docs: delete deprecated client specific readme

README_DL2.md

@@ -1,26 +0,0 @@
-# Series 3 Watcher — v1_0(py38-safe) for DL2
-
-**Target**: Windows 7 + Python 3.8.10  
-**Baseline**: v5_4 (no logic changes)
-
-## Files
-- series3_agent_v1_0_py38.py — main script (py38-safe)
-- config.ini — your config (already included)
-- series3_roster.csv — your roster (already included, this auto updates from a URL to a dropbox file)
-- requirements.txt — none beyond stdlib
-
-## Install
-1) Create `C:\SeismoEmitter\` on DL2
-2) Extract this ZIP into that folder
-3) Open CMD:
-   ```cmd
-   cd C:\SeismoEmitter
-   python series3_agent_v1_0_py38.py
-   ```
-(If the console shows escape codes on Win7, set `COLORIZE = False` in `config.ini`.)
-
-## Quick validation
-- Heartbeat prints Local/UTC timestamps
-- One line per active roster unit with OK/Pending/Missing, Age, Last, File
-- Unexpected units block shows .MLG not in roster
-- agent.log rotates per LOG_RETENTION_DAYS