First tranche of the F-016 split of the 15k-line src/lua_bindings.rs.
Deliberately minimal — it validates the mechanics before bulk moves.
- Convert src/lua_bindings.rs → src/lua_bindings/mod.rs (the
`pub mod lua_bindings;` in lib.rs resolves to mod.rs unchanged).
- Extract the pmacs.diag surface (diagnostic_to_lua + install_diag) into
src/lua_bindings/diag.rs, moved verbatim. mod.rs declares `mod diag;`
and its one internal call site is now `diag::install_diag(...)`.
Pure code motion: no logic, signature, or behavior change. diag.rs reaches
shared-core items (BufferIdLua, SharedCore) via `super::` — a child module
can see its ancestors' private items, so no visibility widening was
needed; install_diag's only caller is mod.rs itself, so no re-export
either. The Lua-visible pmacs.diag.* API is byte-for-byte unchanged.
mod.rs: 15202 → 14986 lines. Framing + tranche plan:
docs/lua-bindings-split-framing.md.
Validated: fmt clean; clippy --lib clean under both Lua flavors; full lib
suite 1437 passed / 0 failed under luajit AND lua54 (the tests drive
pmacs.diag.* through the Lua VM — same outcomes, code relocated).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014TXbAwk27agwhrNNrhLi2U
Levi Neuwirth
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