ci: undo the rust-cache lines #1109 added to ci.yml (#1111)

ci.yml still runs its own jobs, and the CI workflow rules (CLAUDE.md, AGENTS.md) keep additions
out of such files: moving the jobs into craft-common-actions is its own task. #1109 added
prefix-key and save-if to both rust-cache steps; this removes them. The dev profile change from
#1109 stays. The cache churn is raised as storytold/craft-common-actions#118.

Co-authored-by: FredApps <FredApps@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -42,14 +42,7 @@ jobs:
         with:
           components: clippy, rustfmt
 
-      # Only main saves; pull requests restore main's cache. A PR's own cache (up to 1.2 GB per OS)
-      # is visible to that PR alone, and with the repository at its 10 GB limit the PR caches
-      # evicted main's: Windows legs then found no cache and compiled every dependency.
-      # v1: the dev profile dropped dependency debug info, and an existing key is never resaved.
       - uses: Swatinem/rust-cache@d1527c8f67ef9af357290475d4af4b0fab8f12e0 # v2.9.3
-        with:
-          prefix-key: v1-rust
-          save-if: ${{ github.ref == 'refs/heads/main' }}
 
       - name: Format
         if: runner.os == 'Linux'
@@ -74,9 +67,7 @@ jobs:
           components: clippy
       - uses: Swatinem/rust-cache@d1527c8f67ef9af357290475d4af4b0fab8f12e0 # v2.9.3
         with:
-          prefix-key: v1-rust
           key: wasm32
-          save-if: ${{ github.ref == 'refs/heads/main' }}
       - name: Check wasm-safe crates
         run: cargo xtask wasm
       - name: Clippy (wasm32)