- paths/foundation: m0 orientation is now an optional extra-credit module
  (never first step, never badge-required); verify_paths understands
  "optional" and badge math excludes it. Route-challenge copy: the module
  pages live on flypython.com now, repo keeps the canonical markdown.
- six tool-course L01s (en+zh): step 2 pre-installs the Skill as optional
  (the entry sentence reads it from the URL); starter failure count
  corrected to "five classes + two end-to-end consequences = seven named
  failures".
- READMEs: new positioning line, same change both languages.

make check green (12 courses, 2 paths).

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FP-1012: docs/repo-plan-0.1.0.md -> docs/repo-plan-0.1.x.md (community
courses are a post-launch 0.1.x track, not the launch version); CHANGELOG
gains the 0.0.9 and 0.1.0 sections recording FP-983/FP-984 and the rename.

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FP-1012: pyproject 0.1.1 (the v0.1.0 tag stays immutable on e420fca);
CONTRIBUTING gains the release/tag rules — tags immutable, independent
repo/website versions linked by CHANGELOG + Release mapping, website
consumes only a pinned full SHA. CHANGELOG records the v0.1.0-website /
v0.1.1-repo compatibility.

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