feat: add Codex plugin support with hooks, commands, and documentation

.codex-plugin/hooks/mempal-precompact-hook.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -euo pipefail
+PLUGIN_ROOT="${CODEX_PLUGIN_ROOT:-$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)}"
+
+# Capture stdin (hook input from Codex)
+INPUT_FILE=$(mktemp 2>/dev/null || echo "/tmp/mempal-precompact-hook-$$.json")
+cat > "$INPUT_FILE"
+
+# Pipe to Python CLI with codex harness
+cat "$INPUT_FILE" | python3 -m mempalace hook run --hook precompact --harness codex
+EXIT_CODE=$?
+
+# Cleanup
+rm -f "$INPUT_FILE" 2>/dev/null
+exit $EXIT_CODE

.codex-plugin/hooks/mempal-session-start-hook.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -euo pipefail
+PLUGIN_ROOT="${CODEX_PLUGIN_ROOT:-$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)}"
+
+# Capture stdin (hook input from Codex)
+INPUT_FILE=$(mktemp 2>/dev/null || echo "/tmp/mempal-session-start-hook-$$.json")
+cat > "$INPUT_FILE"
+
+# Pipe to Python CLI with codex harness
+cat "$INPUT_FILE" | python3 -m mempalace hook run --hook session-start --harness codex
+EXIT_CODE=$?
+
+# Cleanup
+rm -f "$INPUT_FILE" 2>/dev/null
+exit $EXIT_CODE

.codex-plugin/hooks/mempal-stop-hook.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -euo pipefail
+PLUGIN_ROOT="${CODEX_PLUGIN_ROOT:-$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)}"
+
+# Capture stdin (hook input from Codex)
+INPUT_FILE=$(mktemp 2>/dev/null || echo "/tmp/mempal-stop-hook-$$.json")
+cat > "$INPUT_FILE"
+
+# Pipe to Python CLI with codex harness
+cat "$INPUT_FILE" | python3 -m mempalace hook run --hook stop --harness codex
+EXIT_CODE=$?
+
+# Cleanup
+rm -f "$INPUT_FILE" 2>/dev/null
+exit $EXIT_CODE