[proggeramlug]

What

scripts/check_file_size.sh fails on main for crates/perry-wpfacts/src/gen_expr.rs: 2011 code lines against the cap of 2000, and the file is not in the allowlist. This PR does what the script asks: a small topical split, not an allowlist entry.

Pure move of one function group, the promise and iteration protocol helpers of impl Gen, into the new sibling module gen_protocol.rs:

• awaited, resolver_fn, async_body, promise_of (await / promise adoption / untransformed async body)
• iterate, iterator_of (for-of and GetIterator)

The six methods stay pub(crate) methods of Gen with unchanged bodies, comments and formatting; callers need no change and nothing is re-exported (they are inherent methods, not free items). lib.rs gains mod gen_protocol;. diff of the removed lines against the added body is empty.

gen_expr.rs: 2011 -> 1932 code lines; gen_protocol.rs: 83.

The group was chosen because it was last edited on 2026-11-09 (three lines) and otherwise in October; the keyed-store / putvalue / IndexSet emission that open lanes are editing is not touched.

Switch: none (no behaviour change).

Checks

• cargo check -p perry-wpfacts --lib --tests after merging main b40d812: clean, no warnings.
• rustfmt --check on the new file: clean.
• perry-wpfacts lib tests and chess facts dump before/after: see the comment below once the qb10 run is in.
• Long gates (IR census, vf, tssrc, Supabase, skin size, full suites): not run.

[coderabbitai]

Caution

Review failed

The pull request is closed.

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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[proggeramlug]

qb10, on main 3cd7ef9 + #14526's branch (which contains this PR): cargo test --release -p perry-wpfacts --lib -- async await promise iterat for_of generator 123 passed, 0 failed. Facts dump before/after: pure move, not rebuilt before the move.