DOC-7268 Add a read-only Repo Memory query action

.github/actions/repo-memory-query/README.md

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+# Repo Memory Query
+
+A read-only search of the [Repo Memory](https://github.com/redis-learn/redis-repo-memory) store from a
+description of work you are about to do. Use it to find related prior PRs, commits and issues, with
+their full squash or commit messages, before any PR exists.
+
+It is separate from the `redis-learn/redis-repo-memory` action on purpose. That action runs on every
+push and PR and writes to the store. This one only reads, runs only when someone starts it, and can
+change or go away without affecting the memory comments.
+
+It never creates the index, never writes a key, and never posts to a PR or commit. It uses the same
+`MEMORY_REDIS_URL` and `OPENAI_API_KEY` secrets as `repo-memory.yml`.
+
+## Run it
+
+```sh
+gh workflow run repo-memory-query.yml \
+  -f query="Move the job-queue use case from JedisPool to RedisClient" \
+  -f files="content/develop/use-cases/job-queue/java-jedis/RedisJobQueue.java"
+```
+
+The workflow file must be on the default branch for `gh workflow run` to find it. Results appear in
+the run's step summary as a list. The full text of each result is on one log line that starts with
+`REPO_MEMORY_QUERY_RESULT_JSON`, followed by JSON, so a script can read it from
+`gh run view <id> --log`.
+
+## Inputs
+
+| Input | Default | Meaning |
+| --- | --- | --- |
+| `redis-url` | required | Redis URL of the memory store |
+| `openai-api-key` | required | Embeds the query with `text-embedding-3-small` |
+| `query` | required | The planned work |
+| `query-files` | none | Files you plan to change |
+| `query-limit` | `5` | Maximum results |
+| `query-max-distance` | `0.60` | Cosine distance cutoff, as in the memory action |
+| `github-token` | `github.token` | Reads the full message behind each result |
+
+Only items from the repository the workflow runs in are returned.
+
+## Visibility
+
+Workflow logs of a public repository are public. The query text, and the results, are printed in the
+log, so don't put anything confidential in a query. The results are titles and messages of this
+repository's own public PRs and commits.
+
+## Compatibility with the memory action
+
+`query.js` reads what `redis-learn/redis-repo-memory` writes: the `repo_memory_idx` index, `memory:`
+hashes, and a cosine `embedding` field from `text-embedding-3-small`. If the memory action changes
+that layout, update `query.js` and the seed in `test.js` to match.
+
+## Test
+
+The test needs an empty Redis 8 (Search is built in) and uses a mock embedding, so it needs no
+OpenAI key or network access. It refuses to run against a database that has any keys.
+
+```sh
+cd .github/actions/repo-memory-query
+npm ci
+REPO_MEMORY_TEST_REDIS_URL=redis://localhost:6379 node test.js
+```

.github/actions/repo-memory-query/action.yml

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+name: 'Redis Repo Memory Query'
+description: >
+  Read-only search of an existing Redis Repo Memory store from a description of planned work.
+  Never writes to Redis and never posts to a pull request or commit.
+
+inputs:
+  redis-url:
+    description: >
+      Redis connection URL of the Repo Memory store (the same value the
+      redis-learn/redis-repo-memory action uses), e.g. redis://default:<password>@<host>:<port>
+    required: true
+  openai-api-key:
+    description: OpenAI API key used to embed the query (text-embedding-3-small).
+    required: true
+  query:
+    description: Description of the work you are about to do.
+    required: true
+  query-files:
+    description: Files you plan to change, separated by spaces, commas or newlines.
+    required: false
+    default: ''
+  query-limit:
+    description: Maximum number of results.
+    required: false
+    default: '5'
+  query-max-distance:
+    description: Maximum cosine distance (0-2, lower is more similar) for a result.
+    required: false
+    default: '0.60'
+  github-token:
+    description: >
+      Token used to read the full squash or commit message behind each result.
+      The default github.token is enough for a public repository.
+    required: false
+    default: ${{ github.token }}
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Set up Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '24'
+
+    - name: Install dependencies
+      shell: bash
+      working-directory: ${{ github.action_path }}
+      run: npm ci --omit=dev
+
+    - name: Query memory
+      shell: bash
+      env:
+        REDIS_URL: ${{ inputs.redis-url }}
+        OPENAI_API_KEY: ${{ inputs.openai-api-key }}
+        GITHUB_TOKEN: ${{ inputs.github-token }}
+        QUERY_TEXT: ${{ inputs.query }}
+        QUERY_FILES: ${{ inputs.query-files }}
+        QUERY_LIMIT: ${{ inputs.query-limit }}
+        QUERY_MAX_DISTANCE: ${{ inputs.query-max-distance }}
+      run: node "${{ github.action_path }}/query.js"