Add Phase 0 private-repo smoke-test task

Author: mark-e-deyoung

tasks/phase0-private-repo-smoke-test.md

@@ -0,0 +1,25 @@
+# Phase 0 — Private repository smoke test
+
+## Objective
+
+Inspect the target repository and add a `VALIDATION.md` file that documents the minimal end-to-end validation sequence already described by the repository's existing documentation.
+
+## Constraints
+
+- Documentation-only change.
+- Do not modify production code, Docker/container configuration, project files, tests, or existing documentation.
+- Verify that the documented commands are internally consistent with the repository structure before writing them into `VALIDATION.md`.
+- If an inconsistency is found, document it in `VALIDATION.md` rather than changing the implementation.
+- Do not add dependencies.
+- Keep the change narrowly scoped to the requested file.
+
+## Completion criteria
+
+- `VALIDATION.md` exists and provides a concise, reproducible validation sequence.
+- The sequence is grounded in commands and paths that already exist in the repository.
+- Any observed inconsistencies are explicitly identified.
+- Create a pull request containing only this documentation change.
+
+## Experiment purpose
+
+This task is intentionally low risk. Its purpose is to verify the control path from the public `agent-dispatch` repository through the Jules REST API into an authorized private GitHub repository and back to a durable private pull request. Coding quality is not the primary variable in this run.