feat(plan-01): Phase 1 — relocate harness code to packages/casan-harness (symlink facade)

Physically move the pure-code subtrees out of .specify into the package, leaving
compat symlinks at the old .specify/<dir> paths so every existing reference (internal
CASAN_HARNESS_ROOT + external CI/docker/mjs) keeps resolving. Runtime state stays put.

Moved (git mv): scripts/ tests/ security/ templates/ config/ governance/ memory/
  .specify/<dir>  ->  packages/casan-harness/<dir>   (+ .specify/<dir> symlink)
Stays in .specify (state/governance/domain, handled later): logs/ agentops/ level5/
  init-options.json traceability-map.json

Python `.resolve()` self-location followed the compat symlink into packages and lost
the app root; generate-casan-demo-context.py, generate-agentops-dashboard.py and
dashboard-server.py now walk UP for the `.specify` state marker instead of a fixed
parent depth (fixes "missing trace files" in run-casan4).

Full gate: PASS=64 FAIL=0 SKIP=3 (CASAN_CI_STEP_TIMEOUT_SEC=1200 — track-a ~450s runs
close to the 600s default and can tip over under load; this is timing variance, not a
regression — it passed cleanly with headroom). Runtime log/audit artifacts kept unstaged.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

AINative_OKR_CASAN5/packages/casan-harness/scripts/bash/sandbox-container.sh

@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+set -uo pipefail
+
+# CASAN Track C — TRUE runtime isolation via container (C6 / V22, production form).
+#
+# Upgrades the static-policy scaffold (sandbox-run.sh) to real kernel isolation:
+# the command runs inside a locked-down container where the KERNEL — not a grep —
+# neutralises escapes:
+#   --network=none   → no egress at all
+#   --read-only      → root filesystem is immutable (can't write outside workspace)
+#   --pids-limit     → fork bombs are capped
+#   --memory/--cpus  → resource abuse is bounded
+#   -v <ws>:/work:rw → ONLY the workspace is writable; host $HOME/.ssh is NOT mounted
+#   --cap-drop=ALL --security-opt=no-new-privileges → no privilege escalation
+#
+# Usage:
+#   sandbox-container.sh --workspace <dir> [--image busybox] [--timeout 20]
+#                        [--memory 256m] [--pids 128] [--cpus 1] -- <command...>
+# Exit: command's exit code · 124 timeout · 2 policy/setup error · 127 no docker.
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+IMAGE="${CASAN_SANDBOX_IMAGE:-busybox}"
+WORKSPACE="$PWD"; TIMEOUT="${CASAN_SANDBOX_TIMEOUT:-20}"
+MEMORY="${CASAN_SANDBOX_MEMORY:-256m}"; PIDS="${CASAN_SANDBOX_PIDS:-128}"; CPUS="${CASAN_SANDBOX_CPUS:-1}"
+while [[ "$#" -gt 0 ]]; do
+  case "$1" in
+    --workspace) WORKSPACE="${2:-}"; shift 2 ;;
+    --image) IMAGE="${2:-}"; shift 2 ;;
+    --timeout) TIMEOUT="${2:-}"; shift 2 ;;
+    --memory) MEMORY="${2:-}"; shift 2 ;;
+    --pids) PIDS="${2:-}"; shift 2 ;;
+    --cpus) CPUS="${2:-}"; shift 2 ;;
+    --) shift; break ;;
+    *) echo "sandbox-container: unknown arg $1" >&2; exit 2 ;;
+  esac
+done
+[[ "$#" -ge 1 ]] || { echo "Usage: sandbox-container.sh --workspace <dir> -- <command...>" >&2; exit 2; }
+
+command -v docker >/dev/null 2>&1 || { echo "SANDBOX_CONTAINER_NO_DOCKER" >&2; exit 127; }
+docker info >/dev/null 2>&1 || { echo "SANDBOX_CONTAINER_DOCKER_DOWN" >&2; exit 127; }
+
+WS_ABS="$(cd "$WORKSPACE" 2>/dev/null && pwd)" || { echo "SANDBOX_CONTAINER_BAD_WORKSPACE" >&2; exit 2; }
+
+# Join the command into a single shell string to run inside the container.
+CMD="$*"
+
+# Hardened container. --init reaps zombies; tmpfs gives a small writable /tmp
+# without a writable rootfs. The wall-clock timeout goes through tool-exec.sh
+# (portable: `timeout` if present, else a perl alarm — macOS has no coreutils
+# `timeout`). Container name is tracked so a timed-out container is force-removed.
+CID="casan-sbx-$$-${RANDOM}"
+set +e
+bash "$SCRIPT_DIR/tool-exec.sh" "$TIMEOUT" -- \
+  docker run --rm --init --name "$CID" \
+    --network=none --read-only \
+    --pids-limit="$PIDS" --memory="$MEMORY" --cpus="$CPUS" \
+    --cap-drop=ALL --security-opt=no-new-privileges \
+    --tmpfs /tmp:rw,size=16m \
+    -v "$WS_ABS":/work:rw -w /work \
+    "$IMAGE" sh -c "$CMD"
+rc=$?
+set -e
+if [[ "$rc" -eq 124 ]]; then
+  docker rm -f "$CID" >/dev/null 2>&1 || true
+  echo "SANDBOX_CONTAINER_TIMEOUT after ${TIMEOUT}s" >&2
+  exit 124
+fi
+exit "$rc"