diff --git a/FORK_PATCHES.md b/FORK_PATCHES.md
new file mode 100644
index 00000000..56547e12
--- /dev/null
+++ b/FORK_PATCHES.md
@@ -0,0 +1,98 @@
+# Fork-Only Patches — Manual Restore Checklist
+
+This fork (`XInfty/EverOS_Qdrant`) carries patches that do **not** exist upstream in `EverMind-AI/EverOS`. Upstream periodically renames or restructures the tree (most recently `methods/evermemos/` → `methods/EverCore/` around 2026-05-13). When that happens, custom files can silently disappear and custom edits inside renamed files can be reverted.
+
+Real incidents this list exists to prevent:
+
+- **2026-05-12** — 14 LLM call-sites had `response_format={"type":"json_object"}` patches; a model swap exposed that this isn't strict enough. Solution was migrating 13/15 sites to `response_format={"type":"json_schema", "strict": true}` with per-site schemas.
+- **2026-05-15** — `rerank_voyage.py` plus the corresponding factory branch in `rerank_service.py` disappeared during the rename. Retrieval went silently empty for three days (HTTP 200 + `episodes=[]`, not a hang) before being noticed. Restored in #7.
+
+## After every `git merge upstream/main`
+
+Run the checks below. If any fails, restore the patch before pushing.
+
+### 1. Voyage AI rerank provider
+
+- [ ] File `methods/EverCore/src/agentic_layer/rerank_voyage.py` exists (~252 LOC). Voyage returns `data: [{index, relevance_score}]`; this file normalises to the EverOS-standard `{results: [{index, score, rank}]}`.
+- [ ] `methods/EverCore/src/agentic_layer/rerank_service.py` contains a factory branch for `provider.lower() == "voyage"` between the `deepinfra` branch and the `else: raise RerankError`. Defaults `base_url` to `https://api.voyageai.com/v1/rerank` when env override is empty.
+
+Quick grep:
+
+```bash
+test -f methods/EverCore/src/agentic_layer/rerank_voyage.py \
+  && grep -q '"voyage"' methods/EverCore/src/agentic_layer/rerank_service.py \
+  && echo "voyage: OK" || echo "voyage: MISSING"
+```
+
+### 2. `timezone` import in episodic Qdrant repo
+
+- [ ] `methods/EverCore/src/infra_layer/adapters/out/search/repository/episodic_memory_qdrant_repository.py` line 15 reads `from datetime import datetime, timezone` (not just `datetime`). Required by `tz=timezone.utc` further down.
+
+Quick grep:
+
+```bash
+grep -q '^from datetime import datetime, timezone' \
+  methods/EverCore/src/infra_layer/adapters/out/search/repository/episodic_memory_qdrant_repository.py \
+  && echo "timezone: OK" || echo "timezone: MISSING"
+```
+
+### 3. Strict JSON-Schema response_format
+
+13 of 15 LLM call-sites should use `response_format={"type": "json_schema", "strict": True, "schema": {...}}` instead of `{"type": "json_object"}`. Per-site schema name in the second column:
+
+| File | Schema name |
+|---|---|
+| `methods/EverCore/src/memory_layer/memory_extractor/episode_memory_extractor.py:270` | `episode_memory` |
+| `methods/EverCore/src/memory_layer/memcell_extractor/conv_memcell_extractor.py:409` | `batch_boundary_result` |
+| `methods/EverCore/src/agentic_layer/agentic_utils.py:326` | `sufficiency_check` |
+| `methods/EverCore/src/agentic_layer/agentic_utils.py:403` | `multi_query_generation` |
+| `methods/EverCore/src/agentic_layer/search_mem_service.py:1618` | `skill_relevance` |
+| `methods/EverCore/src/memory_layer/cluster_manager/manager.py:658` | `cluster_assignment` |
+| `methods/EverCore/src/memory_layer/memory_extractor/agent_skill_extractor.py:301` | `skill_operations` |
+| `methods/EverCore/src/memory_layer/memory_extractor/agent_skill_extractor.py:330` | `skill_maturity` |
+| `methods/EverCore/src/memory_layer/memory_extractor/foresight_extractor.py:120` | `foresight_associations` (wrapped object, parser accepts both shapes) |
+| `methods/EverCore/src/memory_layer/memory_extractor/atomic_fact_extractor.py:190` | `atomic_facts_extraction` |
+| `methods/EverCore/src/memory_layer/memory_extractor/agent_case_extractor.py:394` | `filter_decision` |
+| `methods/EverCore/src/memory_layer/memory_extractor/agent_case_extractor.py:415` | `experience_record` |
+| `methods/EverCore/src/memory_layer/memory_extractor/profile_extractor.py` (2 sites, shared parser) | `_parse_profile_response` type-coercion (see §4) |
+
+Quick count:
+
+```bash
+grep -rE 'response_format.*json_schema' methods/EverCore/src/ | wc -l
+# expect: >= 13
+```
+
+### 4. Profile extractor — defense-in-depth coercion
+
+- [ ] `methods/EverCore/src/memory_layer/memory_extractor/profile_extractor.py` has post-parse coercion in `_parse_profile_response` that runs `json.dumps(...)` on non-string `description / trait / evidence / category` values before downstream code touches them. The profile output shape is too heterogeneous for strict schema; coercion catches LLM drift instead.
+
+Quick grep:
+
+```bash
+grep -q 'json.dumps' \
+  methods/EverCore/src/memory_layer/memory_extractor/profile_extractor.py \
+  && echo "profile coercion: OK" || echo "profile coercion: MISSING"
+```
+
+### 5. Intentional opt-outs (do NOT add strict schema)
+
+- `methods/EverCore/src/memory_layer/memory_extractor/agent_case_extractor.py:370` (`tool_pre_compress`) stays on `json_object`. The `compressed_messages` shape is heterogeneous (assistant + tool_calls vs tool message) and breaks strict schema. The caller validates `len(compressed_messages) == len(messages)` as a safety net.
+
+## Suggested CI guard
+
+A `.github/workflows/fork-patch-guard.yml` job that runs the four greps above on every PR and fails if any returns the wrong count. PR welcome.
+
+## How to update this file
+
+When a new patch is added that lives only in this fork:
+
+1. Add it to the relevant section above (or create a new one).
+2. Add a quick-grep snippet.
+3. Update `.github/workflows/fork-patch-guard.yml` if it exists.
+4. Reference the PR that introduced the patch.
+
+## Related history
+
+- PR #7 — Restored Voyage rerank + timezone import after the 2026-05-13 rename.
+- XInfty/XInfty_docs#2 — EWM Bug-Cluster doc update for 2026-05-15.
diff --git a/methods/EverCore/src/agentic_layer/rerank_service.py b/methods/EverCore/src/agentic_layer/rerank_service.py
index e668e8c2..e51fe4cf 100644
--- a/methods/EverCore/src/agentic_layer/rerank_service.py
+++ b/methods/EverCore/src/agentic_layer/rerank_service.py
@@ -30,6 +30,7 @@
 )
 from agentic_layer.rerank_vllm import VllmRerankService, VllmRerankConfig
 from agentic_layer.rerank_deepinfra import DeepInfraRerankService, DeepInfraRerankConfig
+from agentic_layer.rerank_voyage import VoyageRerankService, VoyageRerankConfig
 from agentic_layer.metrics.rerank_metrics import (
     record_rerank_request,
     record_rerank_fallback,
@@ -173,6 +174,17 @@ def _create_service_from_config(
             max_concurrent_requests=max_concurrent,
         )
         return DeepInfraRerankService(config)
+    elif provider.lower() == "voyage":
+        config = VoyageRerankConfig(
+            api_key=api_key,
+            base_url=base_url or 'https://api.voyageai.com/v1/rerank',
+            model=model,
+            timeout=timeout,
+            max_retries=max_retries,
+            batch_size=batch_size,
+            max_concurrent_requests=max_concurrent,
+        )
+        return VoyageRerankService(config)
     else:
         raise RerankError(f"Unsupported provider: {provider}")
 
diff --git a/methods/EverCore/src/agentic_layer/rerank_voyage.py b/methods/EverCore/src/agentic_layer/rerank_voyage.py
new file mode 100644
index 00000000..cd0cfdb3
--- /dev/null
+++ b/methods/EverCore/src/agentic_layer/rerank_voyage.py
@@ -0,0 +1,259 @@
+"""
+Voyage AI Rerank Service Implementation
+
+Reranking service using Voyage AI commercial API (rerank-2.5).
+
+Voyage's API differs from DeepInfra/vLLM in two ways:
+- POST to a fixed endpoint (no model-suffix path).
+- Request shape: ``{"query", "documents", "model"}`` with plain strings
+  (no Qwen ``<|im_start|>`` template wrapping).
+- Response shape: ``{"data": [{"index", "relevance_score"}], "usage": {...}}``
+  (DeepInfra/Cohere return ``results``; Voyage returns ``data``).
+
+The service normalises Voyage's response into the EverOS standard
+``{"results": [{"index", "score", "rank"}]}`` shape so callers don't care
+which backend produced the scores.
+"""
+
+import asyncio
+import aiohttp
+import logging
+from typing import List, Dict, Any, Optional
+from dataclasses import dataclass
+
+from agentic_layer.rerank_interface import (
+    RerankServiceInterface,
+    RerankError,
+    extract_text_from_hit,
+)
+from core.di.utils import get_bean_by_type
+from core.component.token_usage_collector import TokenUsageCollector
+
+logger = logging.getLogger(__name__)
+
+
+@dataclass
+class VoyageRerankConfig:
+    """Voyage rerank service configuration"""
+
+    api_key: str = ""  # skip-sensitive-check
+    base_url: str = "https://api.voyageai.com/v1/rerank"
+    model: str = "rerank-2.5"
+    timeout: int = 30
+    max_retries: int = 3
+    batch_size: int = 100  # Voyage accepts up to 1000 docs/request
+    max_concurrent_requests: int = 5
+
+
+class VoyageRerankService(RerankServiceInterface):
+    """Voyage AI reranking service implementation"""
+
+    def __init__(self, config: Optional[VoyageRerankConfig] = None):
+        if config is None:
+            config = VoyageRerankConfig()
+
+        self.config = config
+        self.session: Optional[aiohttp.ClientSession] = None
+        self._semaphore = asyncio.Semaphore(config.max_concurrent_requests)
+        self._session_lock = asyncio.Lock()
+        logger.info(
+            f"Initialized VoyageRerankService | url={config.base_url} | model={config.model}"
+        )
+
+    async def _ensure_session(self):
+        # Lock guards against concurrent first-touch creating multiple sessions
+        # and leaking the loser; the inner re-check covers the racy second waiter.
+        if self.session is not None and not self.session.closed:
+            return
+        async with self._session_lock:
+            if self.session is not None and not self.session.closed:
+                return
+            timeout = aiohttp.ClientTimeout(total=self.config.timeout)
+            self.session = aiohttp.ClientSession(
+                timeout=timeout,
+                headers={
+                    "Authorization": f"Bearer {self.config.api_key}",
+                    "Content-Type": "application/json",
+                },
+            )
+
+    async def close(self):
+        if self.session and not self.session.closed:
+            await self.session.close()
+
+    async def _send_rerank_request_batch(
+        self, query: str, documents: List[str]
+    ) -> Dict[str, Any]:
+        """POST one batch to the Voyage rerank endpoint."""
+        await self._ensure_session()
+
+        # Voyage expects plain strings, NOT Qwen-template wrapped.
+        request_data = {
+            "query": query,
+            "documents": documents,
+            "model": self.config.model,
+        }
+
+        async with self._semaphore:
+            for attempt in range(self.config.max_retries):
+                try:
+                    async with self.session.post(
+                        self.config.base_url, json=request_data
+                    ) as response:
+                        if response.status == 200:
+                            json_body = await response.json()
+                            return self._parse_response(json_body, len(documents))
+                        error_text = await response.text()
+                        logger.error(
+                            f"Voyage rerank API error {response.status}: {error_text}"
+                        )
+                        if attempt < self.config.max_retries - 1:
+                            await asyncio.sleep(2 ** attempt)
+                            continue
+                        raise RerankError(
+                            f"API failed: {response.status} - {error_text}"
+                        )
+                except RerankError:
+                    raise
+                except Exception as e:
+                    logger.error(f"Voyage rerank exception: {e}")
+                    if attempt < self.config.max_retries - 1:
+                        await asyncio.sleep(2 ** attempt)
+                        continue
+                    raise RerankError(f"Exception: {e}")
+
+    def _parse_response(
+        self, json_body: Dict[str, Any], num_docs: int
+    ) -> Dict[str, Any]:
+        """Voyage returns ``data: [{index, relevance_score}]`` — translate
+        into a dense ``scores`` array aligned to the request order."""
+        scores = [0.0] * num_docs
+        for item in json_body.get("data", []):
+            idx = item.get("index")
+            if idx is None or not (0 <= idx < num_docs):
+                continue
+            scores[idx] = float(item.get("relevance_score", 0.0))
+
+        usage = json_body.get("usage", {}) or {}
+        return {
+            "scores": scores,
+            "input_tokens": int(usage.get("total_tokens", 0) or 0),
+            "request_id": json_body.get("id"),
+        }
+
+    async def rerank_documents(
+        self, query: str, documents: List[str], instruction: Optional[str] = None
+    ) -> Dict[str, Any]:
+        """Low-level reranking; ``instruction`` is ignored — Voyage uses the
+        query/documents pair directly."""
+        if not documents:
+            return {"results": []}
+
+        batch_size = self.config.batch_size or 100
+        batches = [
+            documents[i : i + batch_size] for i in range(0, len(documents), batch_size)
+        ]
+
+        batch_tasks = [
+            self._send_rerank_request_batch(query, batch) for batch in batches
+        ]
+        batch_results = await asyncio.gather(*batch_tasks, return_exceptions=True)
+
+        all_scores: List[float] = []
+        total_input_tokens = 0
+        last_response = None
+
+        for i, result in enumerate(batch_results):
+            if isinstance(result, Exception):
+                logger.error(f"Voyage rerank batch {i} failed: {result}")
+                all_scores.extend([-100.0] * len(batches[i]))
+                continue
+            all_scores.extend(result.get("scores", []))
+            total_input_tokens += result.get("input_tokens", 0)
+            last_response = result
+
+        try:
+            collector = get_bean_by_type(TokenUsageCollector)
+            collector.add(self.config.model, total_input_tokens, 0, call_type="rerank")
+        except Exception:
+            pass
+
+        combined_response = {
+            "scores": all_scores,
+            "input_tokens": total_input_tokens,
+            "request_id": last_response.get("request_id") if last_response else None,
+        }
+        return self._convert_response_format(combined_response, len(documents))
+
+    def _convert_response_format(
+        self, combined_response: Dict[str, Any], num_documents: int
+    ) -> Dict[str, Any]:
+        scores = combined_response.get("scores", [])
+        if len(scores) < num_documents:
+            scores.extend([0.0] * (num_documents - len(scores)))
+        scores = scores[:num_documents]
+
+        indexed_scores = [(i, score) for i, score in enumerate(scores)]
+        indexed_scores.sort(key=lambda x: x[1], reverse=True)
+
+        results = [
+            {"index": original_index, "score": score, "rank": rank}
+            for rank, (original_index, score) in enumerate(indexed_scores)
+        ]
+        return {
+            "results": results,
+            "input_tokens": combined_response.get("input_tokens", 0),
+            "request_id": combined_response.get("request_id"),
+        }
+
+    async def rerank_memories(
+        self,
+        query: str,
+        hits: List[Dict[str, Any]],
+        top_k: Optional[int] = None,
+        instruction: Optional[str] = None,
+    ) -> List[Dict[str, Any]]:
+        if not hits:
+            return []
+
+        all_texts = [extract_text_from_hit(hit) for hit in hits]
+        if not all_texts:
+            return []
+
+        try:
+            logger.debug(
+                f"Voyage reranking, query: {query!r}, num_texts={len(all_texts)}"
+            )
+            rerank_result = await self.rerank_documents(query, all_texts, instruction)
+            if "results" not in rerank_result:
+                raise RerankError("Invalid rerank API response: missing results field")
+
+            results_meta = rerank_result.get("results", [])
+            reranked_hits = []
+            for item in results_meta:
+                original_idx = item.get("index", 0)
+                score = item.get("score", 0.0)
+                if 0 <= original_idx < len(hits):
+                    hit = hits[original_idx].copy()
+                    hit["score"] = score
+                    reranked_hits.append(hit)
+
+            if top_k is not None and top_k > 0:
+                reranked_hits = reranked_hits[:top_k]
+
+            if reranked_hits:
+                top_scores = [f"{h.get('score', 0):.4f}" for h in reranked_hits[:3]]
+                logger.info(
+                    f"Voyage reranking completed: {len(reranked_hits)} results, top scores: {top_scores}"
+                )
+            return reranked_hits
+
+        except Exception as e:
+            logger.error(f"Voyage reranking failed: {e}")
+            sorted_hits = sorted(hits, key=lambda x: x.get("score", 0), reverse=True)
+            if top_k is not None and top_k > 0:
+                sorted_hits = sorted_hits[:top_k]
+            return sorted_hits
+
+    def get_model_name(self) -> str:
+        return self.config.model
diff --git a/methods/EverCore/src/infra_layer/adapters/out/search/repository/episodic_memory_qdrant_repository.py b/methods/EverCore/src/infra_layer/adapters/out/search/repository/episodic_memory_qdrant_repository.py
index 45a769c5..2f17a0c3 100644
--- a/methods/EverCore/src/infra_layer/adapters/out/search/repository/episodic_memory_qdrant_repository.py
+++ b/methods/EverCore/src/infra_layer/adapters/out/search/repository/episodic_memory_qdrant_repository.py
@@ -12,7 +12,7 @@
 
 import asyncio
 import json
-from datetime import datetime
+from datetime import datetime, timezone
 from functools import partial
 from typing import Any, Dict, List, Optional