terminal_tool re-sent the init-time/config cwd on every command, clobbering
session-local `cd` state: the environment tracked the new directory in
`env.cwd`, but foreground/background calls forced the old cwd back. A small
`_resolve_command_cwd` resolver now applies the precedence
`workdir > live env.cwd > config/override cwd` to:
- foreground `env.execute(...)`
- background `process_registry.spawn_local(...)`
- background `process_registry.spawn_via_env(...)`
Additionally, syncing the cwd onto the live cached env when a `cwd` override is
(re-)registered. Preferring live `env.cwd` would otherwise demote the ACP
`update_cwd` override (registered via `register_task_env_overrides` on
`session/load` / `session/resume`) below an already-set `env.cwd`, silently
ignoring an editor's mid-session project-root change once any command had run.
`register_task_env_overrides` now pushes a new cwd onto the cached env so an
explicit ACP cwd change wins, while ordinary in-session `cd` tracking is
preserved.
Regression coverage:
- foreground/background commands follow live `env.cwd`
- explicit `workdir` still overrides everything
- registering a cwd override updates the live env cwd (ACP authority)
- no-op when no live env exists; non-cwd overrides leave env.cwd untouched
Based on #35510 by @Dusk1e.
Co-authored-by: Dusk1e <yusufalweshdemir@gmail.com>
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