diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4de53e0..b642b6b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,24 @@ cut and that this clone does not carry.
 
 ## [Unreleased]
 
+## [0.0.78] - 2026-09-27
+
+OpenCode now declares `detach_instruction_region`, the second half of
+the instruction-region lifecycle: it removes only the marked
+`:::begin-ai-stp`/`:::end-ai-stp` section, keeps every byte outside the
+markers — including YAML frontmatter the product owns — deletes a file that
+held only the attachment, no-ops when none is attached, and refuses
+ambiguous markers or a plan whose surface changed since it was made. The
+consumer shipped the reader first (provider-kit 0.2.14 in ai-stp-cli
+0.0.32); this release is the writer.
+
+`status` gains the optional `instruction_region` member: `null` where the
+product declares no instruction surface, else the surface path, file
+presence, section presence and the marked section's own digest — kept out
+of `target_digest` and read as "no well-formed section" rather than an
+error when markers are ambiguous. Provider protocol version, postures and
+ownership are unchanged.
+
 ## [0.0.77] - 2026-09-27
 
 All seven setup systems refresh their software pins from current vendor
diff --git a/Cargo.lock b/Cargo.lock
index 47cddf7..aa35b38 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -66,7 +66,7 @@ checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
 
 [[package]]
 name = "harness-runtime"
-version = "0.0.77"
+version = "0.0.78"
 dependencies = [
  "provider-v3",
  "serde",
@@ -128,7 +128,7 @@ dependencies = [
 
 [[package]]
 name = "opencode-setup-system"
-version = "0.0.77"
+version = "0.0.78"
 dependencies = [
  "harness-runtime",
  "provider-v3",
@@ -147,7 +147,7 @@ dependencies = [
 
 [[package]]
 name = "provider-v3"
-version = "0.0.77"
+version = "0.0.78"
 dependencies = [
  "serde",
  "serde_json",
@@ -209,7 +209,7 @@ dependencies = [
 
 [[package]]
 name = "setup-core"
-version = "0.0.77"
+version = "0.0.78"
 dependencies = [
  "miniz_oxide",
  "serde",
diff --git a/Cargo.toml b/Cargo.toml
index f8faf61..63a1866 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,7 +8,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.0.77"
+version = "0.0.78"
 edition = "2024"
 rust-version = "1.89"
 license = "AGPL-3.0-or-later"
@@ -23,9 +23,9 @@ sha2 = "0.11"
 # `setup-core::archive`); an inflate loop is not, because its bugs are
 # memory-safety bugs and it is not improved by being hand-written here.
 miniz_oxide = "0.9"
-setup-core = { path = "crates/setup-core", version = "0.0.77" }
-provider-v3 = { path = "crates/provider-v3", version = "0.0.77" }
-harness-runtime = { path = "crates/harness-runtime", version = "0.0.77" }
+setup-core = { path = "crates/setup-core", version = "0.0.78" }
+provider-v3 = { path = "crates/provider-v3", version = "0.0.78" }
+harness-runtime = { path = "crates/harness-runtime", version = "0.0.78" }
 
 [workspace.lints.rust]
 unsafe_code = "forbid"
diff --git a/README.md b/README.md
index 9238e81..78191e3 100644
--- a/README.md
+++ b/README.md
@@ -179,7 +179,7 @@ release is a convenience, not the authorised copy.
 
 ```bash
 docker run --rm -v "$HOME/.config:/config" \
-  ghcr.io/nddev-opennetwork/opencode-setup-system:0.0.77 \
+  ghcr.io/nddev-opennetwork/opencode-setup-system:0.0.78 \
   status --target /config/<dir> --json
 ```
 
diff --git a/install.ps1 b/install.ps1
index 958d812..9476922 100644
--- a/install.ps1
+++ b/install.ps1
@@ -7,7 +7,7 @@
 #   powershell -ExecutionPolicy Bypass -File install.ps1 -Version 0.1.0
 [CmdletBinding()]
 param(
-  [string]$Version = "0.0.77",
+  [string]$Version = "0.0.78",
   [string]$InstallDir = "$env:LOCALAPPDATA\Programs\opencode-setup-system"
 )
 $ErrorActionPreference = "Stop"
diff --git a/install.sh b/install.sh
index cef7fa9..1e9ed3a 100644
--- a/install.sh
+++ b/install.sh
@@ -14,7 +14,7 @@ set -eu
 
 REPO="NDDev-OpenNetwork/opencode-setup-system"
 BINARY="opencode-setup-system"
-VERSION="${1:-0.0.77}"
+VERSION="${1:-0.0.78}"
 PREFIX="${OPENCODE_INSTALL_DIR:-$HOME/.local/bin}"
 
 case "$(uname -s)" in