feat(cli): add agent local-cli command for skill install and env export

New subcommand to install Paperclip skills for Claude/Codex agents and
print the required PAPERCLIP_* environment variables for local CLI
usage outside heartbeat runs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

doc/CLI.md

@@ -116,6 +116,20 @@ pnpm paperclipai issue release <issue-id>
 ```sh
 pnpm paperclipai agent list --company-id <company-id>
 pnpm paperclipai agent get <agent-id>
+pnpm paperclipai agent local-cli <agent-id-or-shortname> --company-id <company-id>
+```
+
+`agent local-cli` is the quickest way to run local Claude/Codex manually as a Paperclip agent:
+
+- creates a new long-lived agent API key
+- installs missing Paperclip skills into `~/.codex/skills` and `~/.claude/skills`
+- prints `export ...` lines for `PAPERCLIP_API_URL`, `PAPERCLIP_COMPANY_ID`, `PAPERCLIP_AGENT_ID`, and `PAPERCLIP_API_KEY`
+
+Example for shortname-based local setup:
+
+```sh
+pnpm paperclipai agent local-cli codexcoder --company-id <company-id>
+pnpm paperclipai agent local-cli claudecoder --company-id <company-id>
 ```
 
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