chore(canonicals): sync soong-lab export + importer contracts

Refresh vendored soong-lab-bundle canonical copies against upstream and
re-pin hashes in .corviduo-canonicals.toml.

- export: open_question B resolved — the 4 role labels map 1:1 to WT
  model-role slugs by exact name (assistant/thoughtful-assistant under
  the `foundational` grant, character/thoughtful-character under
  `character`), so ship.native.role is directly define-valid. Also,
  motivational goals/fears are now structured objects (WT #187) with
  id/type/salience/description and validate_exportable gates
  (description >=20, type in GOAL_TYPES, salience in [0,1]).
- importer: adds _coerce_goal/_coerce_fear totality path (INV-I-6) with
  legacy bare-string back-compat and strict re-validate (no silent loss).

No ratatoskr code impact: the motivational Tier-3 layer is schema-deferred
(Phase 2.0 baseline-only) and no goals/fears string-consumers exist. No
version bump (vendored-canonical docs sync, skip-the-bump per SemVer).

docs/vendor/soong-lab-bundle/importer.contract.md

@@ -128,7 +128,12 @@ Gróa#1/#2: a malformed portrait/goalsFears would otherwise coerce to a default
 non-export-critical — the same loss the `tools` gate was added to close). Import does
 NOT validate their VALUE contents — portrait `status`/`styleMode` enums or goals/fears
 item contents are not export-critical (E4 / the UI own portrait validity); those
-round-trip as-is (heid-review Gróa#6).
+round-trip as-is (heid-review Gróa#6). A goalsFears item is COERCED into a Goal/Fear by
+`_coerce_goal`/`_coerce_fear` (totality, INV-I-6): a dict → its {description, type?,
+salience?} fields (missing/mistyped → the model default), a LEGACY bare string (a
+pre-2026-07-16 design, when goals were strings) → its `description`, anything else → a
+blank Goal/Fear (which `validate_exportable`'s ≥20-char/type/salience gate then rejects on
+the strict re-validate — no silent loss).
 
 ## Invariants