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>

action.yml

@@ -105,6 +105,10 @@ inputs:
     description: "GitHub username to use for git operations (defaults to Claude's bot name)"
     required: false
     default: "claude[bot]"
+  bot_email:
+    description: "Email to use for git commits. When set, overrides the default noreply email format. Useful for Forgejo where matching the user's registered email links commits to the profile."
+    required: false
+    default: ""
   track_progress:
     description: "Force tag mode with tracking comments for pull_request and issue events. Only applicable to pull_request (opened, synchronize, ready_for_review, reopened) and issue (opened, edited, labeled, assigned) events."
     required: false
@@ -245,6 +249,7 @@ runs:
         SSH_SIGNING_KEY: ${{ inputs.ssh_signing_key }}
         BOT_ID: ${{ inputs.bot_id }}
         BOT_NAME: ${{ inputs.bot_name }}
+        BOT_EMAIL: ${{ inputs.bot_email }}
         TRACK_PROGRESS: ${{ inputs.track_progress }}
         INCLUDE_FIX_LINKS: ${{ inputs.include_fix_links }}
         ADDITIONAL_PERMISSIONS: ${{ inputs.additional_permissions }}