fix: restore setup-agent-env.sh copy in prioritize scaffold workflow

[ifireball]

Summary

• Fixes Prioritize workflow template so workspace prep copies setup-agent-env.sh from internal/scaffold/fullsend-repo/.github/scripts/ (the script’s real location), not the non-existent repo-root .github/scripts/ path.
• Aligns internal/scaffold/fullsend-repo/.github/workflows/prioritize.yml with gh-classify.yml, scribe.yml, and the reusable agent workflows: broad sparse-checkout of internal/scaffold/fullsend-repo/, SRC + LAYERED_DIRS pattern, and explicit cp "${SRC}/.github/scripts/setup-agent-env.sh".
• Adds scaffold test assertions to prevent regressing to .defaults/.github/scripts.

Pairs with fullsend-ai/.fullsend#77 (runtime fix in the config repo). After both merge, orgs that sync from scaffold get the corrected template; .fullsend gets immediate relief without waiting for a v0 tag bump for the script itself (it already exists at the scaffold path on @v0).

Test plan

• go test ./internal/scaffold/ -run TestPrioritizeWorkflowContent
• After merge: scaffold sync / installer picks up updated prioritize.yml for new installs
• With .fullsend#77 merged: re-run Prioritize workflow and confirm Setup agent environment succeeds

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Commit: 3a8f8d8d36946ba9054476c1389ebd9901dac385

[fullsend-ai-review]

Review

Findings

No findings.

The fix correctly addresses a broken path in the prioritize scaffold workflow. The old code tried to copy setup-agent-env.sh from .defaults/.github/scripts/ (a non-existent repo-root path), while the script actually lives at internal/scaffold/fullsend-repo/.github/scripts/setup-agent-env.sh. The new code uses ${SRC}/.github/scripts/setup-agent-env.sh where SRC=".defaults/internal/scaffold/fullsend-repo", matching the established pattern in all five reusable workflows (reusable-triage, reusable-review, reusable-code, reusable-retro, reusable-fix).

The sparse-checkout simplification from listing individual subdirectories to the broader internal/scaffold/fullsend-repo/ path is also consistent with those reusable workflows and ensures .github/scripts/ is included in the checkout.

The two new test assertions (assert.Contains for the correct cp command and assert.NotContains for the old broken path) provide good regression protection.