[nikbucher]

Fixes #36.

Changes

• Base image opencode-docker → shell-docker: the V1 layer (~520 MB compressed) is no longer shipped. An npm uninstall on top would only have added whiteouts.
• Drop @opencode/cli/node_modules after install. Its only contents are the platform binaries (optionalDependencies without a libc field, so npm installs both the glibc and musl variant). The postinstall hard-links or copies the matching binary into bin/, so the binary survives the delete.
• Remove --omit=optional, which had no effect.
• Restore what opencode-docker provided and shell-docker lacks: CMD ["opencode"] and an agent-owned ~/.config/opencode. Env, user and tini entrypoint are identical.
• CI: smoke-test arm64 (under QEMU) in addition to amd64, and fail if nested platform packages come back or @opencode exceeds 300 MB.
• Docs: an in-sandbox opencode upgrade reinstalls the unused libc variant, adding ~200 MB to that sandbox only.

Verification (local, arm64)

• Image 2.66 GB vs 2.97 GB without the delete. Base comparison: opencode-docker 3.22 GB vs shell-docker 2.35 GB (uncompressed, arm64).
• opencode --version → v2.0.32, package writable by agent, npm ls -g clean.
• Self-update via npm install -g @opencode/cli@2.0.32 works.
• The size guard passes on the image and fails after a reinstall.
• amd64 not verified locally (no emulation on this host), so CI covers it.

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