docs(initial-implementation): close phase 0 tracking, log phase 8 amendment

plans/initial-implementation/PLAN.md

@@ -62,7 +62,7 @@ parameter configurable.
 
 | Phase | Domain | Status | Review | Build | Committed |
 |---|---|---|---|---|---|
-| Phase 0: Scraping spike | backend | ✅ Done | ⬜ Pending review | ⏭️ N/A (research) | ⬜ |
+| Phase 0: Scraping spike | backend | ✅ Done | ⚠️ Pass with notes (Sonnet) | ⏭️ N/A (research) | ✅ 070e34b |
 | Phase 1: Solution + Domain | backend | ⬜ Not Started | ⬜ | ⬜ | ⬜ |
 | Phase 2: Storage | backend | ⬜ Not Started | ⬜ | ⏭️ Big Bang | ⬜ |
 | Phase 3: Scraping | backend | ⬜ Not Started | ⬜ | ⏭️ Big Bang | ⬜ |
@@ -84,4 +84,29 @@ parameter configurable.
 
 ## Amendment Log
 
-(empty)
+### Amendment 1 — 2026-05-05 — Phase 8 strategy change (deferred — formal approval will be requested when Phase 8 begins)
+
+**Type:** Modify upcoming phase (Phase 8 — Results loader)
+**What changed:** Phase 8's original subplan assumed marathonbet.by exposes a public
+results / archive page that we can scrape to back-fill `EventResult`s. Phase 0 spike
+proved this endpoint does NOT exist (`/su/results` returns 404).
+
+**Why:** Spike findings — see `spike/SCRAPE_FINDINGS.md` and the deviation note in
+`plans/initial-implementation/phase-0-scraping-spike.md` (Handoff section).
+
+**New approach (to be formalised when Phase 8 begins):** Maintain a "watch list" of
+events whose `ScheduledAt + EstimatedDuration` is in the past but whose status is not
+`Completed`. Poll those event-detail URLs every 5 min until either
+`eventJsonInfo.matchIsComplete=true` (capture `resultDescription`, mark complete) or
+the URL 404s (mark `ResultUnknown`). Optional fallback to flashscore/sofascore is a
+Phase 8 design decision.
+
+**Impact on existing phases:** Phase 4 (Application + Workers) may need a new
+`ResultsWatchListPoller : BackgroundService` in addition to the previously planned
+`UpcomingEventsPoller` and `LiveOddsPoller`. Phase 2 schema may need a `WatchStatus`
+field on `Event` (`Pending | InWatchList | Completed | ResultUnknown`). Both will be
+re-evaluated when Phase 8 starts.
+
+**Status:** Logged — formal subplan revision and user approval will be requested at the
+start of Phase 8 (per skill rule: "All amendments require explicit user approval before
+taking effect"). Phases 1–7 do not depend on Phase 8's tactical implementation.