feat(memory): enforce English-only memory indexing with CJK guardrail

Memory layer is now English-indexed: memories() query terms and
  remember() summaries must be English. Adds a runtime assertion that
  rejects CJK text in both paths, guiding the agent to translate
  non-English user requests before querying or writing memories.
  Ensures consistent retrieval regardless of conversation language.

references/query-patterns.md

@@ -18,7 +18,7 @@ faceted detail pass if the first pass reveals useful projects, sessions, files,
 or terms.
 
 ```js
-const topic = 'topic terms from the user request';
+const topic = 'English topic terms translated from the user request';
 const map = overview({ limit: 6 });
 const project = map.current.project?.project;
 const scoped = project ? { project } : {};
@@ -124,6 +124,7 @@ return hits.slice(0, 5).map(h => {
 Use this when prior conclusions may exist but the answer still depends on raw
 session evidence. Keep memory as prior notes, not final authority; compare it
 with session evidence in your final answer when correctness matters.
+Memory query terms are English even when the user asks in another language.
 
 ```js
 const project = '%quiet-zero%';

references/retrieval-semantics.md

@@ -106,6 +106,11 @@ For semantic questions, build a task-local evidence view:
 }
 ```
 
+Memory recall is English-indexed: translate non-English user requests into
+concise English query terms before calling `memories({ query })`. Memory
+summaries registered with `remember()` are also English, regardless of the
+conversation language.
+
 Then synthesize the conclusion in the final answer. Do not pretend the raw
 evidence view is itself a stored Obelisk entity.
 

references/schema.md

@@ -527,7 +527,7 @@ is treated as `sessionId`, and passing a number is treated as `limit`.
 
 | Param | Type | Description |
 |-------|------|-------------|
-| `opts.query` | `string` | Term filter over `summary` and `path`; hyphens/underscores are treated as spaces |
+| `opts.query` | `string` | English term filter over `summary` and `path`; hyphens/underscores are treated as spaces |
 | `opts.project` | `string` | SQL `LIKE` pattern over `memories.project` |
 | `opts.sessionId` | `string` | Restrict to one source session |
 | `opts.sessions` | `string[]` | Restrict to a set of source session IDs |
@@ -538,9 +538,11 @@ is treated as `sessionId`, and passing a number is treated as `limit`.
 
 **Returns:** `Array<memory_row>` ordered by `created_at` descending.
 
-`query` is a lightweight term filter, not FTS5 ranking. Use it to avoid pulling
-all recent memories, then read the markdown file at `path` when a memory looks
-relevant.
+`query` is a lightweight English term filter, not FTS5 ranking. Translate
+non-English user requests into concise English query terms before calling
+`memories()`. Use it to avoid pulling all recent memories, then read the
+markdown file at `path` when a memory looks relevant. The runtime rejects
+obvious CJK text in memory queries.
 
 ```js
 const prior = memories({
@@ -569,14 +571,15 @@ normal `--query` script.
 | Param | Type | Description |
 |-------|------|-------------|
 | `record.path` | `string` | Existing markdown file path. Relative paths resolve against the source session `project_path` when `session_id` is provided, otherwise against the runtime cwd |
-| `record.summary` | `string` | Required retrieval summary: decision, reasoning, constraints |
+| `record.summary` | `string` | Required English retrieval summary: decision, reasoning, constraints |
 | `record.session_id` | `string` | Source session ID, if known |
 | `record.message_start` | `string` | First relevant source message UUID, if known |
 | `record.message_end` | `string` | Last relevant source message UUID, if known |
 | `record.project` | `string` | Project slug override. Defaults from `sessions.project` for `session_id` |
 
-`remember()` validates that `path` exists and is a regular file. It stores the
-normalized absolute path in `memories.path`.
+`remember()` validates that `path` exists and is a regular file, and rejects
+obvious CJK text in `summary`. It stores the normalized absolute path in
+`memories.path`.
 
 **Returns:** `{ id, path, project, created_at }`.