fix(server.json): shorten description to ≤100 chars for MCP Registry

The v0.1.5 release.yml run failed at the publish-mcp-registry job's
validate step: MCP Registry's schema enforces body.description ≤ 100
chars, but the v0.1.5 server.json description was 152 chars.

PyPI accepted the longer form (no such limit there) so v0.1.5 is live
on PyPI with attestations, but MCP Registry stayed at v0.1.4.

Tightened to 96 chars while preserving all three locked anchor phrases
(canonical Python stdlib oracle / always free, always MIT / token-frugal)
per .planning/POSITIONING.md's adapt-for-length contract:

  "The canonical Python stdlib oracle for AI coding agents
  — always free, always MIT, token-frugal."

pyproject.toml description stays at 154 chars (PyPI summary limit is
512 — the surface-specific length contract intentionally varies).

This unblocks the next release: with this fix on main, the next tag
push will publish to MCP Registry successfully.

Author: ayhammouda

server.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
   "name": "io.github.ayhammouda/python-docs-mcp-server",
-  "description": "The canonical Python stdlib oracle for AI coding agents. Exact symbols, exact sections, exact versions — offline, always free, always MIT, token-frugal.",
+  "description": "The canonical Python stdlib oracle for AI coding agents — always free, always MIT, token-frugal.",
   "title": "Python Docs MCP Server",
   "websiteUrl": "https://github.com/ayhammouda/python-docs-mcp-server",
   "repository": {