iter cma.3: live Qwen3-Coder-Next run + DESIGN.md §Decision-6 empirical addendum + milestone close
Milestone "Cross-model authoring-form test" closed. Live IONOS run against Qwen/Qwen3-Coder-Next executed at temperature=0, max-turns=5, token-budget=500000. Raw dataset under runs/2026-05-12-df7531/: RUN_STATUS=ok, scores.csv with 8 rows (4 tasks × 2 cohorts), summary.md, plus 156 per-turn raw artefacts (request/response/program/ stderr/stdout) preserved for any future analysis. Headline numbers: - AILX cohort: 2/4 green, 1/4 first-attempt, ~95k prompt + ~2.6k completion - JSON cohort: 1/4 green, 0/4 first-attempt, ~192k prompt + ~15k completion - Only first-attempt success was AILX on t3_main_prints (~5 lines of tagged s-expr vs ~23 lines of structured JSON for the JSON cohort's turn-1 attempt that needed correction). - Per spec, single subject + single deterministic run = data point, not verdict. DESIGN.md §"Decision 6: authoring surface" gains an "Empirical addendum (2026-05-12)" subsection: 6-row metric table, illustrative t3 contrast, explicit single-subject scope note pointing at the roadmap follow-up entry for multi-subject expansion. Roadmap: P2 entry "Cross-model authoring-form test" removed (this journal is the convention's one-line mirror); P3 entry "Multi-subject expansion (cross-model authoring-form follow-up)" added with the run dir named as baseline. Milestone artefacts span three iters (cma.1 master mini-spec + renderer; cma.2 harness + tasks + reference solutions; cma.3 this live run + DESIGN.md addendum + close).
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@@ -601,6 +601,40 @@ server, LSP) was deferred — all three layer additively on the
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static-prompt path ships, which remains the
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lowest-common-denominator fallback that always works.
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### Empirical addendum (2026-05-12)
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Cross-model measurement against `Qwen/Qwen3-Coder-Next` (IONOS),
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temperature=0, top_p=1, max-turns=5. Two blind cohorts on the same
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four MVP tasks (`t1_add_three`, `t2_length`, `t3_main_prints`,
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`t4_count_zeros`); each cohort sees only its own form's
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mini-spec. Run directory:
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`experiments/2026-05-12-cross-model-authoring/runs/2026-05-12-df7531/`.
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| metric | JSON cohort | AILX cohort |
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|---|---|---|
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| reached green | 1/4 | 2/4 |
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| first-attempt green | 0/4 | 1/4 |
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| mean turns-to-green (green only) | 2.0 | 2.0 |
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| total prompt tokens | 191,768 | 95,417 |
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| total completion tokens | 15,376 | 2,587 |
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| top error class | check (×4) | parse (×3) |
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The AILX cohort reached green on more tasks at roughly half the
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prompt-token cost and one-sixth the completion-token cost. The
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only first-attempt success in the entire run was AILX on
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`t3_main_prints` (~5 lines of tagged s-expr; the JSON-cohort
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counterpart was ~23 lines of structured JSON and required a
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correction turn). JSON-cohort failures clustered in the
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typecheck-stage; AILX-cohort failures clustered in the parse stage,
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which is the symmetric front-of-pipeline check for that form.
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**Scope of this addendum:** single subject, single deterministic
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run. This is a data point, not a verdict. The universal claim of
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this Decision (".ailx is the AI authoring projection") remains
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pending a multi-subject expansion — see the roadmap entry
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"Multi-subject expansion (cross-model authoring-form follow-up)"
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for the next-step queue.
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## Decision 8: explicit, verified tail calls
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For an LLM author, recursion is the natural iteration form
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