feat(rename): rebrand CLI from agentkit to retort with deprecated alias

[JustAGhosT]

Summary

• agentkit CLI → retort CLI across the entire framework
• agentkit:* pnpm scripts kept as deprecated aliases for one release cycle
• GENERATED by AgentKit Forge → GENERATED by Retort in all output headers
• validate.mjs accepts both old and new headers (backward compat for already-generated files)
• All test assertions updated

What changed

Layer	Change
.agentkit/package.json	name retort-runtime, added retort:* scripts, kept agentkit:* as aliases
package.json (root)	name retort-root, added retort:* scripts, ak:* updated to call retort:*
cli.mjs	Banner Retort v{VERSION}, log prefix [retort:]
template-utils.mjs / synchronize.mjs	GENERATED header string → GENERATED by Retort
validate.mjs	Accepts GENERATED by Retort OR GENERATED by AgentKit Forge
124 template files	AgentKit Forge → Retort, agentkit:sync → retort:sync
38 engine source files	AgentKit → Retort throughout
Test suite	All AgentKit Forge / [agentkit:sync] assertions updated

Migration for downstream users

# Old (still works for one release cycle)
pnpm -C .agentkit agentkit:sync

# New (canonical)
pnpm -C .agentkit retort:sync

# Root shortcuts
pnpm retort:sync    # new canonical
pnpm ak:sync        # still works

Rationale

agentkit is dominated by Anthropic's own AgentKit/Agent SDK branding. Holding the name creates discoverability and trust confusion. retort is unique, memorable, and matches the repo identity.

Test plan

• pnpm test passes (engine test suite)
• pnpm retort:sync generates output
• pnpm ak:sync still works (deprecated alias)
• Generated files contain GENERATED by Retort header
• CI passes

🤖 Generated with Claude Code

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