fix(cli): restore session cwd on resume (-c)

[MorAlekss]

Summary

Restores the session working directory when resuming a CLI session with -c.

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Root cause

_init_agent() in cli.py loaded conversation history and reopened the session in the DB but never restored the working directory. The sessions table already has a cwd column and update_session_cwd() exists, but the CLI path never wrote to or read from it, only the TUI gateway did.

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Behavioral change

Before: hermes -c / hermes --resume <id> restores conversation history but starts in the launch directory, ignoring any cd the agent performed during the previous session.

After: the working directory is restored to where the previous session left off.

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What changed

tools/terminal_tool.py

• Added get_live_terminal_cwd(task_id), a public getter for the terminal environment's live env.cwd. Symmetric with the existing register_task_env_overrides and clear_task_env_overrides pair.

run_agent.py

• _ensure_db_session(): passes cwd=os.getcwd() to create_session() so the initial working directory is persisted on session creation.
• _persist_session(): calls update_session_cwd() with the live terminal cwd after every turn so any cd performed during the session is persisted for the next resume.

cli.py

• _init_agent() resume block: reads session_meta["cwd"] and calls os.chdir() to restore the working directory before the agent starts. Follows design fix(cli): CLI/TUI on local backend always uses launch directory, ignores terminal.cwd #19242: local CLI backend does not touch TERMINAL_CWD, uses os.chdir() instead.

tests/cli/test_cli_resume_cwd.py

• 3 new tests in TestResumeCwdRestore: canary test that fails without the fix, guard for NULL cwd in pre-fix session rows, guard for deleted directory that must not crash.

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What is NOT changed

• Gateway and TUI sessions are unaffected, they already have their own cwd save/restore path in tui_gateway/server.py.
• TERMINAL_CWD is never modified, the local backend contract (fix(cli): CLI/TUI on local backend always uses launch directory, ignores terminal.cwd #19242) is preserved.

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Implements the fix discussed in Discord (May 31) following a user report about the agent losing its working directory after resume. @teknium1 noted: "this is a good point. I'll see if I can make resume and -c reload with the last working dir it was in."