fix(go): preserve references in interface conversions

[akonwi]

Context

• Mutable references were dereferenced when passed to Ard Any, Go any, or named empty Go interfaces, so APIs such as json.Unmarshal received a value snapshot instead of caller-owned storage.
• Fixes Generic mut parameter is dereferenced when passed to Go any #344.

What's changed

• Generalize checker and AIR interface-conversion metadata across Any and named Go interfaces.
• Preserve existing mutable-reference identity at runtime interface destinations while retaining value snapshots for ordinary Go generic T parameters.
• Preserve ownership through nullable interface conversion and Maybe<mut T> inference, specialization, and extraction.
• Add checker, AIR, and runtime regressions covering calls, fields, assignments, returns, Maybe, json.Unmarshal, named empty interfaces, and generic countercases.
• Accept ADR 0056, amend superseded ADR 0039/0045 rules, and update Go interop documentation.

Validation

• cd compiler && go test ./... -count=1
• cd website && npm run build
• Downstream checks/builds and 171 tests across Dram, Decode, SQL, Migrate, Maestro, and Tinear
• git diff --check
• Final code review: no material findings

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Project	Deployment	Actions	Updated (UTC)
ard-lang-dev	Ready	Preview, Comment	Jul 27, 2026 10:45am