iter embedding-abi-m1.1 (PARTIAL 3/7): schema + surface + baseline prerequisites; plan Repair

Tasks 1-3 of docs/plans/embedding-abi-m1.1.md, a verified known-good
subset (cargo build --workspace exit 0; full workspace green; the
roundtrip_cli all-examples gate green):

- Task 1: CLI build-path MissingEntryMain baseline pin
  (examples/embed_noentry_baseline.ail + embed_missing_main_baseline.rs;
  triple-assertion, layered on the green codegen-unit pin lib.rs:3314).
- Task 2: additive FnDef.export: Option<String> (serde default +
  skip_serializing_if, modelled on FnDef.doc); compile-driven thread
  of export: None across ~85 FnDef/AstFnDef literals / 18 files incl.
  all in-source #[cfg(test)] mod tests + drift/hash/spec-drift
  literals + the codegen lib.rs:3320 in-source pin; hash-stability
  golden pin; DESIGN.md fn-JSON "export" line. DONE_WITH_CONCERNS
  (plan symbol content_hash_fn -> def_hash per hash_pin.rs, plan-
  pseudo-vs-reality class, plan corrected).
- Task 3: Form-A (export "<sym>") modifier — parse_export +
  parse_fn thread + write_fn_def emission + form_a.md grammar;
  byte-identical round-trip.

Task 4 BLOCKED (Boss plan-defect: fixtures declared module != file
stem; AILang's loader hard-enforces module==stem at workspace.rs:438,
so ail check panicked on load before the gate). Boss resolution
(Option 2, overriding the orchestrator's Option 1, rationale in the
journal + plan Design-decision 6): keep descriptive embed_* filenames,
rename fixture MODULES to their stems — the C symbol backtest_step
stays via (export ...), demonstrating spec Decision 2's mangling-
decoupling rather than violating it; archive becomes
libembed_backtest_step.a, internal symbol @ail_embed_backtest_step_step,
host.c unchanged. Plan fixed (Design-decision 6 + Task-4 module==stem
+ Task-5/6/7 dependent strings + the no-*. Float-head + content_hash_fn
concerns folded). Headline fixture corrected; blocked-Task-4 WIP
discarded (recreated by the [4,7] re-dispatch from the fixed plan).

PARTIAL commit (not the iter's final commit): the implement Repair
path mandates committing the known-good subset so the [4,7]
re-dispatch starts from a clean tree that includes Tasks 1-3 (Tasks
4-7 structurally depend on the schema field + surface). INDEX line
added when the full iter lands post-re-dispatch.

crates/ailang-check/src/lib.rs

@@ -1754,6 +1754,7 @@ fn check_instance(
             body: subst_body,
             doc: None,
             suppress: Vec::new(),
+        export: None,
         };
         check_fn(&synthetic, env, out_warnings)?;
     }
@@ -4260,6 +4261,7 @@ mod tests {
             body,
             suppress: vec![],
             doc: None,
+        export: None,
         })
     }
 
@@ -4828,6 +4830,7 @@ mod tests {
             },
             suppress: vec![],
             doc: None,
+        export: None,
         });
         // Use unbox at Int and at Bool — both must succeed and not
         // cross-contaminate the polymorphic variable.
@@ -6933,6 +6936,7 @@ mod tests {
                 body: Term::Lit { lit: Literal::Str { value: "_".into() } },
                 doc: None,
                 suppress: vec![],
+            export: None,
             })],
         };
         let mut modules = BTreeMap::new();

crates/ailang-check/src/lift.rs

@@ -658,6 +658,7 @@ impl<'a> Lifter<'a> {
                     body: body_full,
                     suppress: vec![],
                     doc: Some(doc),
+                export: None,
                 }));
 
                 // Update env globals so any outer LetRec lifted later

crates/ailang-check/src/linearity.rs

@@ -1106,6 +1106,7 @@ mod tests {
             body,
             suppress: vec![],
             doc: None,
+        export: None,
         })
     }
 
@@ -1259,6 +1260,7 @@ mod tests {
             body: Term::Lit { lit: Literal::Int { value: 0 } },
             suppress: vec![],
             doc: None,
+        export: None,
         });
         let f_body = Term::App {
             callee: Box::new(Term::Var { name: "read".into() }),
@@ -1425,6 +1427,7 @@ mod tests {
             body,
             suppress: vec![],
             doc: None,
+        export: None,
         })
     }
 
@@ -1574,6 +1577,7 @@ mod tests {
             },
             suppress: vec![],
             doc: None,
+        export: None,
         });
 
         let m = Module {

crates/ailang-check/src/mono.rs

@@ -305,6 +305,7 @@ fn const_as_pseudo_fn(c: &ConstDef) -> AstFnDef {
         body: c.value.clone(),
         doc: None,
         suppress: Vec::new(),
+    export: None,
     }
 }
 
@@ -944,6 +945,7 @@ pub fn synthesise_mono_fn(
         body,
         doc: None,
         suppress: Vec::new(),
+    export: None,
     })
 }
 
@@ -1043,6 +1045,7 @@ pub fn synthesise_mono_fn_for_free_fn(
         body: new_body,
         doc: source_fn.doc.clone(),
         suppress: Vec::new(),
+    export: None,
     })
 }
 

crates/ailang-check/src/reuse_shape.rs

@@ -597,6 +597,7 @@ mod tests {
             body,
             suppress: vec![],
             doc: None,
+        export: None,
         })
     }
 

crates/ailang-check/src/suppress_filter.rs

@@ -126,6 +126,7 @@ mod tests {
                 body: Term::Lit { lit: Literal::Int { value: 0 } },
                 doc: None,
                 suppress,
+            export: None,
             })],
         }
     }

crates/ailang-check/src/uniqueness.rs

@@ -445,6 +445,7 @@ mod tests {
             body,
             suppress: vec![],
             doc: None,
+        export: None,
         })
     }