--summary-out puts skip reasons in the `proven` column

[jordonpeterson]

Severity: low. Found by a platform-engineer user test. Pre-existing; the table is rendered by renderSummary.

The Ops table header is | id | op | status | proven | note |, and the proven cell is overloaded: it holds tree / structural normally, but a skip reason when there is one.

| `ops[3]` | `add_owner(**/*.tf, @acme/infra)` | skipped | scope "**/*.tf" matches zero tracked files and on_zero_match=skip (R-21) | terraform wherever it lives |

Across a hundred near-identical PRs this puts a long sentence in the column a reviewer scans for one of two short words.

Suggested fix

Give the reason its own column, or move it under the table.