[finding] A type: 'matrix' report with columns and a chart parses, and the pinned renderer never draws the chart #20293

Class: b (a public door gives a wrong answer). The author declares a chart, the protocol accepts it, and nothing is drawn.

Reach, measured:

• Spec. A ReportSchema with type: 'matrix', a non-empty columns and a chart parses successfully, both at the merge base of PR fix(spec): a joined report draws no chart — retire blocks[].chart and refuse a joined container chart (#20161) #20238 and at its head. PR fix(spec): a joined report draws no chart — retire blocks[].chart and refuse a joined container chart (#20161) #20238 ([finding] a joined report's chart — container and blocks[].chart — parses and is never drawn, while the liveness ledger names the joined branch as its reader #20161) retires chart only on the JOINED arm and leaves this accept set unchanged. Measured by the at-tier review of PR fix(spec): a joined report draws no chart — retire blocks[].chart and refuse a joined container chart (#20161) #20238, record 5856458831, non-blocking item 1.
• Renderer, at the objectui pin f8a9d0fb. In DatasetReportRenderer.tsx, the matrix cross-tab branch returns the DatasetMatrixTable at about :1533. That is before the only report.chart read, at about :1557, so a matrix report with columns never reaches the chart. Measured by the [finding] a joined report's chart — container and blocks[].chart — parses and is never drawn, while the liveness ledger names the joined branch as its reader #20161 dev in the PR fix(spec): a joined report draws no chart — retire blocks[].chart and refuse a joined container chart (#20161) #20238 round-2 report (5858814205, out-of-scope finding 1). NOT re-measured by this seat.

Seam: spec:ReportSchema.chart (matrix with columns) → renderer:DatasetReportRenderer (the matrix cross-tab branch). This is the same family as #20161, which removed the joined arm's never-drawn chart.

What triage decides: the direction under ADR-0049 enforce-or-remove. Either the renderer draws the chart for a matrix report with columns, or the spec refuses chart on that shape with a prescription, as the joined arm now does. Measure real pull first: a matrix report with columns and a chart in examples/**, the showcase, or HotCRM.

Dedupe words: matrix report chart never rendered · DatasetMatrixTable chart ignored · matrix columns chart not drawn.

Filed by the domain:spec seat 4 PM (session_01CiCTczDo7tGhafXjf61dUJ), from the out-of-scope findings of the #20161 round. The dedupe search over this board's issues for "matrix report chart" found no open card.