diff --git a/.dev/STATE.md b/.dev/STATE.md
index 1901ea88..7a30db6d 100644
--- a/.dev/STATE.md
+++ b/.dev/STATE.md
@@ -13,6 +13,14 @@ Roadmap detail lives in [PLAN.md](PLAN.md), not here.
 
 ## Recently landed
 
+- **v0.20.0** (2026-07-21) — #128 closed #119 + #65: structural parity guard on every write
+  path (directive shapes byte-equal or presence-matched by class; anchors exact). Calibrated
+  empirically: byte-equal draft over 211 real pairs → 362 false positives in 3 classes
+  (contents/index titles, prf:* titles, code-cell kernel tags) → calibrated guard passes
+  200/211, remainder pending-drift artifacts. Found live damage during calibration: sympy.fr
+  dropped (sympy)= anchor (restored, .fr#16). First wave after this may loudly fail files
+  with pre-existing anchor damage — that is the guard working the backlog. Next P0 item:
+  round-trip invariant (#94 Phase 2); nested-directive coverage belongs there.
 - **v0.19.0** (2026-07-21) — #124 closed #123: `rebase-stale-siblings` (default off) refreshes
   non-overlapping sibling PRs during waves via update-branch — no re-translation, message-gated
   422s. **Harness-validated pre-release** under the harness-first policy: pinned workflow to the
diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
index 3ffef49a..797f7b46 100644
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -9,7 +9,7 @@
 - **Review Mode**: Runs in TARGET repo, posts quality review comments on translation PRs
 - **Rebase Mode**: Runs in TARGET repo, rebases conflicted translation PRs when a sibling PR is merged
 
-**Current Version**: v0.19.0 | **Tests**: 1,153+ (49 suites; exact count in CI) | **Glossary**: 357 terms (zh-cn, fa, fr)
+**Current Version**: v0.20.0 | **Tests**: 1,173+ (50 suites; exact count in CI) | **Glossary**: 357 terms (zh-cn, fa, fr)
 
 ---
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7c23b0a5..9717025b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.20.0] - 2026-07-21
+
+### Added
+- **Structural parity guard on every write path** (#119, #65 — first item of the #120 P0 plan): the silent-corruption class (#118, #119, #65) is structural MyST mutated by a path that should have passed it through verbatim, with the run reporting success every time — eight instances to date, every one discovered weeks later on a downstream strict build. Sync (markdown and renamed-file handlers) and forward resync (post-finalization, checking exactly the bytes that would be written) now extract the structural tokens — top-level fenced-directive openings and `(label)=` target anchors — from source and output, and **fail the file loudly on divergence**. Directive name sequences must match (#118's fence-wrap collapses the sequence and fails on count); structural arguments (`{raw}` format, `{include}`/`{figure}` paths, `{solution}`'s exercise label) must match byte-for-byte (#119's defect); flexible arguments — `{admonition}`/`{prf:*}` titles, `{contents}`/`{index}` display text, `{code-cell}`'s edition-pinned kernel tag — need only presence to match, though a dropped argument still fails; anchor sequences must match exactly, with multiset-diff diagnostics that name dropped or surplus labels (#65). The rules were **calibrated against the real corpus**: a byte-equal-everything draft dry-run over all 211 source/target lecture pairs across five editions produced 362 false positives in exactly the three flexible-arg classes, and the calibrated guard passes 200/211 (the rest are pending-drift artifacts of current-vs-current comparison, which the guard never performs in situ). The dry-run also found live production damage — `sympy.fr` had dropped its `(sympy)=` anchor, restored in lecture-python-programming.fr#16. **Operational note**: files whose *historical* translations already dropped anchors will fail their next sync until repaired — loud by design; resync is the repair tool. Scanning is a top-level stateful fence walk (nested directives are #94 Phase 2's round-trip territory); the guard lives in `src/structural-parity.ts` per the rule that guards go in modules Jest can load.
+
+### Fixed
+- Docs and template comments name the CLI invocation correctly as `translate forward --github` (#127) — the bare `forward --github` is not a runnable command.
+
 ## [0.19.0] - 2026-07-21
 
 ### Added
diff --git a/package-lock.json b/package-lock.json
index 35342897..aab2efd7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "action-translation",
-  "version": "0.19.0",
+  "version": "0.20.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "action-translation",
-      "version": "0.19.0",
+      "version": "0.20.0",
       "license": "MIT",
       "dependencies": {
         "@actions/core": "^2.0.3",
diff --git a/package.json b/package.json
index fc0bd167..2c9f5d3b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "action-translation",
-  "version": "0.19.0",
+  "version": "0.20.0",
   "private": true,
   "type": "module",
   "description": "GitHub Action to sync and review translations across repositories",