fix(dtach): wire resume menu into ~/.bashrc for non-login VS Code shells

VS Code Remote-SSH integrated terminals are non-login interactive shells:
they source ~/.bashrc but never ~/.profile, where the resume menu was wired
(login-scope, BDR-007). The auto-check therefore never fired in the user's
actual environment, even after install.sh.

Source dtach-router from bashrc-linux (every interactive shell) instead, and
turn install.sh's wire_dtach_profile() into unwire_dtach_profile(): it now
strips any stale ~/.profile block so a plain SSH login (which reads ~/.bashrc
via ~/.profile) does not prompt twice. README updated to match.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CN1KSmsuLG6TxSeN5m8xvM

bash/bashrc-linux

@@ -117,5 +117,10 @@ PROMPT_COMMAND='set_prompt'
 dtach_claude() { dtach -c "$HOME/.dtach/${1:-claude-$(date +%H%M%S)}" -e '^\' claude; }
 alias cc='dtach_claude'
 
-# Rappeler a la demande le menu de reprise (sinon il s'affiche seul au login SSH).
+# Rappeler a la demande le menu de reprise.
 alias d='source ~/.local/bin/dtach-router'
+
+# Au demarrage d'un shell interactif, proposer de reprendre une session dtach existante
+# (silencieux si aucune). Place ici plutot que dans ~/.profile car les terminaux VS Code
+# Remote-SSH sont non-login et ne lisent pas ~/.profile ; ~/.bashrc, lui, est toujours lu.
+case $- in *i*) [ -x "$HOME/.local/bin/dtach-router" ] && . "$HOME/.local/bin/dtach-router" ;; esac