Integrate DEL project, embedded Workshop, settings, strings, and backend compiler surfaces

[Teakowa]

Parent: #8

Goal

Complete the Workshop-dependent DEL/OSTW project/compiler surfaces around core/runtime lowering while routing canonical Workshop concerns through released workshop-rs contracts and explicitly classifying presentation-only upstream options that WrightKit does not need to reproduce.

Context

The DEL compatibility inventory includes embedded vanilla Workshop, lobby/settings imports, chase/modify helpers, multiple string forms, Workshop comments, and output-format options. These surfaces cross the source-language/canonical-Workshop ownership boundary differently and should not be hidden inside runtime lowering.

The previously known rule-event gap is resolved in workshop-rs. Canonical Workshop setting identities, types/domains, applicability, localization, validation, and emission remain owned by workshop-rs; DEL/OSTW-specific project/config carriers remain owned here.

Ownership review closed workshop-rs#33 as not planned: upstream OSTW explicitly treats customGameSettings.json as a legacy imported-file format, not a canonical Workshop interchange format. .lobby, legacy customGameSettings.json, and their project/import semantics therefore belong to deltin-rs. They should lower into the released typed workshop_rs::settings API rather than move their parsers into the canonical Workshop core.

Scope

• Integrate vanilla Workshop superset blocks and links through canonical workshop-rs parsing/WIR contracts where source evidence requires mixed DEL + raw Workshop behavior.
• Lower/link DEL variable and subroutine references to embedded Workshop constructs without creating a second raw Workshop semantic model.
• Parse evidence-backed DEL/OSTW lobby/settings carriers, including .lobby and legacy customGameSettings.json, according to DEL/OSTW compatibility requirements, then convert them into the canonical released workshop_rs::settings typed/source-preserving contract.
• Keep carrier path/merge/import compatibility behavior local to DEL/OSTW; use canonical workshop-rs identities, value types/domains, applicability, validation, localization, and emission after conversion.
• Complete chase/stop/modify variable lowering using canonical Workshop action/value/enum identities and existing DEL target-player resolution.
• Implement custom/interpolated/classic string lowering where the canonical WIR/emitter contract represents the required observable behavior.
• Investigate localized-string requirements against the released canonical WIR/catalog; if the required semantic distinction is missing, create a focused owning workshop-rs issue instead of a local workaround.
• Integrate DEL action comments with the released workshop-rs comment/source-preservation contract from workshop-rs#32; do not invent a DEL-local Workshop comment representation.
• Review upstream output-format options such as c-style Workshop output and tabs against WrightKit's compatibility contract. Implement only behavior required by a declared observable/source contract; otherwise classify it explicitly rather than chasing formatter identity.
• Preserve provenance for embedded Workshop/settings diagnostics back to authored DEL/project source where practical.
• Add focused project-level and minimized fixtures for each supported surface.

Non-goals

• Duplicating Workshop parser, typed settings catalog, localization data, validation, emitter, or formatting engine.
• Moving DEL/OSTW .lobby or legacy JSON carrier parsing into workshop-rs.
• Treating upstream presentation formatting as semantic compatibility by default.
• Implementing speculative compiler utilities without inventory/corpus evidence.
• Workshop -> DEL decompilation.

Acceptance criteria

• Supported mixed DEL/Workshop projects use canonical workshop-rs semantics for embedded raw Workshop rather than a provider-local copy.
• Supported .lobby / legacy JSON settings imports are parsed as DEL/OSTW carriers in this repository, converted through the public workshop-rs typed settings contract, and emitted through canonical Workshop validation/localization/emission without a second settings semantic model.
• Wrong or unsupported carrier values are diagnosed at the appropriate boundary; canonical Workshop setting type/applicability failures come from the owner contract rather than duplicated local tables.
• Chase/modify cases lower with canonical identities and preserve player/global target semantics.
• String variants have explicit supported/unsupported states backed by tests and canonical contracts; missing canonical capabilities are tracked in workshop-rs, not hidden locally.
• Comment preservation has an explicit evidence-backed contract and implementation/gap classification.
• Presentation-only output options are not mistaken for semantic correctness requirements.
• Relevant support-matrix entries advance only where end-to-end evidence exists.

Dependencies

• Establish the workshop-rs dependency and canonical catalog provider #29 — released canonical provider/dependency seam.
• Lower core DEL HIR into canonical workshop-rs WIR #30 — core WIR lowering.
• Implement DEL object, reference, dispatch, recursion, and closure runtime lowering #31 where project cases depend on advanced runtime lowering.
• workshop-rs#108/#109/#110/#111 — typed Workshop settings owner track; consume the released contract when available.
• workshop-rs#32 — canonical Workshop comment/source-preservation contract.

Any new source-language-neutral Workshop semantic gap discovered during implementation must still be fixed in the owning workshop-rs repository rather than represented locally.

[Teakowa]

Project surface audit: old PR #42 was superseded and closed. Replacement #58 is rebuilt from current main and retains only root ds.toml discovery/entry_point selection integrated with the existing ProjectOptions/ProjectConfig API. Explicit entry/config precedence, malformed PJ004 provenance, and source ordering are verified. project.ds-toml advances to source-supported; embedded Workshop/settings/chase/string/compiler-format gaps remain out of scope and canonical ownership remains in workshop-rs.