chore: clean stale gitignore entries for removed dirs

Remove entries for org-templates/, plugins/, docs/.vitepress/dist/
that no longer exist. Deduplicate .claude-bridge/ entry.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -106,14 +106,10 @@ logs/
 
 # Backups
 backups/
-docs/.vitepress/dist/
 .claude-bridge/
-org-templates/**/.env
-org-templates/**/.auth-token
 
-# Migration additions (2026-04-13)
+# Migration additions
 .initial_prompt_done
-.claude-bridge/
 
 # GitHub App private key + other local-only secrets — never committed.
 .secrets/
@@ -121,14 +117,6 @@ org-templates/**/.auth-token
 
 # Cloned-via-manifest dirs — populated locally by scripts/clone-manifest.sh,
 # tracked in their own standalone repos. Never commit to core.
-# Ignore all cloned org-template content except the molecule-dev reference
-# system-prompt template (tracked in core as the canonical shared-context
-# source; role-specific prompts live in molecule-ai-org-template-molecule-dev).
-# Pattern uses content-glob (/org-templates/*) rather than directory-ignore
-# (/org-templates/) so git can re-include specific files via ! negation.
-/org-templates/*
-!/org-templates/molecule-dev
-/org-templates/molecule-dev/*
-!/org-templates/molecule-dev/system-prompt.md
+/org-templates/
 /plugins/
 /workspace-configs-templates/