docs: README improvements for v2.0.3 (#40)

* release: bump to v2.0.3

* fix: bump plugin version to 2.0.14 to bust marketplace cache

Aligns plugin version with MCP server v2.x major version line and
forces Claude Code to re-fetch updated marketplace listing (removes
stale clockwork/current dual-plugin view from cached installs).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* docs: overhaul CLAUDE.md for v3 accuracy and token efficiency

- Remove stale v2/Clockwork content (wrong tool names, wrong paths, wrong architecture)
- Update all source paths to current/ module (io.github.jpicklyk.mcptask.current)
- Remove MCP tool documentation (covered by tool descriptions at session start)
- Remove sections Claude can infer from code (design patterns, version format, etc.)
- Reduce from 443 lines (~5,500 tokens) to 161 lines (~1,700 tokens) — 69% reduction

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* docs: add per-project data isolation section to README

Explains how to scope the Docker volume name per project for isolated
SQLite databases, and recommends combining it with the per-project .mcp.json.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: jpicklyk