fission-ai__openspec/openspec/changes/update-cli-init-root-agents/tasks.md

1. Implementation

• 1.1 Refactor openspec init to always generate the root AGENTS.md stub (initial run and extend mode) via shared helper logic.
• 1.2 Rework the AI tool selection wizard to surface "Natively supported" vs "Other tools" groupings and make the stub non-optional.
• 1.3 Update CLI messaging, templates, and configurators so the new flow stays in sync across init and update commands.
• 1.4 Refresh unit/integration tests to cover the unconditional stub and the regrouped prompt layout.
• 1.5 Update documentation, README snippets, and CHANGELOG entries that mention the opt-in AGENTS.md experience.

2. Validation

• 2.1 Run pnpm test targeting CLI init/update suites.
• 2.2 Execute openspec validate update-cli-init-root-agents --strict.
• 2.3 Perform a manual smoke test: run openspec init in a temp directory, confirm stub + grouped prompts, rerun in extend mode.