feat(cli): embed persistent PTY service binaries

[jlongster]

Summary

• pin opencode-pty v0.1.4 and verify SHA-256 checksums for six Linux/macOS archives
• embed the native daemon into Bun executables and existing Node SEA asset bundles
• lazily extract Bun assets into private content-addressed executable caches with checksum, ownership, and permission checks
• preserve OPENCODE_PTY_BIN overrides and leave unsupported Windows targets unchanged

Verification

• bun run typecheck in packages/core and packages/cli
• bun test test/persistent-pty-binary.test.ts in packages/core
• bun test test/node-assets.test.ts in packages/cli
• real opencode-pty v0.1.4 server integration test passes
• compiled Bun smoke test embeds, extracts, starts the daemon, creates a terminal through the HTTP API, and snapshots its output

Stack: 3/5, based on #44832; next PR adds the TUI workspace.