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/validate-tool-input.sh

@@ -0,0 +1,71 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# CASAN H2 tool-input validation.
+# Validates a tool-call input JSON against a JSON-Schema-style spec
+# (required fields + property types + additionalProperties:false).
+# Stdlib-only — supports type, required, properties, additionalProperties,
+# enum. NOT a full JSON Schema engine (no $ref, no nested object recursion
+# beyond one level); scoped deliberately and labeled as such.
+#
+# Usage: validate-tool-input.sh <schema.json> <input.json>
+# Exit: 0 valid, 2 invalid, 64 usage error.
+
+SCHEMA="${1:-}"
+INPUT="${2:-}"
+if [[ -z "$SCHEMA" || -z "$INPUT" || ! -f "$SCHEMA" || ! -f "$INPUT" ]]; then
+  echo "Usage: validate-tool-input.sh <schema.json> <input.json>" >&2
+  exit 64
+fi
+
+python - "$SCHEMA" "$INPUT" <<'PY'
+import json, sys
+
+schema = json.load(open(sys.argv[1], encoding="utf-8"))
+data = json.load(open(sys.argv[2], encoding="utf-8"))
+
+TYPES = {
+    "string": str, "integer": int, "number": (int, float),
+    "boolean": bool, "object": dict, "array": list,
+}
+errors = []
+
+
+# SEC-15: validate RECURSIVELY. Previously only the top level was checked, so a
+# nested object could smuggle wrong types / unexpected fields past the gate.
+def validate(schema, data, path):
+    expected = schema.get("type")
+    py = TYPES.get(expected)
+    if py and (not isinstance(data, py)
+               or (expected in ("integer", "number") and isinstance(data, bool))):
+        errors.append(f"{path or 'root'}: expected {expected}")
+        return
+    if "enum" in schema and data not in schema["enum"]:
+        errors.append(f"{path or 'root'}: not in enum {schema['enum']}")
+
+    if expected == "object" and isinstance(data, dict):
+        props = schema.get("properties", {})
+        for field in schema.get("required", []):
+            if field not in data:
+                errors.append(f"{path or 'root'}: missing required field: {field}")
+        if schema.get("additionalProperties") is False:
+            for key in data:
+                if key not in props:
+                    errors.append(f"{path or 'root'}: unexpected field: {key}")
+        for key, spec in props.items():
+            if key in data:
+                validate(spec, data[key], f"{path}.{key}" if path else key)
+    elif expected == "array" and isinstance(data, list):
+        item_spec = schema.get("items")
+        if isinstance(item_spec, dict):
+            for i, item in enumerate(data):
+                validate(item_spec, item, f"{path}[{i}]")
+
+
+validate(schema, data, "")
+
+if errors:
+    sys.stderr.write("TOOL_INPUT_INVALID " + "; ".join(errors) + "\n")
+    raise SystemExit(2)
+print("TOOL_INPUT_VALID")
+PY