docs(docs): refresh initial 41 after prp 39 40 (#313)

[w7-mgfcode]

Summary

Patches PRPs/INITIAL/INITIAL-showcase-41-agent-ops-polish.md to remove drift
between INITIAL-41 (authored pre-PRP-39/40) and the actual surfaces PRP-41
consumes on dev. Docs only — no code changed.

Drift items (D1–D7)

#	Was	Now
D1	batch_preset.step.data.completed_count	actual key completed_items (PRP-39 emits completed_items/total_items/failed_items)
D2	rag_index_subset.step.data.chunks_indexed	actual key total_chunks (chunks emitted this run across the curated 5-file subset; curated_hits for files-indexed)
D3	step.data.alias_count	derive total_aliases from len(OpsSummaryResponse.aliases) in ops_snapshot; fall back to step.data.alias keys
D4	"scenario_save / scenario_compare payloads"	actual step names scenario_simulate_and_save (emits scenario_id) + multi_plan_compare (emits winner_scenario_id + ranked)
D5	GET /ops/model-health?grain=store_product&limit=5	actual endpoint takes only ?limit= — no grain param
D6	flat stale_aliases key on /ops/summary	derive from OpsSummaryResponse.aliases[].is_stale; documented response shape (system/jobs/runs/aliases/freshness/attention_items/generated_at)
D7	line-number citations into pipeline.py, service.py, experiment.py, frontend hooks	replaced with symbol refs (::step_agent, ::approve_action, ::tool_save_scenario, ::useDemoPipeline, etc.) so the PRP does not re-stale on the next file expansion

Folded into PRP-41 scope

• Issue fix(ui): unlock showcase phase accordion after completion #311 (fix(ui): unlock showcase phase accordion after completion) — added as polish item 7 in the "Scope" section + acceptance criterion D10. Load-bearing for the Inspect-Artifacts post-run UX: visitors need to re-open any phase post-run, which the current fully-controlled <Accordion value={value}> (no onValueChange) blocks.

Out of scope, but added as PRP-41 prerequisite

• Issue fix(seeder): make phase2 enrichment idempotent #312 (fix(seeder): make phase2 enrichment idempotent) — must land before PRP-41's manual dogfood (the 16-line checklist re-runs showcase-rich against a populated DB; fix(seeder): make phase2 enrichment idempotent #312's IntegrityError → HTTP 500 would block that). Tracked separately.

Test plan

• git diff --check clean
• Only PRPs/INITIAL/INITIAL-showcase-41-agent-ops-polish.md modified (117 insertions / 46 deletions)
• No stray conflict markers
• Commit format: docs(docs): ... (#313) per .claude/rules/commit-format.md
• CI lint/format/typecheck/test gates pass (docs change — only the lint stages relevant)

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