Create mcpcat.md

Author: harsha-iiiv

.github/PULL_REQUEST_TEMPLATE/mcpcat.md

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+# Add optional MCPcat analytics scaffolding (`--with-mcpcat`) to generated MCP servers
+
+> **TL;DR**: This PR adds an **opt-in** flag to scaffold privacy-safe analytics wiring for MCPcat in projects generated by `openapi-mcp-generator`.
+
+## Summary
+This PR introduces a `--with-mcpcat` CLI flag that scaffolds:
+- A tiny analytics shim to emit initialize/tool-call events.
+- A default **local redaction** helper to scrub sensitive data before export.
+- Minimal config via environment variables.
+No behavior changes unless the flag and env vars are set.
+
+## Motivation
+- Make freshly generated MCP servers **observable in minutes**.
+- Encourage **privacy-by-default** analytics patterns.
+- Reduce copy/paste wiring; standardize event shape (operationId, path, duration, status).
+
+## Changes
+### CLI
+- `generate` accepts `--with-mcpcat` (default: off).
+
+### Template files (added conditionally)
+- `src/analytics/mcpcat.ts` – lazy import + safe no-op if SDK absent.
+- `src/analytics/redact.ts` – OpenAPI-aware heuristics (e.g., `*token*`, `password`, `apiKey`, `authorization`, `email`).
+- `src/analytics/config.ts` – reads env:
+  - `MCPCAT_ENABLED=true|false` (default `false`)
+  - `MCPCAT_PROJECT_ID=<id>`
+  - `MCPCAT_ENDPOINT=<optional override>`
+  - `MCPCAT_SAMPLE_RATE=1.0` (0–1)
+
+### Server wiring
+- Hooks server `.initialize` and each tool invocation to record:
+  - `operationId`, HTTP `method`, `path`
+  - redacted `args`
+  - `outcome` (`ok`/`error`) + truncated error message
+  - `duration_ms`
+
+### Docs
+- Adds a “Enable analytics (MCPcat)” section to generated README with privacy notes and quickstart.
+
+## Implementation Notes
+- **Compile-time optional**: no imports unless flag is used.
+- **Runtime safe**: try/catch around SDK import → graceful no-op if not installed.
+- **Transport-agnostic**: compatible with stdio, SSE/web, and StreamableHTTP templates.
+- **Edge-friendly**: avoids Node-only APIs in scaffolding to support edge runtimes (e.g., Workers).