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/pii-mask.py

@@ -0,0 +1,85 @@
+#!/usr/bin/env python3
+"""CASAN H4 PII masker driven by packages/casan-harness/security/pii-rules.yaml.
+
+Reads content on stdin, applies every `action: mask` rule from the rules
+file, and writes the masked content to stdout. Type-specific replacement
+tokens are preserved so downstream evidence stays stable
+(***MASKED_EMAIL***, ***MASKED_PHONE***, ***MASKED_ID***).
+
+This makes pii-rules.yaml the source of truth for PII masking instead of
+dead config: editing/removing a rule changes runtime behavior.
+"""
+import re
+import sys
+
+REPLACEMENT_BY_TYPE = {
+    "email": "***MASKED_EMAIL***",
+    "phone": "***MASKED_PHONE***",
+    "personal_id": "***MASKED_ID***",
+    "address": "***MASKED_ADDRESS***",
+}
+
+
+def load_rules(path):
+    rules, cur = [], {}
+    with open(path, encoding="utf-8") as fh:
+        for raw in fh:
+            s = raw.strip()
+            m = re.match(r"-\s*id:\s*(\S+)", s)
+            if m:
+                if cur:
+                    rules.append(cur)
+                cur = {"id": m.group(1)}
+                continue
+            m = re.match(r'type:\s*"?([^"\s]+)"?', s)
+            if m:
+                cur["type"] = m.group(1)
+                continue
+            m = re.match(r'regex:\s*"(.*)"\s*$', s)
+            if m:
+                # YAML double-quoted: collapse \\ -> \ to recover the real regex.
+                cur["regex"] = m.group(1).replace("\\\\", "\\")
+                continue
+            m = re.match(r"action:\s*(\S+)", s)
+            if m:
+                cur["action"] = m.group(1)
+                continue
+    if cur:
+        rules.append(cur)
+    return rules
+
+
+def main():
+    data = sys.stdin.read()
+    # SEC-08 (M-06): FAIL CLOSED. Previously a missing rules file, an unreadable
+    # file, or a broken rule regex all emitted the RAW data — so a mask rule that
+    # failed to load silently leaked the PII it was meant to hide. Now any such
+    # condition emits NOTHING and exits non-zero: no unmasked content ever escapes.
+    if len(sys.argv) < 2:
+        sys.stderr.write("PII_MASK_FAIL no rules file provided (fail-closed)\n")
+        return 1
+    try:
+        rules = load_rules(sys.argv[1])
+    except OSError as exc:
+        sys.stderr.write(f"PII_MASK_FAIL rules file unreadable (fail-closed): {exc}\n")
+        return 1
+    # Pre-compile every mask rule; a broken regex is fatal (that PII type would
+    # otherwise pass through unmasked). Validate all BEFORE emitting anything.
+    compiled = []
+    for rule in rules:
+        if rule.get("action") != "mask" or "regex" not in rule:
+            continue
+        token = REPLACEMENT_BY_TYPE.get(rule.get("type", ""), "***MASKED***")
+        try:
+            compiled.append((re.compile(rule["regex"]), token))
+        except re.error as exc:
+            sys.stderr.write(f"PII_MASK_FAIL bad regex in rule {rule.get('id')} (fail-closed): {exc}\n")
+            return 1
+    for rx, token in compiled:
+        data = rx.sub(token, data)
+    sys.stdout.write(data)
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())