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

skills/opencode-plugins/templates/opencode-plugin-config.jsonc

@@ -0,0 +1,122 @@
+// opencode.jsonc — plugin configuration template
+//
+// Docs: https://opencode.ai/v2/docs/plugins
+// Terminal plugins: https://opencode.ai/v2/docs/cli/plugins
+//
+// https://opencode.ai/v2/docs/config states: "OpenCode supports JSON and
+// JSONC. Use JSONC when you want comments or trailing commas." Use the
+// two-slash form used below. (Hash comments would not parse — that is a
+// property of JSONC, not something the page states.)
+//
+// Keep the $schema line to match the docs. Be aware that
+// https://opencode.ai/config.json does not match the V2 config shape: its
+// Config has additionalProperties: false, has no "plugins" key, types "skills"
+// as an object, and has no "worktree" key. So some editors will flag the array
+// below as invalid. There is no published V2 config schema
+// (https://opencode.ai/v2/config.json returns 404). Never infer V2 field names
+// from that file. Drop the line if you prefer a clean editor.
+
+{
+  "$schema": "https://opencode.ai/config.json",
+
+  "plugins": [
+    // --- package plugins ---
+    "opencode-acme-plugin",
+    "opencode-acme-plugin@1.2.0", // exact versions stay pinned
+    "@acme/opencode-plugin",
+
+    // --- local paths ---
+    // RELATIVE PATHS RESOLVE FROM THE CONFIG FILE CONTAINING THIS ENTRY,
+    // not from the working directory. (The `skills` array is the opposite.)
+    "./plugins/local",
+    "../shared/plugin.ts",
+    "/absolute/path/plugin.ts",
+    "file:///home/me/plugins/local",
+
+    // --- with options --- (read them in setup via ctx.options, untyped)
+    {
+      "package": "./plugins/company",
+      "options": {
+        "strict": true
+      }
+    }
+  ]
+}
+
+// ---------------------------------------------------------------------------
+// Disabling plugins
+//
+// Entries are processed in order. Prefix an ID or wildcard with "-" to disable,
+// "*" for every plugin, ".*" for an ID prefix. A later ID re-enables one.
+//
+//   "plugins": ["*", "-opencode.provider.*", "opencode.provider.openai", "-acme.reviewer"]
+//
+// Two built-ins ignore removals so a repository cannot switch off policy
+// enforcement: opencode.config.policy and opencode.provider.opencode.
+//
+// ---------------------------------------------------------------------------
+// CLI-only plugins go in cli.json, not here.
+//
+// A plugin in this file that exports "./tui" is loaded automatically by the CLI.
+// Do NOT also add it to cli.json. The CLI gets the active plugin list from the
+// connected server, so it works when the server is remote.
+//
+// cli.json is for plugins that run locally in the terminal and must stay active
+// against a remote server.
+//
+// ---------------------------------------------------------------------------
+// Precedence
+//
+// Plugin arrays from applicable config files apply from lowest to highest
+// precedence rather than replacing one another:
+//
+//   ~/.config/opencode/opencode.jsonc
+//   ./opencode.jsonc
+//   ./.opencode/opencode.jsonc
+//
+// ---------------------------------------------------------------------------
+// Discovery
+//
+// Direct .ts/.js files and immediate package directories load from every
+// discovered .opencode/plugins/, plus the global config directory:
+//
+//   .opencode/plugins/concise.ts
+//   .opencode/plugins/acme-package/
+//   ~/.config/opencode/plugins/status/index.ts
+//   ~/.config/opencode/plugins/status/tui.ts
+//
+// A plugins/ directory beside a project-root opencode.json(c) is NOT
+// discovered automatically — configure it explicitly or move it under .opencode/.
+//
+// ---------------------------------------------------------------------------
+// CLI commands
+//
+// add and remove write to the GLOBAL config (~/.config/opencode/opencode.jsonc).
+//
+//   opencode plugin add opencode-acme-plugin@1.2.0
+//   opencode plugin add github:acme/opencode-plugin
+//   opencode plugin add 'github:acme/plugins#main::path:packages/opencode-plugin'
+//   opencode plugin list
+//   opencode plugin list --builtin
+//   opencode plugin check
+//   opencode plugin update
+//   opencode plugin update opencode-acme-plugin
+//   opencode plugin remove opencode-acme-plugin@1.2.0
+//
+// Pass a configured package target to check or update only that package.
+// plugin add accepts npm names with versions, tags, or ranges, plus
+// npm-compatible Git specs. Tarballs and npm aliases are NOT accepted.
+//
+// plugin check covers server and TUI-only package plugins. Local plugins and
+// exact package revisions are skipped.
+//
+// ---------------------------------------------------------------------------
+// Reload
+//
+// Watched config directories reload automatically. Startup loads cached package
+// plugins immediately, installs missing packages in the background, and checks
+// unpinned npm and Git plugins for updates without changing the installed
+// package. Exact versions and full commit hashes stay pinned.
+//
+//   touch .opencode/plugins/concise/index.ts
+//   opencode service restart   // for unwatched local dependencies