Complete AI chat integration: fix build, enhance patch, add demo tools

[Copilot]

Completes the Plan 9 rc shell AI chat integration started in #1. Addresses build reliability, incomplete aichat patch, and missing user-facing tools.

Build System

• Auto-create parse.tab.h → parse.h symlink in Makefile (parse.c includes parse.tab.h but yacc outputs parse.h)
• Update .gitignore for build artifacts
• Clean builds now work without manual intervention

aichat Integration Patch

Enhanced from history-only to complete integration:

+++ b/src/utils/command.rs
@@ -75,6 +75,7 @@ impl Shell {
         let shell_arg = match name {
             "powershell" | "pwsh" => "-Command",
+            "rc" => "-c",  // Plan 9 rc shell
             "cmd" => "/C",

• Added shell detection logic in Shell::detect()
• Added -c argument mapping
• Included version info and apply instructions

User-Facing Tools

• demo-integration.sh - interactive demo showing shell detection, command execution, history management
• example.rcrc - ready-to-use configuration template
• BUILD.md - troubleshooting guide for common build issues
• CHANGES.md - comprehensive summary for end users

CI/CD

• Added integration test and demo execution to GitHub Actions
• Validates functionality on Ubuntu and macOS

Documentation

• Added troubleshooting section to AI_INTEGRATION.md
• Updated IMPLEMENTATION_SUMMARY.md with continuation details
• Cross-referenced build guide in README

Original prompt

continue implementation of ai chat rc shell integration

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[drzo]

coool