feat(prd-5): add dedicated claude-bot user for Forgejo

- Add bot_email action input for custom git commit email on Forgejo
- Update claude.yml to use CLAUDE_BOT_TOKEN with bot_id/bot_name/bot_email
- Update git-config.ts to use provided email over noreply format
- Add "Dedicated Bot User" setup guide to docs/forgejo.md
- Update CLAUDE.md with bot identity documentation

Infrastructure (done outside code):
- claude-bot user created (ID 48, non-admin, with avatar)
- Claude team with write access in all 12 orgs
- CLAUDE_BOT_TOKEN org-level secret in all 12 orgs

Progress: ~85% complete - pending E2E validation after merge

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

test/modes/detector.test.ts

@@ -23,6 +23,7 @@ describe("detectMode with enhanced routing", () => {
       sshSigningKey: "",
       botId: "123456",
       botName: "claude-bot",
+      botEmail: "",
       allowedBots: "",
       allowedNonWriteUsers: "",
       trackProgress: false,