squad upgrade --self --insider: misplaced templates, Rai not installed, --state-backend ignored #1185

Upgraded from v0.9.6-insider.2 -> v0.9.6-insider.3 via squad upgrade --self --insider. Three distinct issues:

1. Templates dumped at .squad/ root

~20 template files were copied into .squad/ root in addition to .squad/templates/ (e.g. Rai-charter.md, rai-policy.md, scribe-charter.md, charter.md, history.md, roster.md, casting-*.json, copilot-instructions.md, mcp-config.md, multi-agent-format.md, orchestration-log.md, plugin-marketplace.md, etc.). All were exact duplicates of .squad/templates/* — had to delete manually.

2. Rai not actually installed

Despite Rai being a built-in roster member, upgrade did NOT:

• create .squad/agents/Rai/{charter,history}.md
• create .squad/rai/{policy,audit-trail}.md
• add Rai row to team.md or routing.md
• add .squad/rai/audit-trail.md merge=union to .gitattributes

3. --state-backend flag ignored

From existing orphan backend, neither worked:

squad upgrade --state-backend two-layer
squad upgrade --state-backend local

Got an error that upgrade from "orphan" to "two-layer" isn't supported.

Environment

• squad-cli: 0.9.6-insider.3 (from 0.9.6-insider.2), channel: insider
• Windows 11, PowerShell, Node v24.14.1 (nvm)

Expected

1. Upgrade should not dump templates at .squad/ root.
2. Built-in roster members (Rai) should auto-install if missing.
3. --state-backend <value> should migrate