Add changeset for profiles, Pi, Kiro, and bug fixes (#747)

Author: TabishB

.changeset/profiles-pi-kiro.md

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+---
+"@fission-ai/openspec": minor
+---
+
+### New Features
+
+- **Profile system** — Choose between `core` (4 essential workflows) and `custom` (pick any subset) profiles to control which skills get installed. Manage profiles with the new `openspec config profile` command
+- **Propose workflow** — New one-step workflow creates a complete change proposal with design, specs, and tasks from a single request — no need to run `new` then `ff` separately
+- **AI tool auto-detection** — `openspec init` now scans your project for existing tool directories (`.claude/`, `.cursor/`, etc.) and pre-selects detected tools
+- **Pi (pi.dev) support** — Pi coding agent is now a supported tool with prompt and skill generation
+- **Kiro support** — AWS Kiro IDE is now a supported tool with prompt and skill generation
+- **Sync prunes deselected workflows** — `openspec update` now removes command files and skill directories for workflows you've deselected, keeping your project clean
+- **Config drift warning** — `openspec config list` warns when global config is out of sync with the current project
+
+### Bug Fixes
+
+- Fixed onboard preflight giving a false "not initialized" error on freshly initialized projects
+- Fixed archive workflow stopping mid-way when syncing — it now properly resumes after sync completes
+- Added Windows PowerShell alternatives for onboard shell commands