mize/docs/plans/2026-11-04-load-part-at-instances.md

load_part_at instances (priv.spacetime / ppc.spacetime)

Approved 2026-11-04.

Goal

Instantiate the same spacetime .so under different part ids (priv.spacetime, ppc.spacetime), each with its own config namespace. Dependents use Spacetime::get("priv.spacetime") etc.

Changes

1. Platform load_part(part_name, path, at_id) via get_global_mize(); save/restore cur_eval_part.
2. Rename Mize::load_part_at → load_part_from_path.
3. config::load_part_at(at_id, part_name) — no-op in generate mode.
4. Codegen: special SpacetimeDB client gen when gen contains "spacetime", module at {cwd}/spacetime if present.
5. sci: gen += spacetime, load_part_at("priv.spacetime", "spacetime").
6. New mize/parts/ppc: loads ppc.spacetime.