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/tool-audit-lib.sh

@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+# Shared tamper-evident appender for the central tool-call audit log
+# (.specify/logs/audit/tool-calls.jsonl).
+#
+# Every record is chained: record_hash = SHA-256(previous_record_hash | core),
+# where core is the canonical (sorted-key) JSON of the record minus record_hash.
+# After each append the chain head is signed with the audit RSA key, so a
+# re-forged chain (recomputed hashes) cannot produce a valid head signature
+# without the private key. Used by both agent-metrics.sh and tool-registry-gate.sh
+# so the combined audit is tamper-evident regardless of which writer appended.
+#
+# Production note: the private key must live off-repo (KMS/HSM); it is local
+# here only for self-contained demonstration.
+
+append_tool_audit() {
+  local record_json="$1"
+  local project_root="$2"
+  local audit_dir="$CASAN_STATE_ROOT/logs/audit"
+  local log="$audit_dir/tool-calls.jsonl"
+  mkdir -p "$audit_dir"
+
+  local head
+  head="$(python - "$log" "$record_json" <<'PY'
+import hashlib, json, sys
+log, rec_json = sys.argv[1], sys.argv[2]
+rec = json.loads(rec_json)
+prev = ""
+try:
+    with open(log, encoding="utf-8") as f:
+        lines = [l for l in f if l.strip()]
+    if lines:
+        prev = json.loads(lines[-1]).get("record_hash", "")
+except FileNotFoundError:
+    pass
+rec.pop("record_hash", None)
+rec["previous_record_hash"] = prev
+core = json.dumps(rec, sort_keys=True, separators=(",", ":"))
+rec["record_hash"] = hashlib.sha256((prev + "|" + core).encode()).hexdigest()
+with open(log, "a", encoding="utf-8") as f:
+    f.write(json.dumps(rec) + "\n")
+sys.stdout.write(rec["record_hash"])
+PY
+)"
+
+  command -v openssl >/dev/null 2>&1 || return 0
+  # Private signing key lives OFF-REPO (default ~/.casan/audit-keys); only the
+  # public key is committed, for verification. Production: replace with KMS/HSM.
+  local pub_dir="$CASAN_GOVERNANCE_ROOT"
+  local priv_dir="${CASAN_AUDIT_KEY_DIR:-$HOME/.casan/audit-keys}"
+  local priv="$priv_dir/audit-private.pem" pub="$pub_dir/audit-public.pem"
+  mkdir -p "$pub_dir" "$priv_dir"
+  if [[ ! -f "$priv" ]]; then
+    openssl genpkey -algorithm RSA -pkeyopt rsa_keygen_bits:2048 -out "$priv" 2>/dev/null
+    chmod 600 "$priv"
+  fi
+  # Always re-export the matching public key so a persisted off-repo private key
+  # never drifts out of sync with a freshly checked-out audit-public.pem on CI
+  # runners (see governance-check.sh for the full rationale).
+  openssl rsa -in "$priv" -pubout -out "$pub" 2>/dev/null || true
+  printf '%s' "$head" > "$audit_dir/tool-calls-head.txt"
+  openssl dgst -sha256 -sign "$priv" -out "$audit_dir/tool-calls-head.sig" "$audit_dir/tool-calls-head.txt" 2>/dev/null || true
+}