feat: Rust backbone + MARC27 platform integration + workflow engine

Rust CLI (crates/cli, crates/node, crates/proto, crates/runtime, crates/workflows):
- prism CLI: setup, login (device flow), status, node, workflow, backend
- prism-node: capability probing (CPU, GPU, RAM, disk, software, scheduler)
- Proto: typed NodeMessage/PlatformMessage matching marc27-core WebSocket protocol
- Runtime: path resolution, endpoint derivation, credential management
- Workflows: YAML spec parsing, forge.yaml embedded

Python TAOR agent:
- Multi-backend: Anthropic, OpenAI, OpenRouter, MARC27 native
- Model config refactor: per-provider defaults, context window, pricing
- Backend factory: provider resolution from env/settings/credentials
- Autonomous mode improvements, plan mode fixes
- 33 tools + 10 skills intact

Frontend (Ink TUI):
- JSON-RPC 2.0 protocol over stdio
- 11 React components: Prompt, StreamingText, ToolCard, etc.
- Markdown renderer for rich output
- Welcome bar with 4 status checks
- Session list, cost tracking

Tests:
- Backend model config tests
- Anthropic/OpenAI backend tests
- CLI binary discovery tests
- Plan mode tests

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Darth-Hidious

.github/workflows/native-release.yml

@@ -0,0 +1,78 @@
+name: Native Release
+
+on:
+  push:
+    tags:
+      - "v*"
+  workflow_dispatch:
+
+jobs:
+  package-native:
+    name: Package Native (${{ matrix.label }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-latest
+            label: linux-x86_64
+            rust_target: x86_64-unknown-linux-gnu
+            bun_target: bun-linux-x64
+            archive: prism-linux-x86_64.tar.gz
+            tui_binary: prism-tui
+          - os: macos-14
+            label: macos-aarch64
+            rust_target: aarch64-apple-darwin
+            bun_target: bun-darwin-arm64
+            archive: prism-macos-aarch64.tar.gz
+            tui_binary: prism-tui
+          - os: macos-13
+            label: macos-x86_64
+            rust_target: x86_64-apple-darwin
+            bun_target: bun-darwin-x64
+            archive: prism-macos-x86_64.tar.gz
+            tui_binary: prism-tui
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          target: ${{ matrix.rust_target }}
+
+      - uses: Swatinem/rust-cache@v2
+
+      - uses: oven-sh/setup-bun@v2
+
+      - name: Install frontend deps
+        run: cd frontend && bun install --frozen-lockfile
+
+      - name: Build Rust binaries
+        run: cargo build --release --bin prism --bin prism-node --target ${{ matrix.rust_target }}
+
+      - name: Build TS TUI binary
+        run: |
+          cd frontend
+          bun build src/index.tsx --compile \
+            --target=${{ matrix.bun_target }} \
+            --outfile ../dist/${{ matrix.tui_binary }}
+
+      - name: Assemble package
+        shell: bash
+        run: |
+          mkdir -p package
+          cp target/${{ matrix.rust_target }}/release/prism package/
+          cp target/${{ matrix.rust_target }}/release/prism-node package/
+          cp dist/${{ matrix.tui_binary }} package/prism-tui
+          tar -C package -czf ${{ matrix.archive }} .
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.archive }}
+          path: ${{ matrix.archive }}
+
+      - name: Publish release assets
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: softprops/action-gh-release@v2
+        with:
+          files: ${{ matrix.archive }}

.github/workflows/rust-backbone.yml

@@ -0,0 +1,60 @@
+name: Rust Backbone
+
+on:
+  pull_request:
+    paths:
+      - "Cargo.toml"
+      - "Cargo.lock"
+      - "crates/**"
+      - ".github/workflows/rust-backbone.yml"
+  push:
+    branches:
+      - main
+    paths:
+      - "Cargo.toml"
+      - "Cargo.lock"
+      - "crates/**"
+      - ".github/workflows/rust-backbone.yml"
+
+concurrency:
+  group: rust-backbone-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  fmt:
+    name: Rust Format
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+      - run: cargo fmt --all --check
+
+  lint-and-test:
+    name: Rust Lint And Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo clippy --workspace --all-targets -- -D warnings
+      - run: cargo test --workspace
+
+  build-matrix:
+    name: Rust Build (${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+          - windows-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo build --workspace --release