deploy: create Codeberg issue when deploy fails and main is unchanged

If the last deploy failed and origin/main has not advanced, opens a
Prio/High + State/Ready issue via tea with the failing SHA, commit link,
and captured deploy output. Skips duplicate issues (tracked by
.last_issue_sha). Cron interval changed to */5.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

deploy.sh

@@ -8,7 +8,8 @@ set -a
 source "$REPO_DIR/.env"
 set +a
 
-# Add task and dagger from nix store if not already in PATH
+# Add nix profile and nix store tools (task, dagger) to PATH
+export PATH="$HOME/.nix-profile/bin:$PATH"
 for pkg in "*go-task-*/bin/task" "*dagger-*/bin/dagger"; do
     bin=$(ls -d /nix/store/$pkg 2>/dev/null | sort -V | tail -1)
     [ -n "$bin" ] && export PATH="$(dirname "$bin"):$PATH"