v1.2.0

• Spawn templates. A template is a named, partial spawn input kept as <config dir>/templates/<name>.json; sesshin spawn --template opus --prompt '…' merges your options over it, in the operation, so -i callers get templates too ({"template": "opus", …}). Its keys are job, cwd, type, name, prompt or prompt_file, args, vars, start_timeout_secs, and description; yours win, args add after the template's, and cwd falls back to the directory you ran sesshin in. sesshin templates lists them, flagging any spawn would refuse. (Templates, Merging a template, configuration)
• Which template launched a session is recorded: template in sesshin.json and the session view, null for a session launched without one. Needs migrate: migration 2 adds template to every sesshin.json (format 2 → 3), and reservations go to format 3 too. Run sesshin migrate after upgrading. A session launched by the previous version that has not started when the new hooks arrive (waiting at the workspace-trust dialog, say) gets its job from SESSHIN_JOB only, with extra {}.
• Error changes. not-found gains templates in its details, empty unless a template is what is missing. spawn no longer requires cwd in its input schema (a template, or the working directory, can give it), and its errors are checked in a new order: a template's own errors come before busy, and invalid-input for a missing cwd after them.