chore: release v0.8.1 (#160)

Cuts v0.8.1 carrying the post-v0.8.0 Mythos delta-pass sweep on the 8
Tier-5 files unscanned at v0.8.0 cut time (per #151 gate scope).

Ten loss scenarios closed across 6 fix PRs, all of them silent (no
host trap, no validator rejection — wrong-by-construction outputs):

- LS-A-11 (#152) — extended-const init/offset truncation in segments
  and global initializers. Folds (i32.const x)(i32.const y) i32.add
  instead of dropping operands after the first.
- LS-A-12/13/14 (#153) — p3-async detection bugs: mixed-mode stackful
  mis-classification, stream-write over-count silently classified as
  Complete, future<stream<...>> mis-routed to stream_types via
  substring match.
- LS-A-15 (#154) — HashMap.iter().find non-determinism at three sites;
  realloc and resource-rep/-new fallbacks now sort candidate keys.
- LS-A-16 (#159) — wrapper dropped source canonical options for lifts;
  every export silently received the first lift's string encoding.
- LS-A-17/18/19 (#156) — resource_graph definer purge and terminal-
  exporter pass ignored the iface dimension; merger dedup used
  ends_with(rn) where exact match was required (float / bigfloat
  suffix collision).
- LS-A-20 (#157) — flags<N> canonical ABI silently modeled as
  Record<N x Bool>; new ComponentValType::Flags variant with explicit
  arms in every canonical-ABI helper.

Also under Added: the Mythos delta-pass CI gate workflow (#151) that
made this sweep observable at PR time, and the stackful async-lift
cross-memory (ptr, len) return path that v0.8.0 had errored out on.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: avrabe

CHANGELOG.md

@@ -4,8 +4,27 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
+## [0.8.1] — 2026-05-16
+
 ### Fixed
 
+- **Extended-const initializer / offset truncation** (LS-A-11, UCA-M-6,
+  H-1 / H-2 / H-3.3). Two const-expression parsers in meld-core read
+  only the first operator and discarded the rest, silently truncating
+  any wasm 2.0 `extended-const` expression. A data / element segment
+  with offset `(i32.const 5)(i32.const 10) i32.add` landed at offset 5
+  instead of 15; a global initialized to `(i32.const 100)(i32.const 23)
+  i32.add` (intended 123) was emitted as 100. Affected
+  `segments.rs::parse_const_expr_with_value` (data + element offsets)
+  and `merger.rs::convert_init_expr` (global initializers). Fix
+  introduces shared `fold_extended_const_i32` /
+  `fold_extended_const_i64` helpers that walk all operators with a
+  small stack-machine interpreter (i32/i64 add/sub/mul with wrapping
+  semantics) and return the folded scalar. Regression pinned by 6
+  tests covering all three arithmetic ops and the single-const
+  passthrough. Surfaced by the post-v0.8.0 Mythos delta-pass sweep on
+  the remaining 8 Tier-5 files (the protocol introduced in #151).
+
 - **Resource graph + merger key-matching bugs** (LS-A-17, LS-A-18, LS-A-19;
   UCA-F-2 / UCA-M-9). Four sites in `meld-core` either dropped the
   interface dimension of `(component, interface, resource_name)` tuples

Cargo.lock

@@ -10,7 +10,7 @@ exclude = [
 ]
 
 [workspace.package]
-version = "0.8.0"
+version = "0.8.1"
 authors = ["PulseEngine <https://github.com/pulseengine>"]
 edition = "2024"
 license = "Apache-2.0"