Temporal: fix expected publication year

Fix html entity

Thenable Curtailment to stage 2, per 2026.03.12 TC39

Fix table formatting on finished-proposals.md

Add nonextensible-applies-to-private test262 link

Add missing test262 column to Import Text

Import Text to stage 3, per 2023.03.11 TC39

Import Text to stage 2.7, per 2023.03.11 TC39

Temporal to stage 4, per 2026.03.11 TC39

Iterator Includes to stage 2.7, per 2026.03.10 TC39

Iterator Includes to stage 2, per 2026.03.10 TC39

Iterator Includes to stage 1, per 2026.03.10 TC39

Withdrawing Dynamic Import Host Adjustment, per 2026.03.10 TC39

Error Stack Accessor to stage 2.7, per 2026.03.10 TC39

Intl Era and MonthCode to stage 4, per 2026.03.10 TC39