Add repo-specific Copilot instructions and VS Code inline chat settings

Introduces a detailed .github/copilot-instructions.md to guide AI agents on repository conventions, workflows, and validation rules. Updates .vscode/settings.json to enable and configure VS Code inline chat features for improved developer experience.

.github/copilot-instructions.md

@@ -1,3 +1,47 @@
+## .github/copilot-instructions.md — repo-specific guidance for AI agents
+
+Purpose: give an AI coding agent the minimal, high-value facts to be immediately productive in this repository.
+
+Key locations (what to read first)
+- `README.md` — project overview and MCP server notes (README is generated by `update-readme.js`).
+- `prompts/`, `instructions/`, `chatmodes/`, `collections/` — primary content types and their file patterns.
+- `update-readme.js` — script that builds README tables and badges; it shows how titles/descriptions are extracted from frontmatter or headings.
+- `validate-collections.js` and `yaml-parser.js` — collection manifest rules and validation logic (see file-kind checks, ID/tag constraints, and item path checks).
+
+Big picture
+- This repo is a curated library of Copilot artifacts: prompts (`.prompt.md`), instructions (`.instructions.md`), and chat modes (`.chatmode.md`). Collections (`.collection.yml`) reference those files and are validated by `validate-collections.js`.
+- README content is regenerated from source files by running `node update-readme.js` (or `npm run build`), which expects predictable frontmatter and filename patterns.
+
+Developer workflows (explicit commands)
+- Generate README: `npm run build` (runs `node update-readme.js`).
+- Validate collections: `node validate-collections.js` (script exits non‑zero on failure).
+- Contributor tasks: all-contributors commands are available (`npm run contributors:generate`, etc.).
+- VS Code tasks are present for `generate-readme`, `validate-collections`, and `create-collection` (see workspace tasks in the README).
+
+Project-specific conventions (discoverable and enforced)
+- File extensions map to kinds: prompts → `.prompt.md`; instructions → `.instructions.md`; chat modes → `.chatmode.md`. `validate-collections.js` enforces this.
+- Collection `items[].kind` must be one of `prompt`, `instruction`, `chat-mode` and the `path` must point to an existing file with the correct extension.
+- Collection IDs and tags: lowercase, hyphen-separated; length and character checks are enforced in `validate-collections.js`.
+- Frontmatter usage: `update-readme.js` prefers frontmatter `title` and `description`. If missing, it falls back to the first `# ` heading or a formatted filename.
+- Description handling: single-line `description:` or multi-line `description: |` blocks are supported by `update-readme.js`.
+
+Patterns & examples (copyable references)
+- Title extraction: `update-readme.js` looks for `title:` in frontmatter, then `# ` heading after frontmatter, then falls back to filename formatting.
+- Description extraction: accepts single-line `description: '...'` (single quotes supported) or multiline `description: |` and two-space indented lines.
+- Collection validation: `validate-collections.js` checks structure (id/name/description/tags/items/display), enforces `MAX_COLLECTION_ITEMS`, and verifies that each `items[].path` exists.
+
+Actionable checklist for AI agents (use before committing)
+- [ ] New `.prompt.md`, `.instructions.md`, or `.chatmode.md` include frontmatter with `title` and `description` (use single quotes for description when needed).
+- [ ] Filenames are lower-case, words separated by hyphens, and extensions match their kind.
+- [ ] If you want the artifact listed in README tables, either include frontmatter title/description or ensure a top-level `# ` heading is present.
+- [ ] If adding a collection `.collection.yml`: set valid `id`, `name`, `description`, `tags`, and `items` matching the validator rules. Run `node validate-collections.js` locally.
+- [ ] Run `npm run build` locally to regenerate the README and confirm the new entries appear as expected.
+
+Notes and cautions
+- Avoid changing `update-readme.js` behavior unless necessary; many repo tools and badge URLs (aka.ms mapping) depend on its link-generation logic.
+- `validate-collections.js` is the authoritative enforcement for collection manifests. Fix validation errors rather than bypassing them.
+
+If you want examples added to this file (sample frontmatter templates, CI snippet to run these checks, or a helper script to lint frontmatter), tell me which example and I'll add it.
 The following instructions are only to be applied when performing a code review.
 
 ## README updates

.vscode/settings.json

@@ -22,5 +22,10 @@
     "*.chatmode.md": "markdown",
     "*.instructions.md": "markdown",
     "*.prompt.md": "markdown"
-  }
+  },
+  "inlineChat.enableV2": true,
+  "inlineChat.finishOnType": true,
+  "inlineChat.hideOnRequest": true,
+  "inlineChat.lineEmptyHint": true,
+  "inlineChat.notebookAgent": true
 }