feat: v0.3.0c — add labels, milestones, wiki, issue dependencies

New commands:
- fgj label list/create/edit/delete
- fgj milestone list/view/create/edit/delete
- fgj wiki list/view/create/edit/delete

Enhanced:
- fgj issue edit --add-dependency/--remove-dependency

README.md

@@ -13,6 +13,10 @@
 - Pull request management (create, list, view, merge, diff, comment, review)
 - Issue tracking (create, list, view, comment, close, labels)
 - Repository operations (view, list, create, edit, clone, fork)
+- Label management (list, create, edit, delete)
+- Milestone management (list, view, create, edit, delete)
+- Wiki page management (list, view, create, edit, delete)
+- Issue dependencies (`--add-dependency`, `--remove-dependency`)
 - Forgejo Actions (workflow runs, watch/rerun/cancel, enable/disable, secrets, variables)
 - Releases (create, upload, delete)
 - Raw API access (`fgj api`) for arbitrary REST calls
@@ -184,6 +188,68 @@ fgj issue close 456 -c "Fixed in v2.0"
 # Edit an issue (title, body, state, labels)
 fgj issue edit 456 -t "New Title"
 fgj issue edit 456 --add-label priority --remove-label bug
+
+# Manage issue dependencies
+fgj issue edit 456 --add-dependency 123
+fgj issue edit 456 --remove-dependency 123
+```
+
+### Labels
+
+```bash
+# List labels
+fgj label list
+
+# Create a label
+fgj label create bug --color ff0000 -d "Something isn't working"
+
+# Edit a label
+fgj label edit bug --name bugfix --color ee0000
+
+# Delete a label
+fgj label delete bug
+```
+
+### Milestones
+
+```bash
+# List milestones
+fgj milestone list
+fgj milestone list --state all
+
+# View a milestone
+fgj milestone view "v1.0"
+
+# Create a milestone with due date
+fgj milestone create "v2.0" -d "Next major release" --due 2026-06-01
+
+# Edit a milestone
+fgj milestone edit "v2.0" --title "v2.0-rc1" --state closed
+
+# Delete a milestone
+fgj milestone delete "v2.0"
+```
+
+### Wiki
+
+```bash
+# List wiki pages
+fgj wiki list
+
+# View a wiki page
+fgj wiki view "Home"
+
+# Create a wiki page
+fgj wiki create "Setup Guide" -b "# Setup\n\nFollow these steps..."
+
+# Create from file
+fgj wiki create "API Docs" --body-file docs/api.md
+
+# Edit a wiki page
+fgj wiki edit "Home" -b "Updated content"
+
+# Delete a wiki page
+fgj wiki delete "Old Page"
 ```
 
 ### Repositories