feat(cli): disable Claude auto-memory for Synapto MCP

[ramonlimaramos]

Summary

• add CLAUDE_CODE_DISABLE_AUTO_MEMORY=1 when Synapto writes Claude Code MCP config
• add synapto configure-mcp so existing Claude Code users can upgrade their MCP config in place after release
• preserve existing Synapto MCP command/args during upgrades while adding the Claude-only env var
• keep Cursor MCP config free of the Claude-specific env var
• align generated new configs with the documented uvx --refresh synapto serve pattern
• document the upgrade path in README and Claude Code docs

Release plan

• Target: v0.5.0 source-of-truth / governed context layer
• Closes [claude_experience] disable claude code auto-memory when synapto is active #18

Rollout note

Existing users need to run the upgrade command once after installing the release, then restart Claude Code so the MCP subprocess receives the new environment:

uvx --refresh synapto configure-mcp --client claude-code --yes

Validation

• git diff --check
• uv run pytest tests/unit/test_cli.py -q (16 passed)
• uv run ruff check src/ tests/
• manual temp-home validation of synapto configure-mcp --client claude-code --yes
• GitHub CI run 27514326881: lint, security, test 3.11, test 3.12, test 3.13 all passed