feat(please-plugins): add find-plugin skill for marketplace discovery (#156)

* feat(please-plugins): add find-plugin skill for marketplace discovery

Searches marketplace.json catalog and installed plugin skill files
to recommend relevant plugins based on user queries.

* chore: apply AI code review suggestions for find-plugin skill

* chore: apply AI code review suggestions

Make skill search case-insensitive by adding -i flag to grep command in find-plugin SKILL.md

Author: amondnet

plugins/please-plugins/skills/find-plugin/SKILL.md

@@ -0,0 +1,118 @@
+---
+name: Find Plugin
+description: Helps users discover and install Claude Code plugins from the pleaseai marketplace. Use this skill whenever a user asks "how do I do X", "find a plugin for X", "is there a plugin that can...", "recommend a plugin", "what plugins are available", wants to extend Claude Code capabilities, or mentions a technology/framework and could benefit from a plugin they haven't installed yet. Also use when the user is stuck on a task that an available plugin could solve, even if they don't explicitly ask for a plugin.
+allowed-tools: Bash, Read, Glob, Grep
+---
+
+# Find Plugin
+
+Search the pleaseai marketplace to discover and recommend Claude Code plugins that match the user's needs.
+
+## How It Works
+
+The marketplace provides two layers of discovery:
+
+1. **Plugin catalog** — the marketplace manifest lists every available plugin with its name, description, category, and keywords.
+2. **Skill index** — installed plugins expose skills (SKILL.md files) that describe specific capabilities in detail. Searching skill descriptions surfaces more precise matches than plugin metadata alone.
+
+## Step 1: Read the Marketplace Catalog
+
+```bash
+cat ~/.claude/plugins/marketplaces/pleaseai/.claude-plugin/marketplace.json
+```
+
+Parse the `plugins` array. Each entry contains:
+- `name` — plugin identifier (used in install command)
+- `description` — what the plugin does
+- `category` — broad domain (framework, tooling, database, ai, etc.)
+- `keywords` — searchable tags
+
+## Step 2: Search Installed Plugin Skills
+
+Skills offer richer descriptions than the top-level plugin metadata. Scan skill files for matches:
+
+```bash
+# List all available skill directories
+find ~/.claude/plugins/marketplaces/pleaseai/plugins/*/skills -maxdepth 1 -type d 2>/dev/null
+
+# Search skill descriptions for the user's query terms (covers both skills/ and .agents/skills/ layouts)
+grep -rilFi "<search-terms>" ~/.claude/plugins/marketplaces/pleaseai/plugins/*/{skills,.agents/skills}/*/SKILL.md 2>/dev/null
+```
+
+Read the SKILL.md frontmatter (`name` and `description` fields) of matching skills to understand what each one provides.
+
+## Step 3: Match and Rank
+
+Score each plugin against the user's query:
+
+1. **Direct keyword match** — plugin name, keywords, or category directly matches the query
+2. **Skill-level match** — a skill description within the plugin matches the query
+3. **Semantic match** — the plugin's description addresses the user's underlying need even without exact keyword overlap
+
+Prioritize plugins that solve the user's immediate problem over tangentially related ones. Deduplicate the combined results from Step 1 and Step 2 before ranking — the same plugin may appear in both the catalog and skill search.
+
+## Step 4: Present Recommendations
+
+For each recommended plugin, show:
+
+```
+**{plugin-name}** — {description}
+  Category: {category}
+  Install: claude plugin install {plugin-name}@pleaseai
+```
+
+Group results by relevance:
+- **Best matches** — directly address the user's need
+- **Related** — might be useful depending on context
+
+If a plugin is already installed, indicate that:
+```
+**{plugin-name}** (installed) — {description}
+```
+
+Check installed status from the installed plugins registry:
+```bash
+jq -r '.plugins | keys[]' ~/.claude/plugins/installed_plugins.json
+```
+
+Check if `{plugin-name}@pleaseai` appears in the output. A plugin is installed if its key exists in this file.
+
+## Step 5: Offer Installation
+
+After presenting recommendations, offer to install:
+
+> "Want me to install any of these? Just say which ones."
+
+Install with:
+```bash
+claude plugin install {plugin-name}@pleaseai
+```
+
+## When No Plugin Exists
+
+If no plugin matches the user's need:
+
+1. Say so clearly — don't force a bad match
+2. Offer to help directly with the task using available tools
+3. If the need is common enough, suggest it could become a plugin
+
+## Plugin Categories
+
+Quick reference for the types of plugins available:
+
+| Category | Examples |
+|----------|----------|
+| **Framework** | nuxt, vue, react, next, vitepress, slidev, tiptap |
+| **Mobile** | flutter, react-native |
+| **Database** | prisma, supabase, mcp-neo4j |
+| **Tooling** | vite, pnpm, turborepo, tsdown, gatekeeper, ast-grep |
+| **AI** | nanobanana, ai-sdk, mastra, gemini |
+| **Monitoring** | grafana, sentry, posthog |
+| **Cloud/Deploy** | firebase, vercel |
+| **Payments** | stripe, tosspayments, revenuecat |
+| **Browser** | chrome-devtools-mcp, agent-browser, playwright-cli |
+| **Productivity** | google-workspace, notion |
+| **Security** | gemini-cli-security |
+| **Review** | code-review, cubic |
+| **Document** | markitdown, edgeparse, fetch |
+| **Development** | plugin-dev, mcp-dev, please-plugins, git-ai |