docs(repo): track showcase-completion e1-e5 prps (#406)

[w7-mgfcode]

Summary

Tracks five execution-ready PRPs for the showcase-workspace-completion umbrella #406:

• PRPs/PRP-showcase-completion-E1-metadata-provenance-backbone.md — epic feat(api,db): showcase-completion E1 — workspace metadata & provenance backbone (migration + jsonb story slots + patch lifecycle endpoint) #407 (Foundation)
• PRPs/PRP-showcase-completion-E2-safe-replay-lifecycle.md — epic feat(api,ui): showcase-completion E2 — safe replay & workspace lifecycle (confirm/diff, lineage, rename/archive/pin/tags, search, compare, link health) #408
• PRPs/PRP-showcase-completion-E3-seed-config-scope.md — epic feat(api,ui): showcase-completion E3 — advanced seed config mvp + store/product scope selection #409
• PRPs/PRP-showcase-completion-E4-run-config-phase-controls.md — epic feat(api,ui): showcase-completion E4 — run-config phase controls (model set + backtest params in start frame) #410
• PRPs/PRP-showcase-completion-E5-agent-rag-story-capture.md — epic feat(api,ui): showcase-completion E5 — agent/hitl + rag story capture (approval history + reject + rag events) #411

E1–E3 passed two prp-quality-agent validation rounds; round-2 blocking findings were amended in-document (E1: explicit-null rejection on archived/pinned/tags in the PATCH body blueprint, runtime-verified on the installed pydantic; E3: workspaceToRunRequest now preserves E1's replayed_from_workspace_id replay provenance). E2/E3 embed CONTRACT(E1)-tagged assumptions cross-checked against the E1 PRP, with built-in post-E1-merge reconciliation tasks gating execution.

Docs only — no code, schema, or config changes.

Checklist

• Commit format type(scope): description (#issue) referencing open issue feat(api,ui): showcase workspace completion — the forecastlab control story #406
• Branch docs/<kebab-slug> off dev
• No code paths touched — validation gates unaffected

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