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)

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Stephen Waits <steve@waits.net>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.