refactor(structure): promote app to repo root + remove redundant workspace cruft

Standard production layout: the OKR app (was nested under AINative_OKR_CASAN5/) is now
the repository root. No more wrapper directory.

- Promote AINative_OKR_CASAN5/* -> repo root (backend/ frontend/ packages/ apps/
  .specify/ docs/ infra/ nginx/ scripts/ + configs). Merge tool dirs: .gitea (kept the
  active deploy ci.yml, added harness-ci.yml + runbooks), .claude (agents/commands +
  launch.json), .github moved up.
- Remove redundant: 00_SUBMISSION_PACKAGE, scattered root notes (FPT_CASAN_Full.md,
  tu-tuong-casan.md, casan-tu-sinh..., casan_harness_assessment.md, source-review...,
  README_CASAN5_REFINED.md), casan-next-plans/ and optimize-docs/ (competition/planning
  artifacts — roadmap + design history preserved in git log / commit messages).
- Update all references to the old layout:
  - .gitea/workflows/{ci,harness-ci}.yml, .github/workflows/{ci,deploy}.yml:
    working-directory .; drop AINative_OKR_CASAN5/ prefix; .specify/{tests,scripts}
    -> packages/casan-harness/... (.specify/logs state kept)
  - .claude/launch.json, .gitea/*-runbook.md: path prefixes
  - CLAUDE.md, README.md: docs/input -> apps/okr/domain/input
  - policy-bundle.yaml: 8 policy paths -> packages/casan-harness/...; manifest re-signed
- secrets-scan.sh: fixture excludes -> new package/domain paths.

Full gate from the new root: PASS=64 FAIL=0 SKIP=3.

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

packages/casan-harness/tests/phase-sec25-tests.sh

@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+set -uo pipefail
+
+# CASAN Plan-16 SEC-25 (SC-07, offline) — build-artifact attestation (tested==deployed).
+#
+# Proves (no network):
+#   * an artifact attested + verified passes (tested == deployed),
+#   * modifying the artifact after attestation -> MISMATCH (deployed != tested) REFUSED,
+#   * a forged attestation (signed by a different key) is REFUSED,
+#   * a missing or UNSIGNED attestation fails CLOSED.
+#
+# Deterministic; hermetic; uses openssl (skip-aware).
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/../scripts/bash/casan-paths.sh"
+PROJECT_ROOT="$CASAN_APP_ROOT"
+AA="$CASAN_HARNESS_ROOT/scripts/bash/artifact-attest.sh"
+WORK="$(mktemp -d)"
+trap 'rm -rf "$WORK"' EXIT
+
+PASS=0; FAIL=0
+pass() { echo "PASS: $1"; PASS=$((PASS + 1)); }
+fail() { echo "FAIL: $1"; FAIL=$((FAIL + 1)); }
+rc_of() { set +e; "$@" >/dev/null 2>&1; echo $?; set -e 2>/dev/null || true; }
+
+command -v openssl >/dev/null 2>&1 || { echo "SKIP: openssl unavailable"; exit 0; }
+
+echo "===== Plan-16 SEC-25: build-artifact attestation (offline) ====="
+
+openssl genrsa -out "$WORK/build.priv.pem" 2048 2>/dev/null
+openssl rsa -in "$WORK/build.priv.pem" -pubout -out "$WORK/build.pub.pem" 2>/dev/null
+openssl genrsa -out "$WORK/atk.priv.pem" 2048 2>/dev/null
+
+printf 'tested release artifact v1\n' > "$WORK/app.tar"
+
+# --- attest + verify -> OK ---
+bash "$AA" attest "$WORK/app.tar" "$WORK/build.priv.pem" >/dev/null 2>&1
+[[ "$(rc_of bash "$AA" verify "$WORK/app.tar" "$WORK/app.tar.att" "$WORK/build.pub.pem")" -eq 0 ]] \
+  && pass "attested artifact verifies (tested==deployed)" || fail "attested artifact rejected"
+
+# --- deployed != tested -> MISMATCH ---
+cp "$WORK/app.tar" "$WORK/app2.tar"
+bash "$AA" attest "$WORK/app2.tar" "$WORK/build.priv.pem" >/dev/null 2>&1
+printf 'SWAPPED malicious artifact\n' > "$WORK/app2.tar"   # different deploy than tested
+[[ "$(rc_of bash "$AA" verify "$WORK/app2.tar" "$WORK/app2.tar.att" "$WORK/build.pub.pem")" -eq 2 ]] \
+  && pass "swapped artifact (deployed!=tested) REFUSED" || fail "artifact swap not detected"
+
+# --- forged attestation (wrong key) -> REFUSED ---
+cp "$WORK/app.tar" "$WORK/app3.tar"
+bash "$AA" attest "$WORK/app3.tar" "$WORK/atk.priv.pem" >/dev/null 2>&1   # signed by attacker
+[[ "$(rc_of bash "$AA" verify "$WORK/app3.tar" "$WORK/app3.tar.att" "$WORK/build.pub.pem")" -eq 2 ]] \
+  && pass "forged attestation (wrong key) REFUSED" || fail "forged attestation accepted"
+
+# --- missing attestation -> fail-closed ---
+printf 'unattested\n' > "$WORK/app4.tar"
+[[ "$(rc_of bash "$AA" verify "$WORK/app4.tar" "$WORK/app4.tar.att" "$WORK/build.pub.pem")" -eq 3 ]] \
+  && pass "missing attestation fails CLOSED" || fail "missing attestation not refused"
+
+# --- unsigned attestation -> fail-closed ---
+cp "$WORK/app.tar" "$WORK/app5.tar"
+bash "$AA" attest "$WORK/app5.tar" "$WORK/build.priv.pem" >/dev/null 2>&1
+rm -f "$WORK/app5.tar.att.sig"   # strip signature
+[[ "$(rc_of bash "$AA" verify "$WORK/app5.tar" "$WORK/app5.tar.att" "$WORK/build.pub.pem")" -eq 3 ]] \
+  && pass "UNSIGNED attestation fails CLOSED" || fail "unsigned attestation not refused"
+
+echo ""
+echo "===== SEC-25 SUMMARY: PASS=$PASS FAIL=$FAIL ====="
+[[ "$FAIL" -eq 0 ]] || exit 1