TASK 4 ship step 5.5: social bar bug fixes + bar on the live output — direction-snap drag (SocialBarSnap.Decide + ClearValue, local Canvas.Top was overriding the binding), fediverse nodeinfo subdomain probing + load-time heal (settable FediverseSoftware), SocialBarRenderer strip blitted above the flash via a re-read FramePump socialBar seam — 155 tests passing, 0 warnings

HANDOFF.md

@@ -7,18 +7,29 @@
 
 ## Session state (last updated: 2026-08-13)
 
-- **Branch:** `main`. TASK 4 ship step 5 (the live frame pipeline) is **shipped
-  and committed** — the `FramePump` frame producer
-  (`Services/Encoder/FramePump.cs`), `ScreenCaptureManager.GetLatestFrame(key)`,
-  the `MainViewModel` resolver/option-builders/pump lifecycle wiring, `FramePumpTests`
-  (7) + the `GetLatestFrame` test (1), and the memory updates (TASKS.md, ai.md,
-  Services/index.md — the previous session left `Services/index.md` stale and
-  HANDOFF unrewritten; both were fixed before the commit). Build **0 warnings**,
-  **147 tests passing**. A Windows patch reboot killed the prior session right
-  after the work was verified but before the commit.
-- **Finished this session:** ship step 5 (re-verified: 0 warnings, 147/147 pass),
-  the `Services/index.md` FramePump row + de-stale'd encoder rows, and this
-  HANDOFF rewrite.
+- **Branch:** `main`. TASK 4 **ship step 5.5 is implemented, tested, and staged for
+  commit** — the social bar bug-fix branch (drag snap + fediverse heal + the bar on
+  the live output). Uncommitted: the feature work, tests (+8 → 155), and the memory
+  updates in TASKS.md / ai.md / Services/index.md / this file. Next action is
+  `git add` + commit + push (feature + its memory docs in ONE commit, per the
+  working rules).
+- **Finished this session:** both reported bugs diagnosed to root cause and fixed;
+  compositor rendering of the social bar added per user approval.
+  - **Bug 1 — drag didn't snap:** `Canvas.SetTop` set a local value that permanently
+    overrides `{Binding SocialBarTop}`; the release-time snap could never win. Fixed
+    with `SocialBarSnap.Decide` (direction-snap during drag, ±6px deadzone) +
+    `bar.ClearValue(Canvas.TopProperty)` on release.
+  - **Bug 2 — Mastodon showed the generic honeycomb:** `@gramps@llamachile.tube`
+    had `Software = NULL` (nodeinfo only ever asked of the landing-page domain).
+    Fixed via subdomain probing (`mastodon.` → `social.` → … candidates, ~15s
+    budget), a load-time heal (`MainViewModel.HealFediverseSoftwareAsync`), and a
+    settable `SocialEntry.FediverseSoftware` that raises `LogoData`.
+  - **Compositor bar:** `Services/Compositor/SocialBarRenderer.cs` (new, WPF
+    RenderTargetBitmap → straight-alpha strip), `SceneCompositor` blits it above
+    the flash, `FramePump` gains a re-read-each-frame `socialBar:` seam,
+    `MainViewModel` owns the strip frame.
+- **Verified:** Windows-host build **0 warnings**; **155/155 tests passing**
+  (147 baseline + 8 new). Full commit contents pending.
 - **Landmines:**
   - The pump reads the active scene on a background thread while the UI can still
     edit it — a concurrent-mutation exception is contained (logged + `Failed` +
@@ -31,11 +42,18 @@
     delay can run the first iteration synchronously on the caller's thread).
   - `StartAsync` never throws; the VM fires-and-forgets it. `Failed` while live
     flips `StreamStatus.Error` (minimal — real health surfacing is ship step 6).
+  - The heal runs off the UI thread and applies via the dispatcher; a config swap
+    mid-heal (dialog Save) can orphan the healed values on the old entries — harmless
+    (best-effort, re-healed next load).
   - Tests never instantiate `MainViewModel` directly except the round-clip
     integration test (a real `MainWindow`), which never goes live — keep it that way.
-- **Next step:** TASK 4 ship step 6 — health stats: bind `FramePump.HealthUpdated`
+  - Sandbox can't reach outbound HTTPS — the subdomain-probe logic is verified via
+    stub-handler tests only, not against the real `mastodon.llamachile.tube`.
+- **Next step:** commit + push ship step 5.5 (one commit incl. memory docs). Then
+  TASK 4 ship step 6 — health stats: bind `FramePump.HealthUpdated`
   (bitrate/FPS/duration) into the bottom bar. Nothing else queued — do not expand
-  the task queue on your own.
+  the task queue on your own. Optional, not queued: rewriting the healed entry's
+  `ProfileUrl` to `https://mastodon.llamachile.tube/@gramps` (user must say the word).
 
 - **Secret/DB/port facts live:** OAuth client id/secret in `Helpers/OAuthCredentials.cs`;
   OAuth session token in `Helpers/TokenStore.cs` (DPAPI → `%APPDATA%\ytLlive\ytLlive.auth`);