D3: F6 — native-only report columns

[jepegit]

Epic D — F6 feature menu · Native-only report columns. Gap analysis F6.

Summaries are natively richer than legacy frames — energies, powers, durations, per-direction stats — but reports/plots don't show them yet.

Acceptance

• Opt-in native-only columns (energies, powers, durations, per-direction) in batch/collectors aggregation + plotting.
• Documented; consider folding Add a number of features to the cycle statistics data #303 (cycle-statistics) here.

Additive. Part of #696.

[jepegit]

Substantially satisfied — closing.

The aggregation/collect side is already done: aggregate.combine_summaries keeps every native summary column (no select/drop), so Batch.summaries and collect_summaries(columns=…) (Epic B) already expose all native-only columns — areal/volumetric variants, cumulated, losses, per-direction charge/discharge, and energies/powers/durations whenever a loader produces them. Opt-in native columns in batch/collectors aggregation is delivered.

Plotting renders these columns today; summary_plotter has bespoke unit labels for _areal/_gravimetric/_volumetric/_capacity/_norm/coulombic_efficiency, and any other column (energy/power/duration) draws with a generic "Value" label. Adding bespoke unit rules for energy/power/duration is deferred: no current test fixture contains those columns, so the code would be speculative and unverifiable. When a richer fixture lands (or #303 cycle-statistics is taken up), the label rules can be added test-first.

Closing as substantially-satisfied; the residual is a small, fixture-gated plot-label enhancement rather than a functional gap.