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-sec08-tests.sh

@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+set -uo pipefail
+
+# CASAN Plan-16 SEC-08 (M-06) — pii-mask fails CLOSED.
+#
+# Previously a missing rules file, an unreadable file, or a broken rule regex made
+# pii-mask emit the RAW stdin — silently leaking the very PII a mask rule was meant
+# to hide. Now any such condition emits NOTHING and exits non-zero. Normal masking
+# with valid rules is unchanged.
+#
+# Deterministic; hermetic; no model/network.
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/../scripts/bash/casan-paths.sh"
+PROJECT_ROOT="$CASAN_APP_ROOT"
+PM="$CASAN_HARNESS_ROOT/scripts/bash/pii-mask.py"
+RULES="$CASAN_HARNESS_ROOT/security/pii-rules.yaml"
+WORK="$(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)); }
+
+echo "===== Plan-16 SEC-08: pii-mask fail-closed ====="
+
+# 1) Valid rules still mask (regression).
+OUT="$(printf 'contact bob@example.com now' | python3 "$PM" "$RULES" 2>/dev/null)"
+if [[ "$OUT" == *"MASKED"* && "$OUT" != *"bob@example.com"* ]]; then
+  pass "valid rules mask the email (no leak)"
+else
+  fail "valid masking broken (out='$OUT')"
+fi
+
+# 2) Missing rules file → no output, non-zero, and NO raw email leaks.
+set +e
+OUT="$(printf 'secret bob@example.com' | python3 "$PM" "$WORK/nope.yaml" 2>/dev/null)"; RC=$?
+set -e 2>/dev/null || true
+if [[ "$RC" -ne 0 && -z "$OUT" ]]; then
+  pass "missing rules file → empty output, non-zero (fail-closed)"
+else
+  fail "missing rules leaked (rc=$RC out='$OUT')"
+fi
+
+# 3) Broken regex → no output, non-zero (that PII type would otherwise leak).
+printf -- '- id: email\n  type: "email"\n  regex: "([unterminated"\n  action: mask\n' > "$WORK/bad.yaml"
+set +e
+OUT="$(printf 'secret bob@example.com' | python3 "$PM" "$WORK/bad.yaml" 2>/dev/null)"; RC=$?
+set -e 2>/dev/null || true
+if [[ "$RC" -ne 0 && -z "$OUT" ]]; then
+  pass "broken rule regex → empty output, non-zero (fail-closed)"
+else
+  fail "broken regex leaked (rc=$RC out='$OUT')"
+fi
+
+# 4) No rules argument at all → fail-closed.
+set +e
+OUT="$(printf 'secret bob@example.com' | python3 "$PM" 2>/dev/null)"; RC=$?
+set -e 2>/dev/null || true
+if [[ "$RC" -ne 0 && -z "$OUT" ]]; then
+  pass "no rules argument → empty output, non-zero (fail-closed)"
+else
+  fail "no-arg leaked (rc=$RC out='$OUT')"
+fi
+
+echo ""
+echo "===== SEC-08 SUMMARY: PASS=$PASS FAIL=$FAIL ====="
+[[ "$FAIL" -eq 0 ]] || exit 1