release: v2.6.0 — pi-devbox CLI parity + bg-subagents default + opencode 1.17.13 → 1.17.15

- opencode 1.17.13 → 1.17.15 (OPENCODE_VERSION in Dockerfile.variant)
- promote CHANGELOG Unreleased → v2.6.0 (2026-07-08) with opencode release notes
- (base-hash-advancing changes already staged in prior two commits: CLI tools + bg-subagents ENV)

AGENTS.md tag/variant/skill counts verified unchanged; DOCKER_HUB.md in sync.

CHANGELOG.md

@@ -6,11 +6,15 @@ Tags follow **independent semver** (since `v2.0.0`) — they version *this image
 
 ---
 
-## Unreleased
+## v2.6.0 — 2026-07-08
 
-CLI-toolset parity with the sibling `pi-devbox` image, plus background-subagent
+Minor release. Headline: **CLI-toolset parity with the sibling `pi-devbox`
-enablement. Touches `Dockerfile.base` (apt list, new binary, new ENV) so the
+image** (adds `yq`, `pandoc`, `graphviz`, `tealdeer`/`tldr`, and the `dot-watch`
-base image rebuilds (`base-<hash>` advances).
+wrapper) plus **background subagents enabled by default**
+(`OPENCODE_EXPERIMENTAL_BACKGROUND_SUBAGENTS=true`), and an opencode bump
+`1.17.13 → 1.17.15`. Touches `Dockerfile.base` (apt list, new binary, new ENV)
+so the base image rebuilds (`base-<hash>` advances); the opencode bump rebuilds
+the variant layers.
 
 ### Added
 
@@ -33,6 +37,17 @@ base image rebuilds (`base-<hash>` advances).
   promotes it out of experimental (no upstream roadmap date as of opencode
   1.17.15 / omos 2.1.0).
 
+### Changed
+
+- **opencode `1.17.13` → `1.17.15`.** v1.17.14 adds a code-mode MCP adapter for
+  confined orchestration scripts, hides the `execute` tool unless code mode is
+  enabled, and **fixes paginated MCP tool catalogs losing tool metadata +
+  output-schema validation** (relevant — this image wires the mempalace,
+  gitea-mcp, and context7 MCP servers). v1.17.15 is bugfixes + desktop/TUI UX
+  (Z.ai context-overflow error classification, macOS Sequoia titlebar, model
+  picker). No breaking changes. Release notes:
+  <https://github.com/anomalyco/opencode/releases>.
+
 ---
 
 ## v2.5.0 — 2026-07-02

Dockerfile.variant

@@ -39,7 +39,7 @@ ARG USER_NAME=developer
 # edit, so the cache-hit class of bug that bit pi-devbox v0.74.0..
 # v0.75.5 cannot apply here.
 ARG INSTALL_OPENCODE=true
-ARG OPENCODE_VERSION=1.17.13
+ARG OPENCODE_VERSION=1.17.15
 RUN if [ "${INSTALL_OPENCODE}" = "true" ]; then \
       NPM_CONFIG_PREFIX=/usr npm install -g opencode-ai@${OPENCODE_VERSION} && \
       opencode --version ; \