chore(st-w9v): drop counts' eid/epct — two fields with no reader

[dkoosis]

counts.json has shipped eid and epct per repo since the shell script it replaced. Nothing has read either key since wrap 0.28.0 removed the statusline's epic-progress bar. Re-grepped across strand, ~/Projects/sdlc (where the wrap statusline now lives), ~/Projects/cc-plugins and ~/.claude: the writer was the only mention.

What goes

Row.EID / Row.EPct, station(), and the prevEID/prevEPct carry-forward that threaded a prior row's station through computeRow (st-2fy.7). computeRow now takes (ctx, src, root).

What stays

strandmd.Roadmap. The bead as originally filed also called the roadmap parse dead — sd-3wp.1 falsified that half by rewriting it to read ROADMAP.md and giving it live readers (the epic buckets and the what's-next cascade both derive from it). Only the two station fields were reader-less, so the bead was rescoped before this work started.

Why removing keys is safe

The same reason sd-3wp.1's additions were: every consumer decodes by name into its own struct (bdcounts.Reader) or selects named keys (the statusline's jq). A key nobody mentions cannot affect them.

Tests

The JSON-shape test now asserts eid/epct are absent, so restoring them has to be deliberate. Error-path coverage is unchanged — TestComputeRowEpicStatusFailureDegradesEpicsAndNext already pins the EpicStatus-failure branch that the two deleted station tests also touched.

Verified on a live repo: strand counts ~/Projects/sdlc emits neither key, with epics and next intact. make check green.

Closes st-w9v

[coderabbitai]

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