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/path-guard.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+set -uo pipefail
+
+# CASAN Plan-16 SEC-28 (X-04) — path-traversal / symlink guard.
+#
+# A tool that takes a file path as input/output can be pointed at an arbitrary
+# location via `..` or a symlink (e.g. a symlink named "input.txt" -> /etc/passwd),
+# reading or writing outside the workspace. This resolves the REAL path (following
+# every symlink) and refuses anything that escapes the allowed root.
+#
+# Usage:  path-guard.sh <path> [allowed-root]     (default root: repo workspace)
+# Exit:   0 inside the root, 1 outside / unresolvable.
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/../../.." && pwd)"
+
+TARGET="${1:-}"
+ROOT="${2:-$PROJECT_ROOT}"
+if [[ -z "$TARGET" ]]; then
+  echo "Usage: path-guard.sh <path> [allowed-root]" >&2
+  exit 64
+fi
+
+python3 - "$TARGET" "$ROOT" <<'PY'
+import os
+import sys
+
+target, root = sys.argv[1], sys.argv[2]
+# realpath resolves symlinks in every existing path component and normalizes "..";
+# for a not-yet-created leaf it resolves the existing parent chain.
+real_target = os.path.realpath(target)
+real_root = os.path.realpath(root)
+
+if real_target == real_root or real_target.startswith(real_root + os.sep):
+    print(f"PATH_OK {real_target}")
+    sys.exit(0)
+sys.stderr.write(f"PATH_ESCAPES_ROOT target={target} real={real_target} root={real_root}\n")
+sys.exit(1)
+PY