HermitCrab conformance: 26 fixtures flagged fieldworks_producible still use a slot-rule outputPartOfSpeech FieldWorks never writes #612

18 of 127 conformance fixtures and 8 of 16 stress fixtures are flagged fieldworks_producible: true but give a slot rule an outputPartOfSpeech, which FieldWorks never writes. The flag overclaims. A reader cannot yet trust it to mean that a real project can produce the grammar.

Status: open. The first retirement pass only acted on fixtures flagged false; it is on #480, and the stress half is on #578.

What we know, at e9569ec:

• Identity outputPartOfSpeech on a slot rule: 18 conformance fixtures. Dropping it changed no parse in the fixtures already converted.
• edge-cases/morphotactic-attribute-breadth also has a partial="true" entry with a part of speech, a partial rule in a slot, and a partial rule with outputPartOfSpeech.
• 52 conformance fixtures have a linear stratum: 5 explicit and 47 by the DTD default of linear.
• HCLoader builds its Morphology and Clitics strata as Unordered. Surface sets no order, so a linear Surface stratum with no rules may be legitimate.

Not known: how many of the 52 have morphological rules in a linear stratum, and whether flipping them to unordered changes any parse.

Proposed change: a one-line drop in each slot-rule fixture, one rebuild of morphotactic-attribute-breadth, and a per-stratum count for linear, then convert or delete. Expected parses come from the engine. A check that fails on these patterns when a fixture is flagged true would stop them coming back.

Related: #480 (open), #578 (open), #552 (open).

Next: count the linear strata that hold morphological rules, then convert the fixtures.

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