Split input/editor.rs

Status: Partially implemented — console editor input has been reduced, but crates/jackin-console/src/tui/input/editor.rs remains a large root dispatcher and still needs a final tab/modal split

Shipped facts

crates/jackin-console/src/tui/input/editor.rs is now 1,146 lines, much smaller than the original multi-thousand-line file. The larger split into screens, components, and services has landed, and general.rs, agents.rs, secrets.rs, modal.rs, and tests.rs exist as child modules under crates/jackin-console/src/tui/input/editor/:

crates/jackin-console/src/tui/input/editor.rs          ← root dispatcher for editor keys and modal routing
crates/jackin-console/src/tui/input/editor/general.rs  ← General tab handlers
crates/jackin-console/src/tui/input/editor/agents.rs   ← Agents tab handlers (role input, allowed/default toggles)
crates/jackin-console/src/tui/input/editor/secrets.rs  ← Secrets/op-reference handlers
crates/jackin-console/src/tui/input/editor/modal.rs    ← modal commit handling

dispatch_editor_secrets_action and dispatch_editor_role_action in the root file already delegate straight through to secrets::* and agents::*. dispatch_editor_mount_action and dispatch_editor_mount_dst_choice do not — mount add/remove/isolation/GitHub-open handling and mount-destination-picker commit logic still live inline in the root file. That is the actual remaining gap: not a whole-console extraction, but a root dispatcher still carrying mount-tab behavior alongside true cross-tab dispatch.

Use Rust 2024 self-named module layout. Do not create mod.rs.

Remaining work

1. Add crates/jackin-console/src/tui/input/editor/mounts.rs and move dispatch_editor_mount_action and dispatch_editor_mount_dst_choice (plus their private helpers) there, following the general.rs/agents.rs/secrets.rs pattern already used for the other tabs.
2. Preserve existing key behavior exactly; the root dispatcher should call into mounts::* the same way it already calls into secrets::* and agents::*.
3. Keep tests in editor/tests.rs; do not split tests into child modules.
4. Verify with targeted Rust tests for the console editor input paths.

Auditability gain

To audit "did the Secrets tab handle op:// references correctly?", a reviewer should read a secrets-focused input file instead of the root dispatcher plus unrelated General/Mounts/Agents key paths.