Add simple personal-memory branch binary workflow

Add a standalone manual workflow_dispatch job for the personal-memory branch.
It builds the Linux amd64 binary directly with scripts/build.sh, verifies the
manage_memory tool is present, packages the binary, and uploads it as an
artifact. The workflow is branch-guarded and does not use release workflows.

Signed-off-by: Alejandro Blanco-M <alecuba16@gmail.com>

Author: alecuba16

.github/workflows/personal-memory-build.yml

@@ -0,0 +1,75 @@
+# Manual binary build for the personal-memory branch only.
+# Intentionally standalone and simple: no release workflow, no reusable workflow,
+# no publishing to GitHub Releases. It just builds one Linux x64 binary and
+# uploads a downloadable artifact from the selected branch ref.
+name: Personal Memory Branch Binary
+
+run-name: personal-memory binary @ ${{ github.ref_name }}
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: "Optional version string embedded in the binary, e.g. personal-memory-preview"
+        required: false
+        type: string
+        default: ""
+
+permissions:
+  contents: read
+
+jobs:
+  build-linux-amd64:
+    name: Build Linux amd64 artifact
+    runs-on: ubuntu-latest
+    timeout-minutes: 120
+    steps:
+      - name: Annotate branch scope
+        shell: bash
+        run: |
+          echo "::notice title=Branch-only workflow::This workflow is only for the personal-memory branch. Current ref: ${GITHUB_REF_NAME}."
+          if [ "${GITHUB_REF_NAME}" != "personal-memory" ]; then
+            echo "::error title=Wrong branch::Run this workflow with ref personal-memory. No binary will be built for ${GITHUB_REF_NAME}."
+            exit 1
+          fi
+
+      - name: Checkout selected branch
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+
+      - name: Install build dependencies
+        run: sudo apt-get update && sudo apt-get install -y build-essential zlib1g-dev
+
+      - name: Build binary
+        shell: bash
+        env:
+          VERSION: ${{ inputs.version }}
+        run: |
+          set -euo pipefail
+          if [ -n "$VERSION" ]; then
+            scripts/build.sh --version "$VERSION" CC=gcc CXX=g++
+          else
+            scripts/build.sh CC=gcc CXX=g++
+          fi
+          build/c/codebase-memory-mcp --version
+          build/c/codebase-memory-mcp --help | grep -q 'manage_memory'
+
+      - name: Package artifact
+        shell: bash
+        run: |
+          set -euo pipefail
+          mkdir -p dist/codebase-memory-mcp-personal-memory-linux-amd64
+          cp build/c/codebase-memory-mcp LICENSE install.sh dist/codebase-memory-mcp-personal-memory-linux-amd64/
+          scripts/gen-third-party-notices.sh dist/codebase-memory-mcp-personal-memory-linux-amd64/THIRD_PARTY_NOTICES.md
+          tar -czf dist/codebase-memory-mcp-personal-memory-linux-amd64.tar.gz \
+            -C dist codebase-memory-mcp-personal-memory-linux-amd64
+          sha256sum dist/codebase-memory-mcp-personal-memory-linux-amd64.tar.gz \
+            > dist/codebase-memory-mcp-personal-memory-linux-amd64.tar.gz.sha256
+
+      - name: Upload binary artifact
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: codebase-memory-mcp-personal-memory-linux-amd64
+          path: |
+            dist/codebase-memory-mcp-personal-memory-linux-amd64.tar.gz
+            dist/codebase-memory-mcp-personal-memory-linux-amd64.tar.gz.sha256
+          if-no-files-found: error