Bump opencode 1.15.10 -> 1.15.11 + cut v1.15.11

First release on opencode 1.15.11. Also ships the four devbox-side fixes
accumulated since v1.15.10:

  - 668592d Base: SSH ControlMaster default on a writable socket path
  - 73a7f96 Base: gitleaks added; git-crypt confirmed installed
  - 3cbcb44 CI: fix resolve-versions to use curl+jq instead of npm view
  - f7c3409 CI: preventative fix for PI_VERSION/OMOS_VERSION cache-hit regression

Downstream pi-devbox inherits all of these on its next build against
base-latest.

Upstream release notes:
  https://github.com/anomalyco/opencode/releases/tag/v1.15.11

CHANGELOG.md

@@ -8,6 +8,26 @@ Tags follow `v{opencode_version}[letter]` — bare tag for the first build on a
 
 ## Unreleased
 
+_(no changes since v1.15.11)_
+
+---
+
+## v1.15.11 — 2026-05-27
+
+First release on opencode 1.15.11. Also bakes in four devbox-side fixes accumulated since v1.15.10 (SSH ControlMaster on a writable path, gitleaks added to base, CI resolve-versions hardening, CI cache-hit regression fix). Downstream pi-devbox inherits all of these on its next build against `base-latest`.
+
+### Bumped: opencode 1.15.10 → 1.15.11
+
+`OPENCODE_VERSION` ARG bumped in `Dockerfile.variant`. Highlights from the upstream release (full notes: <https://github.com/anomalyco/opencode/releases/tag/v1.15.11>):
+
+- **Core / Improvements** — new `headerTimeout` config for provider requests (10s default for default OpenAI setups); experimental background agents now push updates without polling; remote-backed projects resolve a stable project identity; `modalities.input` / `modalities.output` can be set independently.
+- **Core / Bugfixes** — dynamically added MCP servers now disconnect cleanly on removal; Google tool calling fixed after upstream tool-ID regression; resumed sessions no longer continue orphaned interrupted tools; OpenAI reasoning summaries render as separate blocks; the `shell` tool now advertises its configured timeout to the model; config loading falls back cleanly when user info is unavailable.
+- **TUI** — prompt resizes with terminal width (new prompt-size config); accelerated diff-viewer scrolling; external editors open from the worktree directory when available.
+- **Desktop** — refined v2 home screen, prompt, status popover, and session controls; fixed V2 titlebar errors when a session sync cache was deleted; web deployments no longer run desktop health checks; duplicate server connections are merged.
+- **Extensions** — new `dispose` hook for plugins; Codex plugin now sends the expected session-ID header.
+
+No `opencode-devbox`-side changes were required to consume 1.15.11 — pure version bump.
+
 ### Base: SSH ControlMaster default on a writable socket path
 
 Devboxes typically mount `~/.ssh` from the host as **read-only** (security: keys remain readable but agents can't tamper with config / known_hosts / authorized_keys / plant a malicious ProxyCommand). OpenSSH's default `ControlPath` lands inside `~/.ssh/cm/`, which is unwritable on such mounts — so any attempt to use `ControlMaster auto` (or anything that wants to multiplex) fails with:
@@ -26,6 +46,8 @@ The second line is downstream: when ControlMaster fails the ssh client falls bac
 
 Downstream pi-devbox and any other variant inherits this on its next build against `base-latest`. Discovered while running a recon-shell from inside pi-devbox to a Proxmox node — fresh ssh hit banner timeout, debug output pointed at the read-only socket dir.
 
+_(Originally landed on `main` 2026-05-24 as commit `668592d`; first ships in v1.15.11.)_
+
 ### Base: gitleaks added; git-crypt confirmed already installed
 
 `gitleaks` is now baked into `Dockerfile.base` (Go-compiled binary fetched from GitHub releases, same `/releases/latest` redirect-resolution pattern as gosu/fzf/git-lfs/etc.). It pairs with `git-crypt`, which has been installed via apt all along but wasn't asserted by smoke or called out in user-facing docs. Several of the user's repos use both as part of their secret-management setup (gitleaks pre-commit hook + git-crypt for selectively-encrypted canonical config); having them in the devbox means `pi install`-style hooks fire correctly inside the container instead of warning that gitleaks is missing.

Dockerfile.variant

@@ -36,7 +36,7 @@ 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=1.15.10
+ARG OPENCODE_VERSION=1.15.11
 RUN if [ "${INSTALL_OPENCODE}" = "true" ]; then \
       NPM_CONFIG_PREFIX=/usr npm install -g opencode-ai@${OPENCODE_VERSION} && \
       opencode --version ; \