Brummel
7d8b3a3c10
Resolves the design fork in Gitea #12 (the bounce-back from the 2026-05-20 /boss session). User accepted both half-decisions: (a) the surface form `(app f)` becomes the canonical nullary call shape, dropping the "expected at least one argument" parser guard in `parse_app_body`; (b) `Term::App.args` mirrors the *actual* serde attrs of `Term::Ctor.args` — `#[serde(default)]` for read-tolerance, no `skip_serializing_if`, so writes always emit `"args":[]`. The plan covers five small tasks: a RED→GREEN E2E (nullary user fn called as `(app greet)`), the four-line parser-guard removal, the one-attribute serde edit, and a doc-honesty fix on `design/contracts/data-model.md` — the current "args omitted when empty" comment on `Term::Ctor` is factually false relative to the code (verified by a serde probe at plan time) and gets rewritten to describe actual write/read behaviour while we are in the same jsonc block. `design/contracts/honesty-rule.md` enforcement folded into the same iter because leaving a stale comment behind in the block we're modifying would be the exact failure mode the rule names. Hash-impact verified at plan time: `grep -rn '"args":\[\]' examples/*.ail.json` returns zero matches, so the new `#[serde(default)]` on `App.args` is read-only behaviour change — write side is unchanged, no existing fixture hash mutates. The plan documents this explicitly under Task 3.2. Two prior fieldtest specs already supplied the LLM-natural shape evidence — `docs/specs/2026-05-15-fieldtest-mut-local.md` F3 (mut-local) and `docs/specs/2026-05-18-fieldtest-loop-recur.md` spec_gap (`run_forever`) — so the feature-acceptance gate in `design/contracts/feature-acceptance.md` is already passed; no brainstorm phase needed for this iter. refs #12