release: v0.8.2 — extension vault-creation fix (binary transport)

Extension-only patch: fixes vault create/attach in the browser extension, where
chrome.runtime.sendMessage silently dropped ArrayBuffer payloads (carrier JPEG →
0 bytes → opaque "no SOF marker found in JPEG"). See CHANGELOG for the full set.

- Version bumps: extension 0.7.0→0.8.2 (it had no changes in 0.8.0/0.8.1);
  relicario-core/-cli/-wasm 0.8.1→0.8.2 for unified-tag consistency. The Rust
  core/CLI are functionally unchanged from v0.8.1. relicario-server stays 0.1.1
  (independent version line; no functional change).
- CHANGELOG.md: v0.8.2 section. STATUS.md / ROADMAP.md: v0.8.2 landed, v0.9.0
  flagged as ready to kick off.

Verify: cargo build/test/clippy -D warnings all green (35 test binaries);
extension 435/435 vitest, build:all clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Pe8qw5KePDqAEBsAxnVQuJ

Cargo.lock

@@ -2156,7 +2156,7 @@ checksum = "dc897dd8d9e8bd1ed8cdad82b5966c3e0ecae09fb1907d58efaa013543185d0a"
 
 [[package]]
 name = "relicario-cli"
-version = "0.8.1"
+version = "0.8.2"
 dependencies = [
  "anyhow",
  "arboard",
@@ -2188,7 +2188,7 @@ dependencies = [
 
 [[package]]
 name = "relicario-core"
-version = "0.8.1"
+version = "0.8.2"
 dependencies = [
  "argon2",
  "base64",
@@ -2235,7 +2235,7 @@ dependencies = [
 
 [[package]]
 name = "relicario-wasm"
-version = "0.8.1"
+version = "0.8.2"
 dependencies = [
  "base64",
  "ed25519-dalek",