Backlog: record the 2026-09-12 batch

[iamfatness]

Nine items closed and two partial, all shipped in beta-2026-09-12-e1223d3, none live-checked.

T1.12 #475	join-time prompts answered	#493
T1.13 #473	media decoder failures are loud	#494 — observability only
T2.6 #438	packaging spec reconciled	#504
T2.7 #474	one shortcut, uninstall cleans up	#497
T2.8 #469	recordings resolve absolute	#496
T2.9 #466	recording lifecycle survives a stream	#499
T2.10 #468	sender health stops lying	#499
T3.2 #440	WebView2 message	#504
T3.7 #470	ISOs armed with capture off warn	#502
T3.8 #482	ISO frames conform to the writer	#503
T2.1 #433	partial — WER dumps are HKLM-only
T3.5 #476	partial — the rest is a product call

Each row keeps the thing that's expensive to rediscover rather than just a tick: T2.8 records that the issue's premise was wrong, T3.8 records that its end-to-end test is a guard passing either way, T2.6 records that dropping MSIX cost auto-update, and T2.1 records the measurement proving a per-user installer cannot enable crash dumps.

Tier 1 now has one open item, waiting on a decision rather than effort. T1.11 step 1 needs a change to the Take path itself, because a plain cut never captures the outgoing scene — written into the row so the next session doesn't rediscover it and ship it blind.

Two entries came from the work rather than the list: #505 (per-layer border controls are vestigial — the core forces borderStyle="none" on every route layer) and the T1.11 ruling.

The header now says the honest thing: the binding constraint is T0.1 and a live check, not engineering capacity.

🤖 Generated with Claude Code

https://claude.ai/code/session_014yuH7EMvWCWdkhvevrtMyJ