feat(zed): publish the Zed extension to a build-gated mirror on release

[abdushakoor12]

TLDR

Adds the release path that ships the Basilisk Zed extension by rendering a self-contained, WASM-build-gated mirror to Nimblesite/basilisk-zed on every tag.

What Was Added?

• scripts/render-zed-mirror.sh — renders the in-repo basilisk-zed/ crate into a tree the zed-industries/extensions registry can build standalone: vendors the zero-dep basilisk-common under vendor/, rewrites the workspace path-dependency to the vendored copy, drops workspace-only [lints] inheritance, and appends an empty [workspace] so the mirror is its own workspace root.
• scripts/set_toml_version.py — a tomllib-validated version setter the render script uses to stamp the extension Cargo.toml, the vendored crate Cargo.toml, and extension.toml. It parses each file, replaces the single scoped version line, and re-parses to confirm the result is valid TOML (a structured write, not blind sed).
• publish-zed job in release.yml — on a v* tag it renders the mirror, gates the push on a real cargo build --release --target wasm32-wasip2, then pushes and tags Nimblesite/basilisk-zed using BREW_SCOOP_PAT (same clone-replace-commit-push-tag convention as publish-nvim).

What Was Changed or Deleted?

• Untracked committed Zed build-artifact drift — basilisk-zed/extension.wasm and the entire basilisk-zed/dist/** tree (a stale packaged copy: another extension.wasm, extension.toml, debug-adapter schema, and tree-sitter .scm queries). All are already .gitignored and regenerated by every build, so they were removed from version control (the files remain on disk).
• No behaviour in the shipped binaries, LSP, or other editor extensions changed — the diff is limited to the Zed release tooling, docs, and the artifact untracking.

How Do The Automated Tests Prove It Works?

• make ci passes end to end (lint + full Rust test suite & coverage thresholds + release build).
• Zed extension job is green: cargo build --release --target wasm32-wasip2, cargo clippy, and 96 unit tests (cargo test -p basilisk-zed) pass.
• The render path was exercised directly: render-zed-mirror.sh produces a placeholder-free tree whose standalone wasm32-wasip2 build succeeds (basilisk-zed vX.Y.Z → valid .wasm), including with a SemVer pre-release tag, proving set_toml_version.py stamps all three TOML carriers correctly.
• Lint gate green: ruff format --check, ruff check, cargo fmt --check, and the deslop duplication gate all pass.

Spec / Doc Changes

• docs/specs/ZED-SPEC.md: new [ZED-MIRROR] section documenting the registry-publish mechanism and the two structural blockers it solves (placeholder version + workspace path-dep), and a fix to the binary-download repo slug in [ZED-DIST] (basilisk-lang/basilisk → Nimblesite/Basilisk, matching the release::GITHUB_REPO constant the extension actually uses).

Breaking Changes

• None