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/evidence-pack-verify.py

@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+"""CASAN Plan-09 — Evidence Pack verifier (MVP).
+
+Recomputes the hash of every file in a pack and compares it to the stored
+artifact-manifest.json. Any change to any packed file flips a hash and fails
+verification. (The bash wrapper additionally verifies the RSA signature over
+manifest-head.txt, which stops an attacker who rewrites the manifest too.)
+
+Argv: <pack_dir>
+Exit: 0 intact, 1 tamper detected / manifest missing.
+"""
+import hashlib
+import json
+import os
+import sys
+
+
+def main():
+    pack_dir = sys.argv[1]
+    manifest_path = os.path.join(pack_dir, "artifact-manifest.json")
+    if not os.path.isfile(manifest_path):
+        sys.stderr.write("EVIDENCE_PACK_NO_MANIFEST\n")
+        return 1
+    try:
+        manifest = json.load(open(manifest_path, encoding="utf-8"))
+    except ValueError:
+        sys.stderr.write("EVIDENCE_PACK_MANIFEST_CORRUPT\n")
+        return 1
+
+    stored = manifest.get("files", {})
+    mismatches = []
+
+    # Every file recorded in the manifest must still hash to the same value.
+    for fn, want in stored.items():
+        path = os.path.join(pack_dir, fn)
+        if not os.path.isfile(path):
+            mismatches.append(f"{fn}:missing")
+            continue
+        with open(path, "rb") as f:
+            got = hashlib.sha256(f.read()).hexdigest()
+        if got != want:
+            mismatches.append(f"{fn}:hash_changed")
+
+    # A new unmanifested file (except sig/head) is also tampering.
+    for fn in os.listdir(pack_dir):
+        if fn in ("artifact-manifest.json", "evidence-pack.sig", "manifest-head.txt"):
+            continue
+        if os.path.isfile(os.path.join(pack_dir, fn)) and fn not in stored:
+            mismatches.append(f"{fn}:unexpected_file")
+
+    # The stored manifest_head must match the recomputed head of `stored`.
+    canonical = json.dumps(stored, sort_keys=True, separators=(",", ":"))
+    head_now = hashlib.sha256(canonical.encode()).hexdigest()
+    if head_now != manifest.get("manifest_head"):
+        mismatches.append("manifest_head:mismatch")
+
+    if mismatches:
+        sys.stderr.write("EVIDENCE_PACK_TAMPERED " + " ".join(mismatches) + "\n")
+        return 1
+
+    cert = "unknown"
+    rs = os.path.join(pack_dir, "run-summary.json")
+    if os.path.isfile(rs):
+        try:
+            cert = str(json.load(open(rs, encoding="utf-8")).get("certified"))
+        except ValueError:
+            pass
+    print(f"EVIDENCE_PACK_INTACT files={len(stored)} certified={cert} head={head_now}")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())