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/scripts/bash/artifact-scan.sh

@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+set -uo pipefail
+
+# CASAN WP-S7 — Artifact indirect injection scanner.
+# Before a sub-agent reads an artifact (spec, plan, context YAML, etc.),
+# this script scans its content for prompt-injection patterns.
+# Untrusted content sourced from external systems or user-supplied inputs
+# could carry injections that target downstream model calls.
+#
+# Usage:
+#   artifact-scan.sh <artifact-file> [context-label]
+#
+# Exit:
+#   0  — artifact is safe to use
+#   2  — injection pattern detected in artifact (pipeline should reject/quarantine)
+#   64 — usage error (file missing)
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+ARTIFACT="${1:-}"
+LABEL="${2:-unknown-artifact}"
+
+if [[ -z "$ARTIFACT" || ! -f "$ARTIFACT" ]]; then
+  echo "Usage: artifact-scan.sh <artifact-file> [context-label]" >&2
+  exit 64
+fi
+
+WORK="$(mktemp -d)"; trap 'rm -rf "$WORK"' EXIT
+SCAN_OUT="$WORK/artifact-scan-out.txt"
+
+# Run security-check.sh in 'input' mode on the artifact — this covers
+# blocklist + normalization + semantic (if CASAN_SEMANTIC_CLASSIFY=1).
+# We force semantic OFF here so the scan is fast; the caller can enable
+# it for high-risk artifacts.
+CASAN_SEMANTIC_CLASSIFY="${CASAN_SEMANTIC_CLASSIFY:-0}" \
+  bash "$SCRIPT_DIR/security-check.sh" "$ARTIFACT" "$SCAN_OUT" input 2>/dev/null
+SC_RC=$?
+
+TIMESTAMP="$(date -u +"%Y-%m-%dT%H:%M:%SZ")"
+
+if [[ "$SC_RC" -eq 2 ]]; then
+  echo "ARTIFACT_SCAN_BLOCKED label=$LABEL file=$ARTIFACT reason=injection_detected timestamp=$TIMESTAMP"
+  exit 2
+elif [[ "$SC_RC" -ne 0 ]]; then
+  echo "ARTIFACT_SCAN_ERROR label=$LABEL rc=$SC_RC" >&2
+  exit 2  # fail closed on scan error
+else
+  echo "ARTIFACT_SCAN_CLEAN label=$LABEL file=$ARTIFACT timestamp=$TIMESTAMP"
+  exit 0
+fi