v1.17.2: bump opencode 1.16.2->1.17.2, deprecate pi, pin+patch mempalace

opencode-ai 1.16.2 -> 1.17.2 (OPENCODE_VERSION).

Deprecate all pi support ahead of v2.0.0 removal (pi now ships from the
standalone joakimp/pi-devbox image, v1.0.0+, which no longer FROMs
base-pi-only):
- build-time stderr deprecation warning when INSTALL_PI=true
- README / DOCKER_HUB.md / AGENTS.md mark the with-pi/omos-with-pi/pi-only
  variants + base-pi-only tag deprecated, point to pi-devbox
- docs/CLEANUP-v2.0.0.md committed as the removal plan
- CHANGELOG pre-announces the v2.0.0 NPM_CONFIG_PREFIX relocation

Harden mempalace install (mirrors pi-devbox):
- pin via MEMPALACE_VERSION ARG (default 3.4.0); unpinned install is what
  swept in the broken schema
- idempotent, self-deactivating patch stripping the top-level anyOf from
  mempalace_diary_write input_schema (Anthropic tools API rejects it).
  Upstream: MemPalace/mempalace#1728, PR #1735

Fold prior Unreleased smoke-test pi-extensions readiness fix into v1.17.2.

Dockerfile.base

@@ -259,14 +259,50 @@ RUN ARCH=$(case "${TARGETARCH}" in amd64) echo "x86_64" ;; arm64) echo "aarch64"
 # Always installed in the base (variant-independent). Set
 # INSTALL_MEMPALACE=false at base-build time to shave ~300 MB.
 ARG INSTALL_MEMPALACE=true
+# Pin mempalace explicitly (mirrors pi-devbox). An unpinned
+# `uv tool install mempalace` is what silently swept in the broken
+# diary_write top-level-anyOf schema (3.3.x/3.4.0) that breaks the
+# Anthropic tools API; pinning makes every bump a deliberate, reviewable
+# diff. Bump this in lockstep with pi-devbox's MEMPALACE_VERSION.
+ARG MEMPALACE_VERSION=3.4.0
 ENV UV_TOOL_DIR=/opt/uv-tools
 ENV UV_TOOL_BIN_DIR=/usr/local/bin
 RUN if [ "${INSTALL_MEMPALACE}" = "true" ]; then \
       mkdir -p /opt/uv-tools && \
-      uv tool install --no-cache mempalace && \
+      uv tool install --no-cache "mempalace==${MEMPALACE_VERSION}" && \
       /opt/uv-tools/mempalace/bin/python -c "import mempalace; print('mempalace', mempalace.__version__ if hasattr(mempalace, '__version__') else 'installed')" ; \
     fi
 
+# ── workaround: strip top-level anyOf from mempalace_diary_write schema ──
+# Mempalace 3.3.x/3.4.0 advertise diary_write's input_schema with a
+# top-level `anyOf: [{required:[entry]}, {required:[content]}]` to express
+# "either entry or content must be supplied". Anthropic's tools API rejects
+# top-level anyOf/oneOf/allOf, so pi/Claude fail at session start with
+# `tools.<n>.custom.input_schema: input_schema does not support oneOf,
+# allOf, or anyOf at the top level`.
+#
+# Patch the advertised schema to require ["agent_name", "entry"] and remove
+# the anyOf block. The handler keeps accepting `content` server-side as a
+# kwarg alias so existing callers still work.
+#
+# Idempotent and self-deactivating: once upstream releases the fix the
+# regex no longer matches and this RUN is a silent no-op.
+# Upstream tracking:
+#   https://github.com/MemPalace/mempalace/issues/1728
+#   https://github.com/MemPalace/mempalace/pull/1735
+# TODO: remove this RUN once a mempalace release containing PR #1735 is on
+# PyPI and installed by the line above.
+RUN if [ "${INSTALL_MEMPALACE}" = "true" ]; then \
+      MP_FILE="$(find /opt/uv-tools/mempalace -path '*/mempalace/mcp_server.py' | head -n1)" && \
+      if [ -z "$MP_FILE" ]; then echo "mempalace mcp_server.py not found" >&2; exit 1; fi && \
+      perl -0777 -i -pe 's/(?:[ \t]*\#[^\n]*\n)*[ \t]*"required":\s*\[\s*"agent_name"\s*\]\s*,\s*\n[ \t]*"anyOf":\s*\[\s*\n[ \t]*\{\s*"required":\s*\[\s*"entry"\s*\]\s*\}\s*,\s*\n[ \t]*\{\s*"required":\s*\[\s*"content"\s*\]\s*\}\s*,?\s*\n[ \t]*\]\s*,\s*\n/            "required": ["agent_name", "entry"],\n/s' "$MP_FILE" && \
+      if grep -q '"required": \["agent_name", "entry"\]' "$MP_FILE"; then \
+        echo "mempalace diary_write anyOf workaround: applied (or already clean)"; \
+      else \
+        echo "WARN: mempalace diary_write anyOf workaround did not match expected schema — upstream may have changed shape" >&2; \
+      fi ; \
+    fi
+
 # ── mempalace-toolkit — bash wrappers for session/docs mining ────────
 ARG INSTALL_MEMPALACE_TOOLKIT=true
 ARG MEMPALACE_TOOLKIT_REF=main