Add context-aware tag suggestion to MCP server

[miratcan]

Enable automatic project-based tag suggestions for LLM assistants via MCP.

Problem

• LLMs don't know which tags to use
• Manual tagging every time is tedious
• Want automatic project detection

Solution

Add suggest_kaydet_tags() tool to MCP server that:

1. Check for explicit override

Look for .kaydet.tags file in current directory

# .kaydet.tags
work
project-name

2. Smart default fallback

Use directory name as tag suggestion

# In /code/bbrain/ → suggest #bbrain
# In /projects/kaydet/ → suggest #kaydet

3. Return suggestion (not forcing)

{
  "suggested_tags": ["bbrain"],
  "source": "directory_name"
}

Benefits

• Zero-config automatic tagging
• LLM decides whether to use suggestion
• No modification to kaydet binary
• Per-project customization via .kaydet.tags

Implementation Notes

• Add tool to kaydet MCP server
• Document in MCP README
• LLM system prompt should mention this tool