chore(release): 0.1.0

- Add LICENSE (MIT, copyright 2026 Stephen Waits)
- Add README.md reflecting the current TUI: two-column preview pane
  with jj show --summary, live command preview row, default-to-show
  behavior, full keybinding table, shell integration matrix, internals
  overview, attribution to oppi.li's original bash+fzf concept
- Add CHANGELOG.md (keep-a-changelog format) with 0.1.0 release notes
- Add .github/workflows/ci.yml — fmt + clippy + check on every push/PR;
  build matrix on stable + 1.85 (MSRV)
- Update Cargo.toml: refined description, repository/homepage/docs
  URLs, keywords + categories, rust-version=1.85, exclude .github and
  ux.txt from the published tarball
- Update .gitignore to also exclude ux.txt (scratch UX mockup)

Verified clean:
  cargo fmt --all -- --check
  cargo clippy --all-targets -- -D warnings
  cargo publish --dry-run --allow-dirty  (16 files, 20.6 KiB compressed)

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+env:
+  CARGO_TERM_COLOR: always
+  RUSTFLAGS: "-Dwarnings"
+
+jobs:
+  check:
+    name: check / clippy / fmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy, rustfmt
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo fmt --all -- --check
+      - run: cargo clippy --all-targets -- -D warnings
+      - run: cargo check --all-targets
+
+  build:
+    name: build (${{ matrix.toolchain }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        toolchain: [stable, "1.85"]
+    steps:
+      - uses: actions/checkout@v5
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.toolchain }}
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo build --release