fix: feat: SessionStart compact hook re-injects phase protocol after context compaction (#274)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

lib/hooks/on-compact-reinject.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+# on-compact-reinject.sh — SessionStart (compact) hook for dark-factory agent sessions.
+#
+# Called by Claude Code after context compaction. Reads a context file and
+# outputs its content to stdout, which Claude Code injects as system context.
+# No-op if the context file doesn't exist.
+#
+# Usage (in .claude/settings.json):
+#   {"type": "command", "command": "this-script /tmp/dev-session-PROJECT-ISSUE.context"}
+#
+# Args: $1 = context file path
+
+cat > /dev/null  # consume hook JSON from stdin
+[ -n "${1:-}" ] && [ -f "$1" ] && cat "$1"
+exit 0