Generalize process-to-session mapping for CLI agent adapters

[codeaholicguy]

Summary

• Extract shared process detection, session matching, and agent naming into reusable utilities (utils/process.ts, utils/session.ts, utils/matching.ts) so no adapter calls execSync directly
• Refactor ClaudeCodeAdapter and CodexAdapter to use shared utilities while keeping adapter-specific logic (session dir scanning, JSONL parsing, status determination)
• Implement 1:1 greedy matching algorithm that pairs processes to sessions by CWD match + closest birthtime-to-start-time delta (3min tolerance)

Motivation

Both adapters duplicated ~70% of their logic: process discovery via ps aux, CWD lookup via lsof, start time calculation, session scanning, multi-pass matching, and agent naming. Adding a new CLI agent required rewriting all of this. Shell calls were scattered inside each adapter and not batched.