perf(build): accelerate AIR lowering and reuse Go cache

[akonwi]

Summary

• cache cross-module required, inherent, and trait method lookups by canonical struct identity
• canonically order AIR discovery and generated Go module metadata so unchanged builds produce byte-stable workspaces
• restart generated temporary names per function and global initializer so unrelated declaration ordering does not rewrite output
• keep method caches scoped to single-root lowering to avoid mixing independent module graphs

Performance

Warm local builds:

Project	Before	After
Tinear	~10.25s	~3.12s
Cooper dashboard (determinism pass)	~2.27s	~0.99s

For Tinear, AIR lowering dropped from ~6.18s to ~2.05s. Once generated output became stable, the Go stage dropped from ~3.05s to ~0.35s.

Two identical Tinear builds changed 0/79 generated Go files and no generated workspace files, compared with 62/79 changed Go files before canonicalization.

Validation

• go test ./... -count=1
• go test -race ./... -count=1
• gopls check on changed Go files
• git diff --check
• Tinear and Cooper warm-build profiling

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Project	Deployment	Actions	Updated
ard-lang-dev	Ready	Preview	Sep 1, 2026 1:19pm UTC