chore: add changeset for native Windows support

Minor bump across the linked package group. The next release PR will
consume this and bump from 0.4.0 to 0.5.0.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.changeset/native-windows-support.md

@@ -0,0 +1,49 @@
+---
+"@aoagents/ao-core": minor
+"@aoagents/ao-cli": minor
+"@aoagents/ao": minor
+"@aoagents/ao-plugin-runtime-process": minor
+"@aoagents/ao-plugin-runtime-tmux": minor
+"@aoagents/ao-plugin-agent-claude-code": minor
+"@aoagents/ao-plugin-agent-codex": minor
+"@aoagents/ao-plugin-agent-aider": minor
+"@aoagents/ao-plugin-agent-opencode": minor
+"@aoagents/ao-plugin-workspace-worktree": minor
+"@aoagents/ao-plugin-workspace-clone": minor
+"@aoagents/ao-plugin-tracker-github": minor
+"@aoagents/ao-plugin-tracker-linear": minor
+"@aoagents/ao-plugin-scm-github": minor
+"@aoagents/ao-plugin-notifier-desktop": minor
+"@aoagents/ao-plugin-notifier-slack": minor
+"@aoagents/ao-plugin-notifier-webhook": minor
+"@aoagents/ao-plugin-notifier-composio": minor
+"@aoagents/ao-plugin-terminal-iterm2": minor
+"@aoagents/ao-plugin-terminal-web": minor
+"@aoagents/ao-web": minor
+---
+
+feat: native Windows support
+
+AO now runs natively on Windows. The default runtime on Windows is `process`
+(ConPTY via `node-pty` + named pipes — no tmux, no WSL); the dashboard,
+agents (claude-code, codex, kimicode, aider, opencode, cursor), `ao doctor`,
+and `ao update` all work out of the box. Each session gets a small detached
+pty-host helper that wraps a ConPTY behind `\\.\pipe\ao-pty-<sessionId>`,
+registered so `ao stop` can reach it.
+
+A new cross-platform abstraction layer (`packages/core/src/platform.ts`)
+centralises every platform branch behind helpers like `isWindows()`,
+`getDefaultRuntime()`, `getShell()`, `killProcessTree()`, `findPidByPort()`,
+and `getEnvDefaults()`. Path comparison uses `pathsEqual` /
+`canonicalCompareKey` to handle NTFS case-insensitivity. PATH wrappers for
+agent plugins (`gh`, `git`) ship as `.cjs` + `.cmd` shims on Windows;
+`script-runner` runs `.ps1` siblings of `.sh` scripts via PowerShell. New
+`ao-doctor.ps1` / `ao-update.ps1` shipped.
+
+Behaviour on macOS and Linux is unchanged. Every Windows path is gated
+behind `isWindows()`; `runtime-tmux` and the bash hook flows are untouched.
+
+See `docs/CROSS_PLATFORM.md` for the developer reference (helper inventory,
+EPERM-vs-ESRCH gotcha, PowerShell-vs-bash differences, pre-merge checklist).
+The Windows runtime architecture (pty-host, pipe protocol, registry, sweep,
+mux WS Windows branch) is documented in `docs/ARCHITECTURE.md`.