docs(m011): record MVP balance and acceptance evidence

docs/PLAYTEST_REPORT.md

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+# Milestone 011 playtest report
+
+## Protocol
+
+Run representative completed two-player matches on the target ESP32-C6 with
+the locked configuration in `docs/BALANCE_REPORT.md`. Use two active players
+and, where practical, one observer. Do not impose a time limit or coach a
+route. Start timing when the authoritative countdown completes and stop at the
+authoritative result. A draw, reconnect timeout, abandoned match, or technical
+failure is recorded separately and does not count as a completed match.
+
+For each completed match, record the maze seed or map hash, both players'
+experience level, winner or draw, elapsed time, whether either player used a
+vision artifact or compass, and any gameplay defect. Do not record session
+tokens, Wi-Fi passwords, or other credentials.
+
+Use at least five completed matches involving more than one pair of players.
+The target is that ordinary completed matches cluster around five minutes;
+there is deliberately no hard timer. If a result materially misses that target
+or a participant reports a balance issue, describe it and repeat the affected
+tests after any parameter change.
+
+## Results
+
+No representative completed human matches have been recorded yet.
+
+| Run | Date | Seed or map hash | Player experience | Result | Elapsed | Artifact / compass use | Defects or balance notes |
+| --- | --- | --- | --- | --- | --- | --- | --- |
+| 1 | Pending | Pending | Pending | Pending | Pending | Pending | Pending |
+| 2 | Pending | Pending | Pending | Pending | Pending | Pending | Pending |
+| 3 | Pending | Pending | Pending | Pending | Pending | Pending | Pending |
+| 4 | Pending | Pending | Pending | Pending | Pending | Pending | Pending |
+| 5 | Pending | Pending | Pending | Pending | Pending | Pending | Pending |
+
+## Assessment
+
+Pending the five completed matches above. This document must state the
+observed range and median, whether the five-minute target was met without a
+timer, and whether any tuning change or approved deviation is required before
+Milestone 011 can be complete.