Add plugin octopus-meme-maker

[weekbin]

What changes

Adds plugins/weekbin/octopus-meme-maker — a Skill-only Plugin that turns a scene description into a Smooth Squishmallow-style pink-octopus office-worker GIF meme (720x720 looping + 480x480 mini).

Ships the portable Agent Plugins 1.0 manifest that the hosted validator checks, plus the mcode 0.4.0+ Claude Code compatible manifest (.claude-plugin/plugin.json) that docs/plugin-compatibility.md now recommends shipping in parallel for a cross-runtime Plugin. .minimax-plugin/plugin.json is the Marketplace submission manifest; README documents which reader takes each.

Stage 1 is a mandatory 6-candidate contact-sheet loop: one image_synthesize call with 6 parallel requests, a numbered contact sheet (1460x974), hand it to the user, then stop. Stage 2 must not start until the user picks. Four Python scripts assemble the GIFs; _fonts.py and _platform.py hold the shared CJK-font and cross-platform helpers.

User value

A MiniMax Code user can produce a new meme in the existing 烤焦了-style library without touching ffmpeg. The character stays consistent because the prompt is anchored to bundled base-pose references plus a ban-list, and the user picks from 6 candidates instead of accepting a single render.

Example prompt:

给我做一个新的章鱼打工人表情包：摆烂躺平（趴在桌上，一只眼睛半闭，另一只全闭，一条触手尖端着一杯咖啡）。
角色必须和 examples/*.png 里的参考底图一致。
结果存到 <scene-dir>/，按 skills/octopus-meme-maker/SKILL.md 里的流程执行（6 候选拼图 → 用户挑选 → base.png）。

Expected result: <scene-dir>/base.png (1024×1024) → <scene-dir>/video.mp4 (1080×1080, 141 frames @ 24fps) → <scene-dir>/final.gif (720×720, 141 frames) + <scene-dir>/final-mini.gif (480×480, 141 frames).

Plugin submission checklist

• Plugin lives at plugins/<github-owner>/<plugin-name>.
• plugin.json name matches the Plugin directory.
• README.md includes a real example prompt and expected result.
• LICENSE and plugin.json declare an open-source license.
• Required executables, accounts, paid services, and supported platforms are disclosed.
• Network destinations and data handled by the plugin are disclosed.
• No credentials, private endpoints, hidden telemetry, installers, symlinks, or native binaries are included.
• Every scaffold TODO has been replaced.
• npm run check passes.

Evidence

$ node scripts/validate.mjs
OK   plugin weekbin/octopus-meme-maker
Validated 26 hosted Plugins and all examples.

$ node --test tests/plugins/octopus-meme-maker/smoke.test.mjs
# tests 65
# pass 65
# fail 0

Host-tool calls in the docs were checked against the shipped @minimax-ai/code schemas (mcode 0.4.6) rather than assumed. gen_videos takes prompt, output_file_path (required), input_image_path, reference_type, duration (6|10) and resolution (768P|1080P) — there is no fps and no size parameter, and generation is asynchronous. image_synthesize accepts up to 10 requests with at most 4 reference images. Paths outside the session workspace are rejected, temp directories included.

Manual test — the README self-test runs end to end against the bundled sample video on both platforms, with identical artifact geometry:

Artifact	macOS 13+ (Py 3.14.7 / Pillow 12.3.0 / ffmpeg 8.1.2)	Ubuntu 24.04.4 (Py 3.12.3 / Pillow 10.2.0 / ffmpeg 6.1.1)
overlay	1080×220 RGBA	1080×220 RGBA
preview	2400×530 RGB	2400×530 RGB
contact sheet	1460×974 RGB	1460×974 RGB
final.gif	720,720,141	720,720,141
final-mini.gif	480,480,141	480,480,141
14-char caption auto-fit	size 88	size 88

Cross-platform notes: no shell invocation (subprocess.run with argv lists only), no locale-dependent subprocess decoding, os.path.join throughout, Windows reserved output names rejected (CON/NUL/AUX/…), and a console-encoding fallback so a CJK caption cannot raise UnicodeEncodeError on a cp1252 or cp936 console. Windows itself is untested — no host available — and the README says so rather than claiming it.

Local npm run check caveat: validate and this Plugin's 65 tests pass locally. The full node --test run does not complete on my machine because two tests in the pre-existing plugins/Hylouis233/cli-agent-bridge time out — unrelated to this PR, and reproducible on plain upstream/main without my changes.

Plugin-local smoke.test.mjs is included at tests/plugins/octopus-meme-maker/ and skips its interpreter-dependent cases when python3 or Pillow is unavailable, so it stays green on the CI runner.

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[hetaoBackend]

发现一个边界条件问题：make_preview_strip.py 在 --workdir 指向一个已存在的普通文件时，会在 os.makedirs(..., exist_ok=True) 处抛出未捕获的 FileExistsError，向用户暴露 Python traceback。\n\n建议在创建目录前显式检查 os.path.isdir(workdir)，输出清晰的参数错误，并补充一个 --workdir 指向普通文件的回归测试。

[hetaoBackend]

两个核心参考资产的扩展名与真实格式不一致：examples/10-toilet-slacking-base.png 和 examples/11-touch-fish-base.png 实际是 JPEG，但 Skill 文档要求将它们作为 image_synthesize 的 input_file_paths 传入。宿主如果按扩展名推断 MIME 或校验扩展名，可能拒绝这些输入。\n\n建议将文件真正转码为 PNG，或统一重命名为 .jpg 并同步更新 SKILL.md、reference.md、README、examples/README.md 及 smoke test；同时让测试校验实际文件格式与扩展名一致。