Rename crate to mytheclipse and flatten workspace to single crate

- Rename corex -> mytheclipse (corex name taken on crates.io by an
  unrelated crate published by David-Kunz in 2023)
- Flatten corex + corex-core workspace into a single crate; all modules
  (context/error/io/compute/bg) now live directly under src/
- Update Cargo.toml metadata: real repo URL, docs.rs, author
- Update README, example, doc comments, tracing span names
- Fix CI: single package dry-run (corex-core no longer separate)
- Fix publish workflow: single cargo publish step

.github/workflows/ci.yml

@@ -29,9 +29,9 @@ jobs:
         with:
           components: clippy
       - name: Clippy (all features)
-        run: cargo clippy --workspace --all-features -- -D warnings
+        run: cargo clippy --all-features -- -D warnings
       - name: Clippy (no default features)
-        run: cargo clippy --workspace --no-default-features -- -D warnings
+        run: cargo clippy --no-default-features -- -D warnings
 
   test-matrix:
     name: Test (${{ matrix.name }})
@@ -54,9 +54,9 @@ jobs:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
       - name: Build
-        run: cargo build --workspace ${{ matrix.flags }}
+        run: cargo build --all-targets ${{ matrix.flags }}
       - name: Test
-        run: cargo test --workspace ${{ matrix.flags }}
+        run: cargo test ${{ matrix.flags }}
 
   example:
     name: Run example
@@ -72,7 +72,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
-      - run: RUSTDOCFLAGS="-D warnings" cargo doc --workspace --all-features --no-deps
+      - run: RUSTDOCFLAGS="-D warnings" cargo doc --all-features --no-deps
 
   package:
     name: Cargo package dry-run
@@ -80,7 +80,5 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
-      - name: Package corex-core
-        run: cargo package -p corex-core --no-verify
-      - name: Package corex
-        run: cargo package -p corex --no-verify
+      - name: Package
+        run: cargo package --no-verify