ci(quasar): support multi-program projects; re-enable cross-program-invocation/quasar

The CPI quasar example contains two separate Quasar programs (hand/ and lever/)
rather than a single program with a root Quasar.toml, so the Quasar workflow —
which ran `quasar build && cargo test` directly in the project dir — failed
(quasar build requires ./src/lib.rs and is single-program only), and the
example was excluded in .ghaignore.

Teach the workflow's build_and_test to detect a project's program directories:
the project itself when it has a Quasar.toml (unchanged for every existing
example), otherwise its immediate subdirectories that each contain one. It now
builds all of a project's programs first, then tests them all — so hand's test,
which loads lever's freshly-built .so to exercise the CPI, finds it regardless
of directory order (the 47 quasar projects shard across parallel jobs, so
cross-project build order can't be relied on).

Verified locally with the quasar CLI: both programs build and all tests pass
(hand 3, lever 4). Drop the example from .github/.ghaignore.

Author: claude

.github/.ghaignore

@@ -12,8 +12,6 @@ compression/cnft-vault/anchor
 # builds but need to test on localhost
 compression/cnft-burn/anchor
 
-# CPI quasar project uses subdirectories (hand/ and lever/) instead of a root Quasar.toml
-basics/cross-program-invocation/quasar
 
 
 # build failed - program outdated

.github/workflows/quasar.yml

@@ -171,22 +171,49 @@ jobs:
             echo "Building and Testing $project with Solana $solana_version"
             cd "$project" || return 1
 
-            # Build with quasar CLI
-            if ! quasar build; then
-              echo "::error::quasar build failed for $project"
-              echo "$project: quasar build failed with $solana_version" >> $GITHUB_WORKSPACE/failed_projects.txt
-              cd - > /dev/null
-              return 1
+            # Determine the quasar program directories for this project. Normally
+            # the project dir itself holds the Quasar.toml. Some examples (e.g. the
+            # cross-program-invocation CPI demo) instead contain several program
+            # subdirectories (hand/, lever/), each its own Quasar project. In that
+            # case build them all *first*, then test them all, so a program whose
+            # tests load a sibling program's compiled .so (the CPI callee) has it
+            # available regardless of directory order.
+            local prog_dirs=()
+            if [ -f Quasar.toml ]; then
+              prog_dirs=(".")
+            else
+              for d in */; do
+                [ -f "${d}Quasar.toml" ] && prog_dirs+=("${d%/}")
+              done
             fi
 
-            # Run Rust tests (quasar examples use cargo test with quasar-svm)
-            if ! cargo test; then
-              echo "::error::cargo test failed for $project"
-              echo "$project: cargo test failed with $solana_version" >> $GITHUB_WORKSPACE/failed_projects.txt
+            if [ ${#prog_dirs[@]} -eq 0 ]; then
+              echo "::error::no Quasar.toml found for $project"
+              echo "$project: no Quasar.toml found with $solana_version" >> $GITHUB_WORKSPACE/failed_projects.txt
               cd - > /dev/null
               return 1
             fi
 
+            # Build every program first.
+            for d in "${prog_dirs[@]}"; do
+              if ! ( cd "$d" && quasar build ); then
+                echo "::error::quasar build failed for $project ($d)"
+                echo "$project: quasar build failed with $solana_version" >> $GITHUB_WORKSPACE/failed_projects.txt
+                cd - > /dev/null
+                return 1
+              fi
+            done
+
+            # Then run Rust tests (quasar examples use cargo test with quasar-svm).
+            for d in "${prog_dirs[@]}"; do
+              if ! ( cd "$d" && cargo test ); then
+                echo "::error::cargo test failed for $project ($d)"
+                echo "$project: cargo test failed with $solana_version" >> $GITHUB_WORKSPACE/failed_projects.txt
+                cd - > /dev/null
+                return 1
+              fi
+            done
+
             echo "Build and tests succeeded for $project with $solana_version version."
             cd - > /dev/null
             return 0