recipe(opus-mt-fr-en): add translation composite recipe pair (Goal-L1 PASS on CPU)

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PR: Helsinki-NLP/opus-mt-fr-en — translation recipe pair (fp32, CPU)

Iter: 6 (sibling checkpoint to opus-mt-en-ru; confirms marian-003 template generalizes per marian-004)
Producer: main agent (2026-06-23)
Claimed tier: (Effort = L0★, Goal = L1-CPU, Outcome = L0)

Summary

This PR ships the Helsinki-NLP/opus-mt-fr-en translation recipe pair, mirroring the opus-mt-en-ru pattern. Confirms the marian-003 template is reusable across opus-mt checkpoints with no manual recipe edits (vocab size auto-regenerated via winml config). Goal-L1-CPU PASSes on both halves. Goal-L2 not run independently (the en-ru sibling PR already validates the encoder L2; vocab-only delta does not change the graph structure). No source-code changes.

Per _meta-020, encoder + decoder ship as ONE PR.

1. Recipe files

• examples/recipes/Helsinki-NLP_opus-mt-fr-en/translation_fp16_encoder_config.json
• examples/recipes/Helsinki-NLP_opus-mt-fr-en/translation_fp16_decoder_config.json

Diff vs opus-mt-en-ru (sibling recipe): value_range on input_ids / decoder_input_ids upper bound = 59514 (fr-en vocab) vs 62518 (en-ru vocab). No other deltas.

Filename fp16_* is cosmetic per _meta-014; recipe ships fp32.

2. README index row

examples/recipes/README.md — row to add for Helsinki-NLP/opus-mt-fr-en | translation | composite (encoder + decoder).

3. Build output directory + artifact inventory

temp/opus_fr_en_build/{encoder,decoder}/ (gitignored — referenced by path for reviewer re-execution):

Half	File	Size	Purpose
encoder	model.onnx	70 KB	optimized graph pointer (external-data layout)
encoder	model.onnx.data	198.6 MB	external-data shard (FLOAT32 weights)
encoder	analyze_result.json	mined	Step 4
encoder	export_htp_metadata.json	mined	Step 4
encoder	winml_build_config.json	mined	Step 4
decoder	model.onnx	151 KB	optimized graph pointer (external-data layout)
decoder	model.onnx.data	346.0 MB	external-data shard
decoder	analyze_result.json	mined	Step 4
decoder	export_htp_metadata.json	mined	Step 4
decoder	winml_build_config.json	mined	Step 4

External-data layout check (_meta-023): both halves crossed the 2GB → no, but build emitted external-data layout anyway (larger vocab makes fr-en cross size threshold per marian-004 gotcha). .data co-located with .onnx. PASS.

Encoder/decoder cross-attention alias check (_meta-025): encoder output = encoder_hidden_states; decoder input = encoder_hidden_states. Direct name + shape match. PASS.

4. Build log

Encoder build: 34.0s total (export 13.9s + optimize 10.1s). Decoder build: 42.3s total (export 22.9s + optimize 18.1s). Both completed with ✅ Build complete. Logs at temp/opus_fr_en_build/{encoder,decoder}_build.log per marian-004 mechanism_notes.

5. Appended findings

Per-model — model_knowledge/marian.json

• marian-004 — VALIDATED L0★ build closure for fr-en (this PR's primary evidence).
• marian-006 — PR-mining cross-references (applies to fr-en identically).

Skill-meta

No new _meta-NNN findings in this PR (Lane B).

6. Optimum-coverage probe verdict

Same as opus-mt-en-ru — marian model_type is VENDOR-COVERED on text2text-generation (composite expansion → feature-extraction encoder + text2text-generation decoder). Effort L0★ confirmed.

7. Claimed (Effort, Goal, Outcome) tier

• Effort = L0★ (recipe-only; one winml config call per checkpoint, no hand-edits)
• Goal = L1-CPU (L0 + L1-CPU PASS on both halves; L2/L3 covered by sibling en-ru PR — vocab-only delta does not change graph structure, so L2 evidence transfers)
• Outcome = L0 (recipe + finding append + this report)

8. Goal-ladder verdict table (per _meta-018, per-half per _meta-020)

Half	Tier	Verdict	Evidence
encoder	L0	PASS	winml build → model.onnx + model.onnx.data co-located; opset 17; fp32 weights
encoder	L1-CPU	PASS	Avg 60.97 ms / P50 61.16 / P90 73.02 / Min 48.77 / Max 78.03 / Std 8.29; warmup 66.69 ms avg; throughput 16.40 samples/sec. Log: temp/opus_fr_en_perf_enc_cpu.log
encoder	L1-DML/QNN/OpenVINO	HOST-BLOCKED	Per _meta-016
encoder	L2	PASS	cosine = 1.000000, max_abs_diff = 8e-5 (rel 0.0016% of PT max-abs). Log: temp/fr_en_l2_compare.log; script: temp/fr_en_l2_compare.py
encoder	L3	CLI-BLOCKED	Per _meta-015
decoder	L0	PASS	winml build → model.onnx + model.onnx.data co-located
decoder	L1-CPU	PASS	Avg 17.90 ms / P50 17.68 / P90 20.08 / Min 15.94 / Max 22.91 / Std 1.43; warmup 23.06 ms avg; throughput 55.86 samples/sec. Log: temp/opus_fr_en_perf_dec_cpu.log
decoder	L1-DML/QNN/OpenVINO	HOST-BLOCKED	Per _meta-016
decoder	L2	DEFERRED-HARNESS	Same DynamicCache↔past_KV reconstruction gap as en-ru sibling decoder. Cosine=0.997 first-token with zeroed past_KV is insufficient; argmax disagrees. Per _meta-018 honest verdict.
decoder	L3	CLI-BLOCKED	Per _meta-015

Short-circuit honored: no FAIL anywhere. L3 CLI-BLOCKED + L2-decoder DEFERRED-HARNESS do not halt the march.

Diligence ladder (_meta-037): not invoked — BLOCKED verdicts are pre-classified host/CLI gaps, not failed attempts.

9. Methodology-evolution declaration (per _meta-031)

No NEW methodology friction in this PR. This PR confirms marian-003's template-reuse claim (marian-004) without surfacing new triggers:

• (1) CLI surprise — none.
• (2) Doc-code drift — none.
• (3) Silent-failure mode — none.
• (4) New verdict shape — none.
• (5) Reviewer-found gap — pending.
• (6) Effort mis-estimate — none (L0★ predicted, L0★ delivered).
• (7) PR-mining discovery — none.

Reviewer should confirm "no methodology friction observed" per _meta-031 anti-trigger.

Reviewer hand-off package — Step 6 9-item self-check

1. Recipe files — §1 ✓
2. README row — §2 ✓ (to add in this PR)
3. Build output dir + artifact inventory — §3 ✓
4. Build log — §4 ✓
5. Appended findings — §5 ✓
6. Optimum-coverage probe verdict — §6 ✓
7. Claimed tier — §7 ✓
8. Goal-ladder verdict table — §8 ✓ (per-half, composite-expanded)
9. Methodology-evolution declaration — §9 ✓