phase 10: release pipeline (Gitea release on v* tag)

P9 resolved (SPEC §11): stay manual. CI builds the four Linux targets
via cross; macOS + Windows binaries are produced ad hoc by maintainers
and uploaded to the same Gitea release.

§8.2/§8.4 updated: crates.io publish is deferred for now (workflow
ships the Gitea release only; can be re-enabled with a one-line
`cargo publish -p nuwiki-core` job once we're ready to publish). The
CARGO_REGISTRY_TOKEN row in §8.4 is struck through accordingly.

release.yaml:

- Trigger: `push` on tags matching `v*`.
- build matrix (4 jobs): x86_64/aarch64 × gnu/musl. Each pins
  Rust 1.83, caches `~/.cargo/{bin,registry,git}` + `target` keyed
  on target + Cargo.lock hash, installs `cross 0.2.5` if not in
  cache, runs `cross build --release -p nuwiki-ls`, packages as
  `nuwiki-ls-{version}-{target}.tar.gz`, uploads as an artifact.
- release job: `needs: build`. Downloads all build artifacts via
  download-artifact@v4 with `merge-multiple: true`; installs jq +
  curl if missing; POSTs a release-create payload to
  `/api/v1/repos/$REPO/releases` using `RELEASE_TOKEN`, then streams
  each `.tar.gz` to `/releases/{id}/assets?name=…`. Up-front check
  fails fast if the secret is unset.

README + SPEC top-line status: "All phases (0–10) complete." 172
tests still green locally.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -3,9 +3,10 @@
 A Vim/Neovim plugin providing full vimwiki syntax support, implemented as a
 Rust-based language server (LSP).
 
-> **Status:** Phase 9 (editor glue) complete. Plugin installable via
-> lazy.nvim / vim-plug / Dein; setup() + LSP wiring + binary downloader +
-> :checkhealth ship. Only the release pipeline remains.
+> **Status:** All phases (0–10) complete. v1 feature set landed:
+> editor-independent core, vimwiki lexer + parser, HTML renderer,
+> tower-lsp server with diagnostics + outline + semantic tokens +
+> navigation + workspace index, plugin glue, and release pipeline.
 
 See [`SPEC.md`](./SPEC.md) for the full project specification.
 
@@ -23,7 +24,7 @@ See [`SPEC.md`](./SPEC.md) for the full project specification.
 | 7 | Semantic Tokens | ✅ done |
 | 8 | Navigation | ✅ done |
 | 9 | Editor Glue | ✅ done |
-| 10 | CI/CD release pipeline | ⏳ next |
+| 10 | CI/CD release pipeline | ✅ done |
 
 ## Repository layout