fix(native): restore interactive shell correctness

[NathanFlurry]

Summary

• extract the native kernel, sidecar, PTY, Rust client, and actor shell fixes found while building feat(browser): complete interactive shell demos #1745
• restore inherited terminal state, ordered output, live resize, executable shebangs, and Node-compatible V8 behavior
• fix Brush child PID reporting, the Vim WASI cross-build, clean registry dependency bootstrapping, and Pi's direct dependency
• remove all 113 committed coreutils WASM artifacts and document the source-only versus strict runtime build contract

Validation

• clean just registry-native build with all 113 coreutils manifest entries present
• source-only placeholder build and strict build:runtime .aospkg assembly
• native-sidecar POSIX/shebang suite: 3 passed
• real Brush interactive PTY suite: 3 passed
• targeted Rust checks, kernel PTY, client shell, actor contract, and V8 PTY line-discipline tests
• pnpm check-types (147/147 tasks), cargo fmt --check, Biome checks, and fixed-version verification

The full actor contract suite still contains an unrelated baseline VirtualStat fixture mismatch in unchanged files; actor unit tests and the event contract covering this shell transport pass.

[railway-app]

🚅 Deployed to the agentos-pr-1746 environment in agentos

Service	Status	Web	Updated (UTC)
agentos	😴 Sleeping (View Logs)	Web	Jul 14, 2026 at 1:28 pm

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🚅 Environment agentos-pr-1746 in rivet-frontend has no services deployed.