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/security/output-policy.yaml

@@ -0,0 +1,48 @@
+version: 1.0
+description: CASAN H4 output filtering and data leakage prevention policy
+
+default_action: allow
+
+filters:
+  - id: OUT-SECRET-001
+    name: Secret material must never leave the harness
+    match:
+      regex: "(API[_-]?KEY|ACCESS[_-]?TOKEN|REFRESH[_-]?TOKEN|PASSWORD|JWT[_-]?SECRET|SECRET)[[:space:]]*[:=][[:space:]]*[^[:space:]]+"
+    action: redact
+    replacement: "[REDACTED_SECRET]"
+    severity: high
+
+  - id: OUT-PII-EMAIL
+    name: Email masking
+    match:
+      regex: "[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"
+    action: mask
+    replacement: "***MASKED_EMAIL***"
+    severity: medium
+
+  - id: OUT-PII-PHONE
+    name: Phone masking
+    match:
+      regex: "(\\+?[0-9][0-9 .-]{8,}[0-9])"
+    action: mask
+    replacement: "***MASKED_PHONE***"
+    severity: medium
+
+  - id: OUT-HALLUCINATION-RISK
+    name: Uncertainty language marker
+    match:
+      regex: "(maybe|might be incorrect|i am not sure|uncertain)"
+    action: flag
+    severity: low
+
+evidence:
+  trace_dir: ".specify/logs/trace"
+  audit_log: ".specify/logs/audit/security.jsonl"
+
+level4_gate:
+  required: true
+  fail_on:
+    - unredacted_secret
+    - credit_card_output
+    - blocked_prompt_injection
+  report_in: "docs/output/casan/casan-level4-assessment.md"