Add programmer detection and filtering system

[konard]

Summary

Implements automatic detection and filtering of programmers vs non-programmers among friends, as requested in issue #22.

What it does

The system automatically:

1. Loads private message history for each friend (using existing messages cache)
2. Analyzes messages for programming-related content:
   • Programming languages (JavaScript, Python, Java, C++, etc.)
   • Technologies and frameworks (React, Node.js, Django, Docker, etc.)
   • Development terms (git, commit, deploy, bug, debug, etc.)
   • Code patterns (functions, variables, imports, etc.)
3. Detects programmers based on keywords and code patterns
4. Asks directly if no clear indication is found
5. Maintains a safe list of confirmed programmers

Key Features

• Automatic Detection: Analyzes message history with 70+ programming keywords and code pattern recognition
• Safe List Protection: Programmers won't be deleted unless blocked/deactivated
• Gradual Processing: Checks 5 friends per run, every 45 minutes
• Persistent Storage: Programmer status cached for 1 year
• Confidence Scoring: Detection includes confidence percentage
• Multiple Languages: Supports Russian and English keywords

Files Added/Modified

New Files:

• detect-programmer.js - Core detection logic with keyword and pattern matching
• programmer-status-cache.js - Persistent storage for programmer status
• triggers/filter-programmers.js - Periodic trigger to check and classify friends
• __tests__/detect-programmer.test.js - Comprehensive test suite (18 test cases)
• experiments/test-programmer-detection.js - Test script for manual verification
• experiments/view-programmer-statuses.js - View all programmer statuses

Modified Files:

• index.js - Integrated filter-programmers trigger (runs every 45 min)
• triggers/delete-deactivated-friends.js - Respects programmer safe list

How It Works

1. FilterProgrammers Trigger runs every 45 minutes
2. For each friend that hasn't been checked:
   • Loads message history from cache
   • Runs detection algorithm
   • If programmer detected (≥3 matches or 5% match ratio):
     • Marks as programmer with confidence score
     • Adds to safe list
   • If no clear indication:
     • Sends polite question asking if they're a programmer
     • Marks as "asked" (awaiting response)
3. Safe list protects confirmed programmers from deletion

Detection Algorithm

• Keywords: 70+ programming-related terms (languages, frameworks, tools)
• Code Patterns: 13 regex patterns for code detection
• Confidence Score: Calculated from match ratio and total matches
• Threshold: 3+ matches OR 5%+ of messages contain programming content

Test Results

PASS __tests__/detect-programmer.test.js
  ✓ 18 test cases passed
  ✓ Detects programmers from keywords (Russian and English)
  ✓ Detects programmers from code patterns
  ✓ Detects programmers from technology mentions
  ✓ Correctly rejects non-programmers
  ✓ Handles edge cases (empty, null, mixed messages)

Usage Examples

Test detection on a specific friend:

node experiments/test-programmer-detection.js [friendId]

View all programmer statuses:

node experiments/view-programmer-statuses.js

View specific friend status:

node experiments/view-programmer-statuses.js [friendId]

Data Storage

Programmer statuses are stored in:

• data/friends/programmer-status.json
• TTL: 1 year
• Format: { friendId: { isProgrammer, confidence, method, checkedAt, askedAt } }

Protection Mechanism

The delete-deactivated-friends trigger now checks programmer status before deletion:

• ✅ Deactivated non-programmers: Deleted as before
• ❌ Deactivated programmers: Protected (skipped from deletion)
• ✅ Priority friends: Protected as before

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Fixes #22

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