fix(compiler): preserve self slot for final recursive local

[akonwi]

Summary

• load an existing local named-function binding when its declaration is the block result
• avoid rebuilding the closure and downgrading its recursive self capture from CaptureSlot to a nil value snapshot
• cover ordinary function blocks and global initializer blocks with AIR-shape and Go-runtime regressions
• document the final-declaration lowering contract in ADR 0031

Validation

• go test ./... -count=1
• go test -race ./air ./go -count=1
• go vet ./...
• gopls check on changed Go files
• LSP harness: 18/18
• downstreams: Tinear, Decode, SQL, Cooper

Fixes #484

[vercel]

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Project	Deployment	Actions	Updated
ard-lang-dev	Ready	Preview	Sep 7, 2026 7:41pm UTC