Publish Layerfault deep challenge LF-CH-MMETA-0015

CHALLENGE_ORACLE.json

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+{
+  "attack_surface": [
+    "media-metadata"
+  ],
+  "control_type": "positive",
+  "corpus_id": "LF-CH-MMETA-0015",
+  "difficulty": "adversarial",
+  "expected_decision": "BLOCK",
+  "ground_truth": "synthetic-generated",
+  "layerfault_rule_expectations": {
+    "candidate_rules": [],
+    "expected_rules": [],
+    "must_not_rules": []
+  },
+  "oracle_ids": [
+    "LF-ORACLE-MEDIA-UNICODE-OBFUSCATION"
+  ],
+  "related_cases": [],
+  "repo_name": "media-metadata-unicode-zero-width-marker",
+  "safe_fixture": true,
+  "schema": 2,
+  "severity": "high",
+  "techniques": [
+    "unicode-obfuscation",
+    "zero-width"
+  ],
+  "transformations": [
+    "unicode-obfuscation"
+  ]
+}

FIXTURE_LAYOUT.json

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+{
+  "artifacts": [
+    "preview.png"
+  ],
+  "family": "media",
+  "note": "All content is synthetic and inert. Do not treat this as a production model.",
+  "repo_name": "media-metadata-unicode-zero-width-marker"
+}

LAYERFAULT_CORPUS.json

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+{
+  "candidate_rules": [],
+  "challenge": {
+    "attack_surface": [
+      "media-metadata"
+    ],
+    "control_type": "positive",
+    "difficulty": "adversarial",
+    "expected_decision": "BLOCK",
+    "oracle_ids": [
+      "LF-ORACLE-MEDIA-UNICODE-OBFUSCATION"
+    ],
+    "related_cases": [],
+    "severity": "high",
+    "techniques": [
+      "unicode-obfuscation",
+      "zero-width"
+    ],
+    "transformations": [
+      "unicode-obfuscation"
+    ]
+  },
+  "corpus_id": "LF-CH-MMETA-0015",
+  "description": "Metadata marker is broken by zero-width Unicode characters.",
+  "expected_rules": [],
+  "generator": "challenges.generate_challenge",
+  "ground_truth": "synthetic-generated",
+  "must_not_rules": [],
+  "repo_name": "media-metadata-unicode-zero-width-marker",
+  "repo_type": "model",
+  "safe_fixture": true,
+  "safety": "inert/canary-only",
+  "schema": 1,
+  "validation": {
+    "kind": "verify-package",
+    "target": "."
+  }
+}

README.md

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+---
+license: apache-2.0
+tags:
+- layerfault
+- security-research
+- model-security
+- synthetic
+- adversarial-testing
+extra_gated_prompt: >-
+  This repository is a synthetic security-test artifact from the Layerfault
+  corpus. It intentionally contains adversarial characteristics (e.g.
+  suspicious pickle opcodes, executable-format smuggling, prompt-injection
+  strings) designed to exercise security scanner detection rules. It is
+  **not** a usable ML model and must never be loaded or executed outside an
+  isolated scanner-testing environment. By accepting, you confirm you
+  understand this repository is a test fixture, not production model
+  weights.
+extra_gated_button_content: I understand this is a security test fixture and accept the risk
+gated: auto
+---
+
+# media-metadata-unicode-zero-width-marker
+
+> **SECURITY TEST ARTIFACT: DO NOT USE AS A PRODUCTION MODEL**
+
+This repository is part of the Layerfault synthetic security corpus.
+It is deliberately constructed to contain security-relevant characteristics for scanner testing.
+
+**Corpus ID:** `LF-CH-MMETA-0015`
+
+## Purpose
+
+Metadata marker is broken by zero-width Unicode characters.
+
+## Direct expected Layerfault rules
+
+- None; this repository is a control/comparison input.
+
+## Candidate rules
+
+These are deliberately plausible targets that remain marked as candidates until the exact
+Layerfault build used for certification confirms them.
+
+- None
+
+## Negative-control rules
+
+These should remain silent for this corpus item.
+
+- None
+
+## Safety
+
+The corpus uses fake secrets, loopback/`.invalid` network destinations, harmless marker output,
+and synthetic model behavior only. It is intended for static scanning and isolated security testing.
+
+## Challenge classification
+
+- Severity: **high**
+- Difficulty: **adversarial**
+- Expected admission decision: **BLOCK**
+- Control type: **positive**
+- Attack surface: media-metadata
+- Techniques: unicode-obfuscation, zero-width
+- Transformations: unicode-obfuscation
+
+### Ground-truth oracle IDs
+
+- `LF-ORACLE-MEDIA-UNICODE-OBFUSCATION`
+
+These oracle IDs describe synthetic ground truth. They do not claim that a
+matching Layerfault detector already exists. A challenge may intentionally expose
+a scanner blind spot and remain unmapped until the detector is implemented.

SHA256SUMS.json

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+[
+  {
+    "path": "CHALLENGE_ORACLE.json",
+    "sha256": "94121c1f1565b46a9d64af9da175801afade769f6e33bc0722e8231c32c50fe2",
+    "size": 668
+  },
+  {
+    "path": "FIXTURE_LAYOUT.json",
+    "sha256": "44c456ff89e769a83b29f374f181e5372188aec3751f054626dac63afa666ade",
+    "size": 213
+  },
+  {
+    "path": "LAYERFAULT_CORPUS.json",
+    "sha256": "c8d6ca0252422391fd26abee9bee5adc8c000de252e39ee49e3c6d83aa1cb989",
+    "size": 935
+  },
+  {
+    "path": "README.md",
+    "sha256": "a0030c7024181a10725f6470e23997345c7f54326b5551bf45a5c4c02ba6c6b4",
+    "size": 2282
+  },
+  {
+    "path": "preview.png",
+    "sha256": "58e81b5cfb38ad96ac85a40e7e12823d62552f8b196763a58641d6432373d734",
+    "size": 1185
+  }
+]