Distillation

🟡 (12:42) Updated packages/cli/test/lib/delta-upgrade.test.ts; subsequent checks on the 2 changed files completed in 2 seconds with no fixes applied.
🟡 (12:42) Final focused Vitest 4.1.10 run passed 97 tests across 2 test files in 2.91 seconds. It emitted the expected warning [delta-upgrade] Delta upgrade failed (Patch too small: 4 bytes (need at least 32)), falling back to full download and the Vitest 4 warning that test.poolOptions was removed and former poolOptions are now top-level.
🟡 (12:43) Final diff statistics for the scoped changes were 51 insertions and 30 deletions in packages/cli/src/lib/delta-upgrade.ts, plus 170 insertions and 3 deletions in packages/cli/test/lib/delta-upgrade.test.ts—221 insertions and 33 deletions total.
🟡 (12:43) Assistant reported the pre-fix regression test result as 3 failed and 82 passed; after implementing source-affine delta upgrades, the final focused result was 97 passed across 2 files.
🟡 (12:43) Assistant’s final implementation report: threaded UpgradeSource through stable/nightly resolution, attemptDeltaUpgrade, and prefetch; GitHub requests use source.githubRepo; GHCR requests use source.ghcrRepo; primary-source defaults and existing binpatch behavior remain unchanged; deterministic legacy-source URL and source-affinity tests were added.
🟡 (12:43) Final validation report: Biome passed, git diff --check passed, and no type errors remained in packages/cli/src/lib/delta-upgrade.ts or packages/cli/test/lib/delta-upgrade.test.ts. Full typecheck remained blocked by 23 errors in concurrently modified out-of-scope files.

Distillation

Observations