AGENTS: add 'Upstream sources' section pointing at anomalyco/opencode

Tonight's v1.15.10 release surfaced a documentation drift footgun: I
checked github.com/sst/opencode (a fork) for release notes instead of
the canonical github.com/anomalyco/opencode. Empty bodies on sst led
me to write 'upstream releases ship empty bodies and no CHANGELOG'
in the v1.15.10 CHANGELOG, which was wrong — anomalyco's release
pages have rich Core/TUI/Desktop/SDK sections.

Added a new 'Upstream sources — where to look up release notes'
section between 'Versioning scheme' and 'Critical conventions',
documenting:
  - Canonical upstream for opencode-ai (anomalyco/opencode), pi
    (npm tarball CHANGELOG.md), other floated tools.
  - The sst/opencode trap explicitly named so future-pi doesn't
    repeat the mistake.
  - Working fetch commands as muscle memory: 'npm view ... time'
    for latest stable filtering, 'curl /releases/tags/' for body,
    'npm pack' for pi's changelog.

No CI implications, doc-only.

AGENTS.md

@@ -32,6 +32,31 @@ CI produces eight Docker Hub tags per release: `vX.Y.Z[n]`, `latest`, `vX.Y.Z[n]
 
 When bumping the opencode version, bump `OPENCODE_VERSION` in `Dockerfile.variant` and update the comment in `.env.example` if it names a specific model/version for context.
 
+## Upstream sources — where to look up release notes
+
+When drafting a release CHANGELOG entry, pull notes from the **canonical upstream repo for each tracked package**. Getting this wrong leads to thin or wrong release notes; the image bytes are unaffected but the documentation suffers.
+
+| Package | Canonical upstream | What you'll find there |
+|---|---|---|
+| `opencode-ai` (npm) | <https://github.com/anomalyco/opencode/releases> | Per-version release notes with Core / TUI / Desktop / SDK sections, contributor attributions. Some versions have empty bodies (internal/no-user-visible); most do not. |
+| `@earendil-works/pi-coding-agent` (npm) | The `CHANGELOG.md` shipped inside the npm tarball: `npm pack @earendil-works/pi-coding-agent@<version>` then extract `package/CHANGELOG.md`. | Rich changelog with New Features / Added / Changed / Fixed sections per version. |
+| Other floated tools (gosu, fzf, bat, eza, zoxide, uv, nvim, gitea-mcp, Go, oh-my-opencode-slim) | Each project's own GitHub releases page | Usually less material per release; quote selectively. |
+
+**Trap to avoid:** there is a `github.com/sst/opencode` repo that some search results surface; that's a fork (and probably the historical name people associate with opencode given the upstream lineage). It does NOT track the same release timeline. Use `anomalyco/opencode` for opencode release notes.
+
+Fetch pattern (saved here for muscle memory):
+
+```bash
+# Latest stable opencode-ai versions on npm
+npm view opencode-ai time --json | python3 -c 'import sys,json,re; d=json.load(sys.stdin); print(*sorted([(v,t) for v,t in d.items() if re.fullmatch(r"\d+\.\d+\.\d+",v)], key=lambda x:x[1], reverse=True)[:6], sep="\n")'
+
+# Release notes for a specific version
+curl -s https://api.github.com/repos/anomalyco/opencode/releases/tags/v1.15.10 | python3 -c 'import sys,json; print(json.load(sys.stdin).get("body","(empty)"))'
+
+# pi changelog
+cd /tmp && npm pack @earendil-works/pi-coding-agent@0.75.5 && tar -xzf earendil-works-pi-coding-agent-0.75.5.tgz package/CHANGELOG.md && head -40 package/CHANGELOG.md
+```
+
 ## Critical conventions
 
 - **entrypoint.sh volume ownership loop** — when adding a new named volume mount point, add it to the `for dir in ...` loop in `entrypoint.sh` so root-owned volumes get chowned on startup. The loop writes a `.devbox-owner` sentinel after a successful chown so subsequent starts skip the recursive walk. Users should not touch these files.

CHANGELOG.md

@@ -8,6 +8,35 @@ Tags follow `v{opencode_version}[letter]` — bare tag for the first build on a
 
 ## Unreleased
 
+## v1.15.10 — 2026-05-23
+
+opencode 1.15.6 → 1.15.10 bump (four upstream patch releases over two days). Plus implicit pi 0.75.4 → 0.75.5 in the `with-pi` and `omos-with-pi` variants since `PI_VERSION=latest` resolves at build time.
+
+No image-content changes beyond the version bumps; cache hit expected on `base-35ee5fe7861a` (no `Dockerfile.base` or `rootfs/` edits since v1.14.50b).
+
+### Notable upstream opencode changes
+
+Sourced from <https://github.com/anomalyco/opencode/releases> (the upstream this devbox tracks).
+
+**v1.15.7** — Grok OAuth (SuperGrok) sign-in including device-code login (@Jaaneek). V2 session APIs gain safe error responses with reference IDs (UnknownError, SessionNotFoundError, ServiceUnavailableError) so generic 500s no longer leak config details. Codex OAuth refreshes deduped to avoid repeated refresh failures (@cooper-oai). Native OpenAI OAuth requests restored. Tool schema failures now surface as friendly tool errors. PDF attachment support for Grok. Restored OpenAI reasoning streams. TUI: clearer collapsed-thinking punctuation, new sessions default to local project, single-select question checkmarks no longer collide with labels. Desktop: pinch zoom, new home view + session entry flow + titlebar, log export.
+
+**v1.15.8** — Upstream release body empty; assumed internal/no user-visible changes.
+
+**v1.15.9** — Redesigned diff viewer with file tree, **enabled by default**. MCP OAuth configs can set callback port and include configured scopes in client metadata (@sebin). Vertex Anthropic provider uses working `.rep.googleapis.com` endpoints for US/EU multi-region (@JPFrancoia). Many "show clearer error" improvements (default model invalid, missing PTY session, skill invocation failure, installation upgrade failure, project not found via HTTP API, MCP server not found, session busy). Native reasoning continuation metadata preserved across turns. TUI: copy worktree path from command palette, refined diff viewer shortcuts, spinner color aligned with active agent (@OpeOginni). Desktop: tab navigation in titlebar, session status in titlebar, multi-colon callback URL fix (@OpeOginni), debounced VCS refreshes.
+
+**v1.15.10** — Single fix: restored the legacy production desktop flows for opening projects and starting sessions.
+
+### Devbox-side notes
+
+- **Bump:** opencode 1.15.6 → 1.15.10 (`OPENCODE_VERSION` in `Dockerfile.variant`).
+- **Implicit pi bump:** `with-pi` and `omos-with-pi` variants pick up pi 0.75.5 (one patch release with cleaner read-tool cards, async file tools, more reliable package updates, Bedrock token cap fix, etc.). See [pi-devbox v0.75.5 CHANGELOG](https://gitea.jordbo.se/joakimp/pi-devbox/src/branch/main/CHANGELOG.md) for the full list.
+- **Smoke threshold check:** `omos-with-pi` threshold remains at 3700 MB (set v1.15.4b 2026-05-18). Four opencode patches plus one pi patch typically add only a few MB across both; not expected to trip. If it does, recovery is the well-worn letter-suffix pattern (v1.15.10b with threshold bump).
+- Built on the same CI path as v1.15.6 (pinned-crane install on real-base-rebuild, skip-promote-on-cache-hit, update-description-always-on-base-success) — all expected to remain quiet on this cache-hit run.
+
+### Note on this CHANGELOG vs the v1.15.10 tag snapshot
+
+The v1.15.10 tag itself was pushed before the upstream release notes were located (originally I checked `sst/opencode` which is a fork; the canonical upstream is `anomalyco/opencode`). The image content under the tag is correct, but the CHANGELOG snapshot at the tag was thinner. This expanded version is on `main` going forward; the tag's snapshot will not be retroactively rewritten.
+
 ## v1.15.6 — 2026-05-21
 
 opencode 1.15.4 → 1.15.6 bump (two upstream patch releases) plus two workflow improvements that landed on `main` between v1.15.4b and now. No image-content changes beyond the version bump; cache hit expected on `base-35ee5fe7861a` (no `Dockerfile.base` or `rootfs/` edits).

Dockerfile.variant

@@ -32,7 +32,7 @@ ARG USER_NAME=developer
 
 # ── Install opencode via npm ─────────────────────────────────────────
 ARG INSTALL_OPENCODE=true
-ARG OPENCODE_VERSION=1.15.6
+ARG OPENCODE_VERSION=1.15.10
 RUN if [ "${INSTALL_OPENCODE}" = "true" ]; then \
       NPM_CONFIG_PREFIX=/usr npm install -g opencode-ai@${OPENCODE_VERSION} && \
       opencode --version ; \