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Stacked on #4020, not independently mergeable. Nothing on the same-repo PR path consumes either half of what `build-talos` produces. `image-talos` pushes `${REGISTRY}/talos:pr-N-sha`, which no chart in the tree references and which is not even version-tagged here (`PUBLISH_VERSIONED` and `PUBLISH_FLOATING` are both 0). `image-matchbox` stamps `packages/extra/bootbox/images/matchbox.tag`, and that one line is the whole content of `pr-patch-fragment-talos` - checked against the artifact from a real run - but bootbox is opt-in and the E2E platform Package does not enable it, so no run pulls the image. Unstamped tag leaves installer artifact pointing at released matchbox, which is a valid ref nothing on this path resolves. So the job ran a privileged siderolabs imager build on every PR for two artifacts with no reader. Now it runs when the PR touched `packages/core/talos`, and `finalize` accepts a skipped result as well as a successful one. Without that second half skipping it would block finalize, and therefore e2e, on nearly every PR. Forks keep the unconditional build, and the reason is not about talos. `e2e-fork.yaml` publish job requires at least one OCI archive to exist, an invariant that holds today only because this job always ran, so a fork PR touching nothing under `packages/` would arrive with an empty export and fail a legitimate run. Teaching that guard what `plan` expected to build is work in the fork allowlist path and belongs in its own change. Saving is about 1.5-2 min of critical path. Main point is removing a privileged image build that nobody reads from every pull request. <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit - **CI Improvements** - Pull request validation now runs Talos builds only when relevant changes require them, while retaining full validation for fork-based contributions. - Finalization correctly handles skipped Talos builds and preserves generated boot artifacts when builds succeed. - Changed-file detection now accounts for renames, deletions, and shared build inputs. - **Documentation** - Updated testing and build guidance to reflect the current validation behavior. - **Tests** - Added comprehensive coverage for build classification, workflow outputs, skipped jobs, and artifact handling. <!-- end of auto-generated comment: release notes by coderabbit.ai -->