Version OpenCode skills and plugins

Repository sits at the OpenCode config root rather than inside skills/ or
plugins/. OpenCode scans exactly those two subdirectories, and a .git
directory inside either one is picked up as a plugin and fails to load:

  loading plugin id=.../plugins/.git entrypoint=.../plugins/.git/index
  failed to load plugin ... AggregateError: 2 errors building .../plugins/.git/index

The watcher.ignore config option does not help: it only suppresses filesystem
update events, not plugin discovery, and the "-" disable prefix only applies to
plugins listed in opencode.json(c), not auto-discovered ones.

.gitignore admits only skills/ and plugins/ (plus itself). Personal config
(opencode.jsonc, cli.json, service.json) and node_modules stay local.

skills/opencode-plugins  V2-only plugin authoring reference and 7 templates,
                         transcribed from the V2 docs with the URL on every file
plugins/searxng-search   searxng_search tool over a self-hosted SearXNG JSON API

.gitignore

@@ -0,0 +1,24 @@
+# Version only the skills and plugins trees.
+#
+# This directory is the OpenCode config root. OpenCode scans exactly two
+# subdirectories for content:
+#
+#   ~/.config/opencode/skills/     -> agent skills
+#   ~/.config/opencode/plugins/   -> server plugins (auto-discovered)
+#
+# A .git directory inside either of those gets picked up as a plugin and fails
+# to load, so the repository lives one level up, here, and everything that is
+# not skills/ or plugins/ is ignored.
+#
+# Ignore every top-level entry, then re-admit only the two content trees and
+# this file. A bare /* is not enough: git will not descend into an ignored
+# directory, so the un-ignore rules are required.
+
+/*
+!/skills/
+!/plugins/
+!/.gitignore
+
+# Belt and braces, in case a path is ever added from the parent side.
+node_modules/
+*.log