id(world): F11.10 split world.rs, world_session.rs and cli.rs (moves only) #540

What and why

Split the three largest modules into focused files, box large command variants so cmd_world stays under a stack budget, with no behaviour change. Exit: no file over 2,500 production lines. The blocker (open platform stack #209-#248) has merged. The files have grown since the plan was written, and the open platform stack the split waited on has merged, so nothing blocks it now.

Source

• .opencode/plans/phase-11-foundations.md:48
• .opencode/plans/phase-11-foundations.md:72
• .opencode/plans/2026-10-20_phase-11-status.md:20

Current status

Not started. Regressed since the plan: pkgs/id/src/world.rs is 7,596 lines (plan: 6,120), first #[cfg(test)] at :4020, so ~4,019 production lines; world_session.rs 4,180 (tests at :2560); cli.rs 4,126 (tests at :2062). No pkgs/id/src/world/ directory. The stack it waited on is merged (PRs #209, #211, #239, #244, #247-#250, #256 MERGED).

Acceptance criteria

• world.rs, world_session.rs and cli.rs are split into focused modules; no file has over 2,500 production lines
• Large command variants are boxed so cmd_world stays under a stack budget
• Moves only: no behaviour change, and the existing test suite passes without edits to assertions

Size

L

Prerequisites

None.