permissions: canonicalize workspace_roots and danger-full-access names (#22624)

## Why

This is a small precursor to the larger permissions-migration work. Both
the comparison stack in
[#22401](https://github.com/openai/codex/pull/22401) /
[#22402](https://github.com/openai/codex/pull/22402) and the alternate
stack in [#22610](https://github.com/openai/codex/pull/22610) /
[#22611](https://github.com/openai/codex/pull/22611) /
[#22612](https://github.com/openai/codex/pull/22612) are easier to
review if the terminology is already settled underneath them.

Because `:project_roots` and `:danger-no-sandbox` have not shipped as
stable user-facing surface area, carrying them forward as aliases would
just add more migration logic to the later stacks. This PR removes that
ambiguity now so the follow-on work can rely on one spelling for each
built-in concept.

## What Changed

- renamed the config-facing special filesystem key from `:project_roots`
to `:workspace_roots`
- dropped unpublished `:project_roots` parsing support in
`core/src/config/permissions.rs`, so new config only recognizes
`:workspace_roots`
- renamed the built-in full-access permission profile id from
`:danger-no-sandbox` to `:danger-full-access`
- dropped unpublished `:danger-no-sandbox` support entirely, including
the old active-profile canonicalization path, and added explicit
rejection coverage for the legacy id
- introduced shared built-in permission-profile id constants in
`codex-rs/protocol/src/models.rs`
- updated `core`, `app-server`, and `tui` call sites that special-case
built-in profiles to use the shared constants and canonical ids
- updated tests and the Linux sandbox README to use `:workspace_roots` /
`:danger-full-access`

## Verification

I focused verification on the three places this rename can regress:
config parsing, active-profile identity surfaced back out of `core`, and
user/server call sites that special-case built-in profiles.

Targeted checks:

-
`config::tests::default_permissions_can_select_builtin_profile_without_permissions_table`
-
`config::tests::default_permissions_read_only_applies_additional_writable_roots_as_modifications`
-
`config::tests::default_permissions_can_select_builtin_full_access_profile`
- `config::tests::legacy_danger_no_sandbox_is_rejected`
- `workspace_root` filtered `codex-core` tests
-
`request_processors::thread_processor::thread_processor_tests::thread_processor_behavior_tests::requested_permissions_trust_project_uses_permission_profile_intent`
-
`suite::v2::turn_start::turn_start_rejects_invalid_permission_selection_before_starting_turn`
- `status::tests::status_snapshot_shows_auto_review_permissions`
-
`status::tests::status_permissions_full_disk_managed_with_network_is_danger_full_access`
-
`app_server_session::tests::embedded_turn_permissions_use_active_profile_selection`

codex-rs/app-server/tests/suite/v2/command_exec.rs

@@ -306,7 +306,7 @@ async fn command_exec_permission_profile_project_roots_use_command_cwd() -> Resu
     );
     assert!(
         !codex_home.path().join("parent.txt").exists(),
-        "permissionProfile :project_roots write should not grant the server cwd when command cwd differs"
+        "permissionProfile :workspace_roots write should not grant the server cwd when command cwd differs"
     );
 
     Ok(())

codex-rs/app-server/tests/suite/v2/turn_start.rs

@@ -62,6 +62,7 @@ use codex_protocol::config_types::ModeKind;
 use codex_protocol::config_types::Personality;
 use codex_protocol::config_types::ReasoningSummary;
 use codex_protocol::config_types::Settings;
+use codex_protocol::models::BUILT_IN_PERMISSION_PROFILE_DANGER_FULL_ACCESS;
 use codex_protocol::openai_models::ReasoningEffort;
 use codex_protocol::user_input::MAX_USER_INPUT_TEXT_CHARS;
 use core_test_support::responses;
@@ -780,7 +781,7 @@ async fn turn_start_rejects_invalid_permission_selection_before_starting_turn()
                 text_elements: Vec::new(),
             }],
             permissions: Some(PermissionProfileSelectionParams::Profile {
-                id: ":danger-no-sandbox".to_string(),
+                id: BUILT_IN_PERMISSION_PROFILE_DANGER_FULL_ACCESS.to_string(),
                 modifications: None,
             }),
             ..Default::default()