fieldtest-form-a: 4 fixtures + spec report; agent doctrine update

Boss-dispatched fieldtest at milestone close. Agent authored 4 .ail
fixtures (factorial smoke + Show user-ADT + user-class Describe with
two instances + two-module workspace) from DESIGN.md + form_a.md only
(no compiler-source reads, no spec-of-milestone reads). All four
fixtures `ail check` ok and `ail run` produces expected stdout.

Findings (1 bug, 1 friction, 2 spec_gaps, 3 working):

- [bug] instance-method-body unbound-var bypasses `ail check` —
  forma_3 first attempt called `str_concat` inside the instance
  method body; `ail check` returned ok, `ail build` died with the
  monomorphise_workspace "unknown identifier" diagnostic. Same
  shape at fn-body level correctly fires `[unbound-var]` at check
  time. Next: debug skill, RED-first against `ail check`.

- [friction] no `str_concat` primitive. Every realistic Show MyType
  body wants string concatenation; the absence forced the agent to
  shape examples around bare int_to_str / ctor-arity-1 patterns.
  Next: small planner tidy iter wiring `str_concat` symmetric to
  `str_clone` and `int_to_str`.

- [spec_gap] form_a.md has zero references to class, instance,
  constraint, or method productions — pre-22 surface only. The
  form-a-default-authoring milestone made .ail the authoring form,
  but the form_a spec doc remains pre-typeclass.

- [spec_gap] form_a.md leaves the class-qualifier ambiguity in
  `(instance (class X))` unspecified — bare-class-name vs canonical-
  form rule from mq.1 is not documented at the surface level. The
  agent picked the bare-name reading from the corpus; the canonical-
  form reading is equally plausible from the schema.

Boss-side cleanup at commit time:
- Deleted 8 stale .ail.json sidecars in examples/fieldtest/ (4
  forma_* derived by the fieldtester per old dual-form workflow + 4
  pre-existing floats_* from the prior fieldtest milestone that
  iter form-a.1 T8 missed because the bash deletion loop globbed
  only examples/*.ail.json direct children).
- Updated skills/fieldtest/agents/ailang-fieldtester.md to remove
  the now-obsolete "generate canonical JSON sidecar" step (Phase 3
  rewritten + Iron Law + Reading list + Common Rationalisations +
  Red Flags all aligned to the post-form-a single-form doctrine).

cargo test --workspace: 557 passed, 0 failed, 3 ignored (unchanged
from audit-form-a — the fieldtest fixtures are standalone, not
referenced by any test).

Findings deferred to follow-up iters; the milestone close itself is
still clean.

docs/journals/INDEX.md

@@ -54,3 +54,4 @@
 - 2026-05-13 — iter form-a.0: prelude pilot for Form-A-as-default-authoring milestone — examples/prelude.ail rendered (116 lines / 6386 bytes) via `ail render`; two auto-discovering roundtrip tests (every_ail_fixture_matches_its_json_counterpart + parse_then_print_then_parse_is_idempotent_on_every_ail_fixture) green on the new fixture without test-code changes; prelude.ail.json retained per spec §A2 (singular dual-form iter, deletion lands iter 1 with bulk test-infra refactor); cargo test --workspace green at 558 tests → 2026-05-13-iter-form-a.0.md
 - 2026-05-13 — iter form-a.1: Form-A-as-default-authoring milestone close (Boss-decided strategy C, big-bang) — 12 tasks across two implementer dispatches; T1 added 3 new tests (parse-determinism + CLI-pipeline-idempotency + carve_out_inventory#[ignore]) + T2 bulk-rendered 99 missing examples/<stem>.ail (corpus 58→157 .ail) + T3-4 migrated 26 fixture-loading test files (Group A load_workspace→ailang_surface::load_workspace + Group B subprocess suffix flip) + T5 relocated 23 #[cfg(test)] mod tests blocks from ailang-core/-codegen production source to integration test crates with ailang-surface dev-dep (hash_pin.rs + workspace_pin.rs + eq_primitives_pin.rs + prose snapshot migration) + T6 bench-driver suffix flips (4 Python + run.sh, both compile_check.py + cross_lang.py exit 0) + T7 re-authored 4 raw-JSON-inspect e2e tests via `ail parse`-derived tempfiles + retired 1 (render_parse_round_trip_canonical subsumed by T1) + T8 deleted 156 non-carve-out .ail.json (inventory 8 carve-outs + 157 .ail post-T8, alphabetical: broken_unbound + prelude + 3× test_22b2_* + 3× test_ct1_*) + 20 forward-pulled stale-.ail.json-ref repairs missed by T1-5 recon + T9 retired 3 obsolete roundtrip tests (print_then_parse_round_trips_every_fixture + every_ail_fixture_matches_its_json_counterpart + cli_render_then_parse_preserves_canonical_bytes_on_every_fixture) + dead helpers (list_json_fixtures ×2, round_trip_one, strip_trailing_newlines) + flipped schema_coverage corpus to .ail (forward-pulled into T8 for green-gate) + T10 §C3 DESIGN.md §Roundtrip Invariant restated with parse-determinism + idempotency + CLI-pipeline-idempotency + carve-out-anchor framing (5 surviving enforcement tests named) + T11 §A4 CLAUDE.md + DESIGN.md doctrine sentences replaced (canonical form is JSON-AST; authoring form is .ail) + T12 WhatsNew milestone-close entry + roadmap [milestone] form-a struck [x] (Closed 2026-05-13 by iter form-a.1). 4 carve-outs added beyond the original 7 §C4(a): only 1 — prelude.ail.json — landed as §C4(b) compile-time-embed (rationale: include_str! at workspace.rs:417 + main.rs:474; resolution queued as separate milestone Prelude embed: Form-A as compile-time source). Spec amendment + grounding-recheck PASS at 9fcda8b. Final tests: 557 green + 3 ignored (561 from T1 − 4 retired = 557); bench compile_check.py + cross_lang.py exit 0; check.py noise envelope continues 11th consecutive audit, baseline pristine. Milestone structurally closed → 2026-05-13-iter-form-a.1.md
 - 2026-05-13 — audit-form-a: milestone close (Form-A as the default authoring surface) — architect status drift_found with 4 documentary-only items (2× [medium] spec + plan "seven carve-outs" orphans contradicting the §C4(b) amendment commit 9fcda8b — the implementation is eight-carve-out-correct; 2× [low] hash.rs:57 empty `mod tests {}` placeholder after T5 relocation + round_trip.rs:16 stale "Direction 2" docstring contradicting T10's framing rewrite); architect explicit recommendation carry-on — no form-a.tidy queued, drift deferred to documentary cleanup at next opportunity (architect verbatim: "the implementation is correct and the spec orphans are post-hoc retro-clean-up, not active drift"). Bench: all 3 scripts exit 0, baseline pristine for the 12th consecutive audit. check.py 2 regressions in tail-latency max_us (latency.explicit_at_rc + latency.implicit_at_rc, both >120% over baseline, both paired with p99 improvements on same metric stem) — 12th consecutive observation of the metric-identity-migrating noise envelope since audit-cma; compile_check.py 2 regressions in sub-millisecond check_ms on hello + borrow_own_demo — timing-jitter on the corpus's two smallest fixtures, iter form-a.1 T6 already flagged the same pair as transient; cross_lang.py 25/25 stable, bench_tree_walk.rc_over_c improved 2.74→2.59 still inside noise. What holds (verified): §C3 §Roundtrip Invariant restated with 4 properties + 5 surviving enforcement tests named verbatim; §A4 CLAUDE.md + DESIGN.md doctrine reworded per spec; 8-carve-out inventory matches spec post-amendment (alphabetical: broken_unbound + prelude + 3× test_22b2_* + 3× test_ct1_*); 156 non-carve-out .ail.json deleted; 157 .ail post-iter; cargo test --workspace 557 green + 3 ignored; WhatsNew editorial-clean (user-facing); roadmap milestone struck [x] with close attribution + follow-up [Prelude embed] milestone present with motivation + 3 resolution options. Milestone fully closed → 2026-05-13-audit-form-a.md
+- 2026-05-13 — fieldtest-form-a: 4 hand-authored `.ail` fixtures (factorial smoke, Show user-ADT, user-class Describe with two instances, two-module workspace) + spec report. Findings: 1 bug (instance-method-body unbound-var bypasses `ail check`; surfaces at mono with degraded "monomorphise_workspace: unknown identifier" diagnostic — `ail check` should fire `[unbound-var]` like at fn-body level → debug RED-first), 1 friction (`str_concat` primitive missing — first attempt at user-Show body wanted "prefix=" ++ int_to_str-style concatenation, repaired by dropping prefix → planner tidy symmetric to `str_clone`/`int_to_str` wiring), 2 spec_gaps (`form_a.md` has zero `class`/`instance`/`constraint`/`method` sections — the form-a milestone made `.ail` the authoring form but the form_a spec doc still only covers pre-22 surface; canonical-form rule for `(instance (class X))` class-qualifier not in form_a — `class X` vs `class some_module.X` reading is ambiguous from the spec, observed canonical reading via examples corpus). Plus 3 working (4 fixtures, 3 first-shot-clean + 1 first-attempt-bug-then-clean). Boss-side cleanup at commit time: deleted 8 stale `.ail.json` sidecars in `examples/fieldtest/` (4 forma_* derived by fieldtester per old workflow, 4 pre-existing floats_* from prior milestone that T8 missed because the bash deletion loop globbed only `examples/*.ail.json` direct children); plus updated `skills/fieldtest/agents/ailang-fieldtester.md` Phase 3 to remove the now-obsolete "generate canonical JSON" step (the agent was calibrated to dual-form pre-form-a; post-form-a `.ail` is the sole authoring form). Findings deferred to follow-up iters: bug → next `debug` dispatch, friction → small planner tidy, spec_gaps → form_a.md tightening pass → 2026-05-13-fieldtest-form-a.md