ux: rename "Open a login shell" to "Open container shell" across agent roles

[eXPerience83]

Context

Remote Dev currently labels the general interactive shell action as:

Open a login shell

The implementation intentionally launches bash --login, so login shell is technically correct Bash terminology. However, in the menu it reads as if the shell were mainly for authentication/login tasks, while in practice it is the general-purpose interactive shell for the role container: diagnostics, inspection, recovery, manual commands and maintenance.

This became especially visible while using the Antigravity role for runtime/permission testing. The existing user guide already describes this action as a general shell rather than an agent launch.

Goal

Rename the user-facing action to:

Open container shell

without changing its runtime behavior.

Internally it should continue to launch the reviewed login-style Bash environment (bash --login) unless a separate issue changes that contract.

Scope

Apply the wording consistently to all current role menus and shared documentation:

• Codex;
• Antigravity;
• shell/fallback role where applicable;
• common/shared menu text, diagnostics/recovery guidance and tests;
• EN/ES documentation and user guide references.

Also establish Open container shell as the naming convention for future agent roles, including the planned/future Claude Code role, so new integrations do not reintroduce the old label.

Required behavior

This is a UX/text-only change:

• keep the command implementation as bash --login;
• do not change shell privileges, mounts, cwd, environment, hardening, tmux lifecycle or role isolation;
• preserve the existing post-shell secure-persistent-state hardening flow;
• preserve P0 data loss: enforce project-collection Git boundary for Codex and Antigravity #213 behavior where the shell remains available for manual inspection/recovery when managed project actions are blocked;
• do not turn this into an agent-specific login/authentication workflow.

Wording

Preferred English label:

Open container shell

Preferred Spanish wording in prose/docs where translated:

Abrir shell del contenedor

Keep literal menu strings synchronized wherever the UI intentionally remains English.

Tests

Update deterministic menu/tests that currently assert Open a login shell and add/retain coverage proving that selecting the renamed action still executes the same login-style Bash shell path and returns through the existing hardening/menu lifecycle.

Acceptance criteria

• Current Codex and Antigravity menus show Open container shell.
• Shared/fallback shell menu uses the same terminology where applicable.
• Future Claude Code integration guidance uses the same naming convention.
• EN/ES docs no longer describe the menu action with the misleading old label except where explaining historical terminology is useful.
• Runtime behavior remains bash --login; no security or lifecycle semantics change.