fix: support /reasoning --global and cron reasoning overrides

[Alex-giao]

Summary

• share /reasoning argument parsing across CLI, gateway, and TUI so --global works consistently
• keep session-scoped reasoning overrides separate from persisted global config, including reset/restart paths
• let cron jobs store and honor per-job reasoning_effort with global fallback

Testing

• python -m pytest tests/cli/test_reasoning_command.py tests/gateway/test_reasoning_command.py tests/gateway/test_session_reasoning_reset.py tests/test_tui_gateway_server.py tests/tools/test_cronjob_tools.py -q -o addopts=""
• python -m pytest tests/cron/test_scheduler.py -q -o addopts="" -k "prefers_job_reasoning_effort_over_global_config or falls_back_to_global_reasoning_effort_when_job_unset"

Notes

• tests/cron/test_scheduler.py still has 4 pre-existing unrelated failures around silent delivery / empty-response handling on current main; I verified they reproduce in a clean worktree at HEAD, so they are not introduced by this PR.

[teknium1]

Thanks for covering all three interactive surfaces plus cron. The underlying gaps still exist on current main: CLI does not parse --global (hermes_cli/cli_commands_mixin.py:2481), TUI does not parse it (tui_gateway/server.py:10531), and cron reads only global reasoning effort (cron/scheduler.py:2865).

Problems

• The implementation predates command extraction: the live handlers are now hermes_cli/cli_commands_mixin.py:2469 and gateway/slash_commands.py:2634, so the cli.py and gateway/run.py hunks need a behavioral port rather than direct conflict resolution.
• The cron field is added only to cronjob; current cron also has CLI, API, and web creation/update paths. Those need the same validated field and documentation for a complete per-job feature.

Suggested changes

• Port the TUI logic to current create_reasoning_override / _make_agent(..., reasoning_config_override=...) flow (tui_gateway/server.py:4461, tui_gateway/server.py:10540).
• Preserve the existing CLI full/clamp branches while adding flag parsing.

Automated hermes-sweeper review.

[teknium1]

This exposes the override only to the model tool. Please carry the same validated field through the cron CLI, API-server, and web-server create/update paths (and the cron guide), or explicitly narrow the feature scope; users of those existing cron surfaces otherwise cannot create or edit the override.

[teknium1]

Both halves of this are now on main: /reasoning --global session/global scoping exists in gateway/run.py (_parse_reasoning_command_args), and per-job cron reasoning overrides landed via #91244 (43c6dac; first-submitter credit for the cron feature to @PavelTajdus in #30929 — your April PR predates even that and is credited here as the earliest exploration of cron reasoning overrides). Closing as implemented on main — thanks @Alex-giao.