v0.5.4

What's Changed

• install: tarball install per-OS, drop the broken Homebrew tap by @Siddhesh2377 in #69
• harness: add wally codex (hosted, Responses API) by @Siddhesh2377 in #70
• opencode: quote Windows spawn arguments by @Siddhesh2377 in #71
• skill: add the install step so it's self-sufficient by @Siddhesh2377 in #68
• install: nightly (dev) arg + cleaner progress by @Siddhesh2377 in #72
• skill: name Wally in the trigger by @Siddhesh2377 in #73
• harness: default model for launches + --help regroup (release 0.5.4) by @Siddhesh2377 in #74

Full Changelog: v0.5.3...v0.5.4