Repository maintenance: update deps, add Copilot setup, bump to 2.0.6 (#7)

Co-authored-by: Hexagon <419737+Hexagon@users.noreply.github.com>

Author: Copilot

.github/workflows/copilot-setup-steps.yml

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+name: "Copilot Setup Steps"
+
+# Automatically run the setup steps when they are changed to allow for easy validation, and
+# allow manual testing through the repository's "Actions" tab
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+  pull_request:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+
+jobs:
+  # The job MUST be called `copilot-setup-steps` or it will not be picked up by Copilot.
+  copilot-setup-steps:
+    runs-on: ubuntu-latest
+
+    # Set the permissions to the lowest permissions possible needed for your steps.
+    # Copilot will be given its own token for its operations.
+    permissions:
+      # If you want to clone the repository as part of your setup steps, for example to install dependencies, you'll need the `contents: read` permission. If you don't clone the repository in your setup steps, Copilot will do this for you automatically after the steps complete.
+      contents: read
+
+    # You can define any steps you want, and they will run before the agent starts.
+    # If you do not check out your code, Copilot will do this for you.
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "lts/*"
+          cache: "npm"
+
+      - name: Install dependencies
+        run: npm ci

AGENTS.md

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+# Thinker-FTS - Agent Guide
+
+## Project Overview
+
+Thinker-FTS is a fast, extendable, and standalone pure JavaScript full-text search engine that works across Node.js, Deno, and browsers.
+
+## Project Structure
+
+```
+thinker-fts/
+├── src/                  # Source code
+│   ├── Thinker.js       # Main entry point
+│   ├── Thinker.single.js # Single export wrapper
+│   ├── index.js         # Index backend
+│   ├── processors.js    # Word/field processors (stemmers, soundex, etc.)
+│   ├── rankers.js       # Result ranking algorithms
+│   └── utils.js         # Helper utilities
+├── test/                # Test files
+│   ├── test.js          # Main test entry (ESM)
+│   ├── test.cjs         # CommonJS test entry
+│   └── suites/          # Test suites
+│       └── default.cjs  # Main test suite
+├── dist/                # Built distribution files
+│   ├── thinker.cjs      # UMD module
+│   ├── thinker.mjs      # ES module
+│   └── thinker.min.*    # Minified versions
+└── rollup.config.js     # Build configuration
+```
+
+## Development Environment
+
+The project uses **Node.js** as the primary development runtime with ES modules.
+
+### Setup
+```bash
+npm ci
+```
+
+## Contribution Guidelines
+
+### Pre-commit Checks
+
+Before committing changes, always run:
+```bash
+npm run test
+```
+
+This executes:
+- **Linting**: `eslint ./**/*.js` - checks for code quality issues
+- **Testing**: `mocha` - runs the test suite
+
+### Testing
+
+Run tests during development:
+```bash
+npm run test
+```
+
+Run tests with coverage:
+```bash
+npm run test:coverage
+```
+
+### Full Build
+
+Before submitting a PR, run the full build to ensure all checks pass:
+```bash
+npm run build:ci
+```
+
+This runs linting, builds distribution files, and runs tests with coverage.
+
+### Key Points
+
+- Base work on the `master` branch
+- Add test cases for all changes
+- The project has few external dependencies - avoid adding new runtime dependencies
+- Follow existing code style (tabs, double quotes, semicolons)
+- Update documentation if changing public APIs
+- The `dist/` files are committed to the repository
+
+## Features
+
+- In-memory full-text search
+- Natural language search with modifiers (+, -, "exact")
+- Partial matching with wildcards
+- Weighted ranker with configurable field weights
+- Word processors: stemmers (English, Swedish), soundex, stopwords
+- Field processors: HTML stripper
+- Result filtering and reduction
+- Metadata collection