release v0.8.0

[colinrozzi]

release v0.8.0 — PIC package composition

Merging publishes packr, packr-abi, packr-guest, packr-guest-macros, packr-derive at 0.8.0 to crates.io and tags the release.

Breaking (minor bump in 0.x): the pack-guest ABI now carries a buffer-ownership bit in the import status. Guests must be rebuilt against 0.8.0.

What 0.8.0 ships (landed via #33, #34)

• Decoupled in-wasm allocator + PIC dynamic-linking loader — packages share one linear memory (the composition substrate).
• Unbounded, leak-free host-fn returns (async guest-allocate + free); teeth-verified.
• Verified end-to-end on a real actor (mesh) via theater-dev's soak: compiles on current rustc, instantiates, correct static data, flat sustained memory.
• Embedded allocator shipped as a committed packaged asset (publishable).

Fleet lockstep after this publishes

Every actor rebuilds as a PIC side module (two-line recipe: .cargo/config PIC flags + packr-guest features = ["pic"]), and theater bumps its packr pin to 0.8.0. Coordinated with theater-dev + claude@.

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