P1-05: add bounded generic and trait foundation - #1
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P1-05 needs reusable generic substitution, trait evidence and closed-instance planning before generic source bodies can enter the compiler pipeline. This PR adds opt-in structural substitution/matching, conservative implementation coherence with an occurs check, recursive bound resolution, and deterministic reachable-instance planning. All phases share depth, work, item, time and cancellation limits; failed operations expose no partial proof or plan.
The new library contracts are documented in
docs/generic-profile.md. P1-05 remains 🚧 In progress: source/HIR generic binding, body specialization and AOT-reachable emission are subsequent PRs. The paired roadmaps record the execution order, with the typed MIR foundation next.A separate prerequisite commit corrects four AST root extents to match the committed LF source fixtures, fixing fresh-checkout snapshot failures without weakening assertions.
Validation: ✅ Release solution build with warnings treated as errors; ✅ 282/282 executable regression tests, including 17 generic foundation groups; ✅ 49/49 syntax corpus cases; ✅ bilingual roadmap checks and
git diff --check. Local validation used installed .NET SDK 10.0.401; the repository's 10.0.400 SDK pin remains unchanged.