memory: snapshot — R49 1-epoch pilot complete and awaiting adjudication; MeroMero A4B quantized, v2 blocked; althing 3.6.2 rolled

Ships the two pending code changes alongside the memory that describes them:
train_voice_lora.py gains --eval-steps/--save-steps (the 3-epoch pilot overfit
with per-epoch eval and save_strategy="no", so the minimum was neither visible
nor recoverable), and the althing post-office compose is pinned to 3.6.2.

Index rewritten: in-flight compressed from 176 lines to the live state, three
detail files added for R49 D1-D3, the MeroMero four-failure chain, and the
althing rollout. Seven closed pre-08-27 entries archived; the guards held back
the rest because they carry open deferred pointers.

stacks/althing-post-office/compose.yaml

@@ -51,7 +51,7 @@ services:
     # Digest-pinned, not tag-floating: `:3.0.0` is a mutable pointer on a registry
     # anyone can re-push, and this container is the fleet's whole message bus. The
     # tag is kept alongside the digest purely so a human can read what it is.
-    image: gitea.phasefinal.com/claude-bot/althing-post-office:3.6.0@sha256:13158835488a8ec04f990c97c4f4c68f1d923b12494319cf07392552e68f8a78
+    image: gitea.phasefinal.com/claude-bot/althing-post-office:3.6.2@sha256:9bf9808eb54ed828ac1ae2e18a2021d9ffcca60bf25dc8a51b4fc5a2b2960c77
     container_name: althing-post-office
 
     # ─── Host networking, so the bind guard keeps working ────────────