docs: add Session 7 competitive analysis to AMELIORATIONS.md (#387)

Add comprehensive analysis of competitor features discovered:

Claude Code:
- JSON-RPC streaming input format
- Permission mode flag
- Strict MCP config flag
- Setting sources control
- No session persistence flag

Droid (Factory):
- Stream output formats (JSON-RPC)
- Delegation URL for Slack/Linear
- Spec model override
- Reasoning effort levels
- Decoupled modes and autonomy
- Completion sounds

OpenCode:
- Zen optimized models
- LSP auto-loading
- GitHub Copilot login
- ChatGPT Plus/Pro login
- Multi-session parallel
- Share links

Codex:
- Explorer role for multi-agent
- User shell snapshot
- Improved token estimation
- GitHub/Linear integration
- Thread/unarchive RPC

Updated statistics showing 44 critical gaps, 65 important gaps, and
94+ useful gaps to close with Cortex-CLI.

Co-authored-by: Droid Agent <droid@factory.ai>

Author: echobt