feat(local-qa): implement Run Coordinator walking skeleton

[wanghuan-520]

Linked Issue

Closes #5942

Summary

• add SQLite journal v3 with durable at-most-once execution attempts and terminal outcomes
• run one Host-owned coordinator through the complete nine-state lifecycle using a deterministic passing executor
• preserve exact admission/replay/read bytes, transactional Events, registered lifecycle validation, and graceful SIGTERM/Ctrl-C shutdown
• cover real loopback execution, v1/v2 migration, replay/cancellation races, atomic completion, and coordinator joining

Type of Change

• Bug fix
• Feature / enhancement
• Refactor / chore
• Documentation

Affected Area

• Backend (Rust)
• Frontend (React)
• Local QA Runtime (Rust)

How to Test

cargo fmt --manifest-path apps/local-qa-runtime/Cargo.toml --all -- --check
cargo clippy --manifest-path apps/local-qa-runtime/Cargo.toml --workspace --all-targets --locked -- -D warnings
cargo build --manifest-path apps/local-qa-runtime/Cargo.toml --workspace --locked
cargo test --manifest-path apps/local-qa-runtime/Cargo.toml --workspace --locked
cargo check --manifest-path apps/local-qa-runtime/Cargo.toml --workspace --all-targets --locked --target aarch64-apple-darwin
cargo check --manifest-path apps/local-qa-runtime/Cargo.toml --workspace --all-targets --locked --target x86_64-pc-windows-msvc
bash apps/local-qa-runtime/tests/scaffold-structure.sh

Checklist

• A corresponding GitHub issue exists and is linked above (Closes #N).
• This PR targets develop / develop-auto, or the linked issue explicitly authorizes its named integration branch (never main directly).
• The change is small and self-contained.
• Stays within fkst-hosted scope — no kernel-engine changes.
• Tests / checks pass locally.
• No secrets or credentials are committed.