Commits

Reviewing files that changed from the base of the PR and between 4ba6db0 and 2612b30.

📒 Files selected for processing (2)

• lua/pi/runner.lua
• tests/test_pi_commands.lua

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[pablopunk]

@codex review this and tell me why would we need this

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Delightful!

Reviewed commit: 2612b305fd

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