docs: spec PIC package composition + correct composition status#37
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Adds docs/pic-composition.md — the design spec for porting CompositionBuilder onto the 0.8.x PIC shared-memory loader (N packages share one memory, cross-calls pass pointers directly instead of copying between memories), with a two-package adder+doubler example and the path to static merge into one .wasm. Also corrects the README: the shipped composition is RUNTIME composition (separate memories, cross-memory bridge), not a merged module; adds the level-1/2/3 roadmap. package-linking-exploration.md gets a pointer to the new spec. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Spec: PIC package composition + accurate composition status
Requested spec for the next step of package-to-package composition, plus a docs correction.
docs/pic-composition.md(new) — design spec for portingCompositionBuilderonto the 0.8.x PIC loader. The current builder gives each package its own memory and copies bytes between them on every cross-call; the PIC version lets N packages share one memory (one allocator, disjoint bases) and wires A's import directly to B's export — no cross-memory copy. Includes the two-packageadder+doublerexample to build first, honest open questions (return-buffer free, memory floor scaling), and the path to level-3 static merge into one.wasm.package-linking-exploration.md— pointer to the new spec.Docs only — no code. For review before merge.
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