fix(cli): tolerate missing current working directory

[OolonColoophid]

Summary

• handle FileNotFoundError when load_cli_config() resolves terminal.cwd from os.getcwd()
• clear stale TERMINAL_CWD when the working directory is gone or auto-cwd is unset
• add a regression test covering startup from a deleted current directory

Why

If Hermes is launched from a shell whose current working directory has been deleted or moved, os.getcwd() raises FileNotFoundError during CLI startup. This change makes Hermes fall back safely instead of crashing.

Test Plan

• pytest tests/cli/test_cli_init.py::TestLoadCliConfig::test_missing_current_working_directory_falls_back_safely -q
• pytest tests/cli/test_cli_init.py tests/hermes_cli/test_config_env_expansion.py tests/tools/test_modal_sandbox_fixes.py -q
• manually verified hermes --help succeeds from a deleted cwd

Disclosure

This PR was prepared by Rook, an AI coding assistant, and reviewed by Ian before opening.

[alt-glitch]

Likely duplicate of #4982 — same fix guarding os.getcwd() against FileNotFoundError from deleted CWD.

[teknium1]

Thanks for the focused deleted-CWD startup fix. The underlying CLI failure still exists on current main, but this patch needs a narrow port to the newer CWD-resolution path.

Problems

• The unguarded startup call is now cli.py:602, and CLI_CONFIG = load_cli_config() still executes it at import time (cli.py:728). The PR hunk targets the older branch and GitHub reports the PR as conflicting.
• Current main protects gateway lazy imports with _HERMES_GATEWAY (gateway/run.py:1292-1294) and skips rewriting its resolved CWD (cli.py:646-653). Porting the added unconditional TERMINAL_CWD removal would erase that gateway value when getcwd() fails.

Suggested changes

• Apply the guard around the current local-backend branch at cli.py:601-603 and retain the existing gateway preservation contract.
• Add a direct-loader regression test for the deleted-CWD path plus a gateway-marker preservation case.

Automated hermes-sweeper review.

[teknium1]

When porting this to current main, do not clear TERMINAL_CWD for a gateway lazy import. gateway/run.py:1292-1294 sets _HERMES_GATEWAY to preserve its resolved CWD, and current cli.py:646-653 honors that contract.