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-sec14-tests.sh

@@ -0,0 +1,72 @@
+#!/usr/bin/env bash
+set -uo pipefail
+
+# CASAN Plan-16 SEC-14 (M-03 / SC-03) — model-digest env-override is NOT trusted
+# in enforced mode.
+#
+# current_digest() honored CASAN_MODEL_DIGEST unconditionally, so an attacker who
+# swapped the local model could also set CASAN_MODEL_DIGEST to the pinned value
+# and pass verification. Under CASAN_PROFILE=prod (or CASAN_MODEL_DIGEST_STRICT=1)
+# the override is ignored and the digest must come from the live model backend.
+# This proves:
+#   * dev/CI: override still honored (pin + verify deterministic) — regression,
+#   * dev/CI: a swapped override is a MISMATCH (control still works),
+#   * prod: a forged override equal to the pin is NOT accepted (fail-closed),
+#   * strict flag: same enforced behavior without a full prod profile.
+#
+# Deterministic; hermetic (temp pin file; live backend pointed at a dead port).
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/../scripts/bash/casan-paths.sh"
+PROJECT_ROOT="$CASAN_APP_ROOT"
+MDC="$CASAN_HARNESS_ROOT/scripts/bash/model-digest-check.sh"
+WORK="$(mktemp -d)"
+trap 'rm -rf "$WORK"' EXIT
+
+PIN="$WORK/model-digest.pin"
+DEAD_OLLAMA="127.0.0.1:1"   # unreachable → live digest fetch fails deterministically
+
+PASS=0; FAIL=0
+pass() { echo "PASS: $1"; PASS=$((PASS + 1)); }
+fail() { echo "FAIL: $1"; FAIL=$((FAIL + 1)); }
+
+echo "===== Plan-16 SEC-14: model-digest env-override not trusted in enforced mode ====="
+
+# Setup: pin an approved digest in dev mode (override honored).
+CASAN_MODEL_DIGEST_PIN="$PIN" CASAN_MODEL_DIGEST="digest-approved" \
+  bash "$MDC" pin ornith:9b >/dev/null 2>&1
+
+# 1) dev/CI regression: matching override verifies OK.
+rc=$(set +e; CASAN_MODEL_DIGEST_PIN="$PIN" CASAN_MODEL_DIGEST="digest-approved" \
+  bash "$MDC" verify ornith:9b >/dev/null 2>&1; echo $?)
+[[ "$rc" -eq 0 ]] && pass "dev: matching override verifies OK (regression)" \
+  || fail "dev: matching override should verify OK (rc=$rc)"
+
+# 2) dev/CI regression: swapped override is a MISMATCH (block).
+rc=$(set +e; CASAN_MODEL_DIGEST_PIN="$PIN" CASAN_MODEL_DIGEST="digest-swapped" \
+  bash "$MDC" verify ornith:9b >/dev/null 2>&1; echo $?)
+[[ "$rc" -eq 2 ]] && pass "dev: swapped override detected as MISMATCH (rc=2)" \
+  || fail "dev: swapped override should MISMATCH (rc=$rc)"
+
+# 3) SEC-14 core (prod): a FORGED override equal to the pin must NOT be accepted.
+#    Override is ignored; live backend is unreachable → cannot verify (rc=3), never OK.
+err="$WORK/prod.err"
+rc=$(set +e; CASAN_PROFILE=prod OLLAMA_HOST="$DEAD_OLLAMA" \
+  CASAN_MODEL_DIGEST_PIN="$PIN" CASAN_MODEL_DIGEST="digest-approved" \
+  bash "$MDC" verify ornith:9b >/dev/null 2>"$err"; echo $?)
+[[ "$rc" -ne 0 ]] && pass "prod: forged override not accepted as OK (rc=$rc)" \
+  || fail "prod: forged override was accepted (rc=0) — env override still trusted"
+grep -q "MODEL_DIGEST_OVERRIDE_IGNORED" "$err" \
+  && pass "prod: override explicitly ignored (MODEL_DIGEST_OVERRIDE_IGNORED)" \
+  || fail "prod: override was not ignored (no OVERRIDE_IGNORED marker)"
+
+# 4) strict flag: same enforced behavior without a full prod profile.
+rc=$(set +e; CASAN_MODEL_DIGEST_STRICT=1 OLLAMA_HOST="$DEAD_OLLAMA" \
+  CASAN_MODEL_DIGEST_PIN="$PIN" CASAN_MODEL_DIGEST="digest-approved" \
+  bash "$MDC" verify ornith:9b >/dev/null 2>&1; echo $?)
+[[ "$rc" -ne 0 ]] && pass "strict: forged override not accepted (rc=$rc)" \
+  || fail "strict: forged override accepted (rc=0)"
+
+echo ""
+echo "===== SEC-14 SUMMARY: PASS=$PASS FAIL=$FAIL ====="
+[[ "$FAIL" -eq 0 ]] || exit 1