Relocate the four pure-data module trees into the improvise-core
sub-crate scaffolded in the previous commit. Phase A already made
these modules UI/IO-free; this commit is purely mechanical:
git mv src/format.rs -> crates/improvise-core/src/format.rs
git mv src/workbook.rs -> crates/improvise-core/src/workbook.rs
git mv src/model -> crates/improvise-core/src/model
git mv src/view -> crates/improvise-core/src/view
The moved code contains no path edits: the `crate::formula::*`,
`crate::model::*`, `crate::view::*`, `crate::workbook::*`,
`crate::format::*` imports inside the four trees all continue to
resolve because the new crate mirrors the same module layout and
re-exports improvise_formula under `formula` via its lib.rs.
Main-crate `src/lib.rs` flips from declaring these as owned modules
(`pub mod model;` etc.) to re-exporting them from improvise-core
(`pub use improvise_core::model;` etc.). This keeps every
`crate::model::*`, `crate::view::*`, `crate::workbook::*`,
`crate::format::*` path inside the 26 consumer files in src/ (ui,
command, persistence, import, draw, main) resolving unchanged — no
downstream edits needed.
Verification:
- cargo check --workspace: clean
- cargo test --workspace: 612 passing (357 main + 190 core + 65 formula)
- cargo clippy --workspace --tests: clean
- cargo build -p improvise-core: standalone build succeeds, confirming
zero UI/IO leakage into the core crate
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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