docs(internal): update HEAD + fork pin + GA session log (#74/#65 closed, #78/#79 opened)

Author: Reiers

internal-notes/ARCHITECTURE-OVERVIEW.md

@@ -1,8 +1,14 @@
 # Curio Core — Architecture Overview
 
-_Ground-truth map, read top-to-bottom 2026-06-15 from local clone at HEAD `b896437`.
+_Ground-truth map, read top-to-bottom 2026-06-15 from local clone at HEAD `ab03802`.
 Single source for "how everything ties together." Keep current._
 
+_Session 2026-06-15 PM: GH numbering note — internal-notes "C#NN" ≠ GitHub issue NN.
+Go by GitHub numbers. Closed this round: #74 (gossipsub head-tracking verified),
+#65 (pdp_data_sets failure-count drift). Opened: #78 (revert-only ChainNotify
+ERROR noise), #79 (re-arm prove_at_epoch on drift-recovered datasets). Fork HEAD
+moved a97f1c48 → 04532a3f (proofClearsLocalFailure + tests)._
+
 ## One-line
 
 One static Go binary (`CGO_ENABLED=0`, ~102MB) that is a complete Filecoin
@@ -118,8 +124,15 @@ window. Randomness from Lantern's locally-validated DRAND beacons
 ## Forks
 
 - **Reiers/curio** (`projects/curio-fork/`, branch `adopt-pr1245-pullpiece-refactor`,
-  HEAD `c6c6dfd5`). origin=Reiers/curio (push OK), upstream=filecoin-project/curio
-  (push DISABLED by URL trick). curio-core pins this via go.mod replace.
+  HEAD `04532a3f`). origin=Reiers/curio (push OK), upstream=filecoin-project/curio
+  (push DISABLED by URL trick). curio-core pins this via go.mod replace
+  (`v1.27.3-0.20260615104018-04532a3f1b40`). **Bump workflow:** edit fork →
+  commit+push branch → grab `git rev-parse HEAD | cut -c1-12` +
+  `TZ=UTC git show -s --format=%cd --date=format-local:%Y%m%d%H%M%S HEAD` →
+  hand-edit curio-core go.mod replace pseudo-version `v1.27.3-0.<time>-<short12>`
+  → `GOFLAGS=-mod=mod GOPRIVATE=github.com/Reiers/* go mod tidy` → build.
+  (`go get` won't resolve it — the module path is filecoin-project/curio but the
+  commit lives on Reiers/curio; edit the replace line directly.)
 - **Reiers/blooms** (was Reiers/lotus) — storage/paths CGo carve-out.
 
 ## Where to look first per issue class