chore(src): delete 27 dark src files whose code a compiled file holds (#4700 batch 1)

[noahgift]

Batch 1 of #4700: delete 27 .rs files under crates/*/src that no build compiles, each a copy of code a compiled file already holds. This re-cuts f3a0a48 onto current main with the same deletions; 40,766 lines go.

Row	Change
1	Delete 25 dark files in aprender-serve, for example token.rs, qa_phase.rs, both mock_model.rs and layers/multi_head_attention.rs
2	Delete the dark generated_contracts.rs copies in aprender-graph and aprender-test; the compiled copy in aprender-serve stays
3	Remove the 13 baseline rows that named a deleted file (src_test_files_unwired 10, complexity 2, claim_literal 1). No row is added and no row for a surviving file changes

Why this is safe:

• No mod declaration names any of the 27 files.
• No include! or #[path] on main resolves to any of them. I checked 1,798 include! targets and 857 path targets, each resolved relative to its own file.
• On main 812dbe3 plus this commit, all of these exit 0:
  • cargo check -p aprender-serve --all-targets, with and without --features cuda
  • cargo check -p aprender-graph --all-targets
  • check_src_test_files_wired.sh
  • check_baseline_ratchets.sh

Refs #4700
keep-open: batch 1 of several; #4700 also covers the stale-file decisions (S6, decode event, fused QKV, contract checks, argmax, ALiBi doc) and widening the dark-file guard to the whole tree.

ont-delta: none this sweep deletes uncompiled files, and the known-red rows it drops name only those deleted files; no type, shape or reason changes.

🤖 Generated with Claude Code

[github-actions]

§13.11 rung 1 — quorum shadow verdict

S13-SHADOW pr=5163 head=1d9fd52e6fc6c458d771478adc9c180fd707bf2e verdict=REFUSE class=Q1 arm_rc=1

Shadow mode: this records a verdict and merges nothing. A refusal
to arm is not a block (§13 adds zero rows to §7) — the pull request is
exactly as green as it was.

[noahgift]

seat 1, la-0.72 APPROVE @ 1d9fd52

Checked each of the 27 deleted files: none has a mod, include! or path declaration in its parent module, cfg-gated ones included. The three baseline files lose only the rows of the deleted files. CI green.

Receipt: review-la-0.72-5163-1d9fd52e6f.md

[noahgift]

seat 2, aprender-78 APPROVE @ 1d9fd52

• All 27 deleted .rs files are dark at this head. For each one, no include!/include_str!, #[path] or parent-module mod resolves to its exact path, checked by path resolution. A loose suffix grep flagged 10, and every one resolved to a different file (e.g. gguf/loader.rs includes gguf/token.rs, not src/token.rs).
• The three baseline files lose only the rows for the deleted files; no other row is loosened. The one remaining non-Rust mention is a historical evidence log.
• CI on this head: 10 success, 2 skipped.