diff --git a/agentic-loop-traces/issue-27.md b/agentic-loop-traces/issue-27.md
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+# Agentic Loop Trace for Issue #27
+
+- Branch: `agentic/issue-27`
+- Purpose: committed audit trail of agent decisions for human review.
+
+## Planner - 2026-06-19T09:08:05.852633+00:00
+
+- Summary: Add the requested text fixture under `tests/agentic_demo/` and a single focused Python test that asserts the file content matches the three exact lines, using `origin/main` as the comparison base.
+
+### Steps
+1. Create `tests/agentic_demo/sample.txt` with exactly the three lines `alpha`, `beta`, and `gamma` in that order, with no extra whitespace or blank lines.
+   - Verify: Open the file and confirm the content is exactly three newline-terminated lines and no additional bytes.
+2. Add one minimal pytest test that reads `tests/agentic_demo/sample.txt` and asserts its full contents match the expected text exactly.
+   - Verify: Run `python -m pytest` and confirm the new test passes.
+
+### Risks
+- Line ending differences could cause an exact-content assertion to fail if the fixture or test normalizes newlines differently.
+- The fixture path must be kept isolated to the issue scope so no protected or unrelated files are changed.
+
+## Implementer - 2026-06-19T09:08:05.861637+00:00
+
+- Summary: Added the requested isolated fixture at `tests/agentic_demo/sample.txt` with the exact three-line content, plus a minimal pytest that reads the file and asserts the full text matches including the trailing newline. Verified with `python -m pytest` and `python -m agentic_loop validate`.
+- Commit message: `Add isolated demo text fixture and exact-content test`
+
+### Files changed
+- `tests/agentic_demo/sample.txt`
+- `tests/test_agentic_demo_fixture.py`
+
+## Validation - 2026-06-19T09:08:29.947508+00:00
+
+- Status: passed
+
+### Commands
+- `python -m pytest` exited `0`
+- `python -m agentic_loop validate` exited `0`
+
+## Reviewer - 2026-06-19T09:08:53.072832+00:00
+
+- Cycle: 0
+- Review status: approved
+- Summary: The branch satisfies the issue: it adds `tests/agentic_demo/sample.txt` with the exact three lines and a minimal pytest that checks the full file contents. Validation is appropriate and passes (`python -m pytest` and `python -m agentic_loop validate`).
+- Policy decision: approved
+- Decision reason: review approved
+
+### Findings
+- None.
+
+## Orchestrator - 2026-06-19T09:09:07.113189+00:00
+
+- Phase: human-review
+- Handoff reason: review approved
diff --git a/tests/agentic_demo/sample.txt b/tests/agentic_demo/sample.txt
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index 0000000..85c3040
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+++ b/tests/agentic_demo/sample.txt
@@ -0,0 +1,3 @@
+alpha
+beta
+gamma
diff --git a/tests/test_agentic_demo_fixture.py b/tests/test_agentic_demo_fixture.py
new file mode 100644
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+++ b/tests/test_agentic_demo_fixture.py
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+from pathlib import Path
+
+
+def test_agentic_demo_fixture_contents():
+    fixture = Path(__file__).parent / "agentic_demo" / "sample.txt"
+    assert fixture.read_text(encoding="utf-8") == "alpha\nbeta\ngamma\n"