Session Handoff [auto-2244]: Refuse a Drive-Letter Component Anywhere in a Tree Path per #2244 #2245

Next steps, in priority order

1. Fix Refuse a Drive-Letter Component Anywhere in a Tree Path, Not Only at Its Start #2244: refuse a drive-letter spelling in any path component, not only at the start of the value, in spec/validate.py's escapes_repo_root and in scripts/carry.py's relative_root alike, so both tools refuse such a value before either one's component walk (current /= part) joins it. Add a test in each tool's suite that a value such as real/C:x is refused, and prove each test by reverting the fix and watching it fail. Done looks like a feature -> develop pull request merged with Closes on promotion: #2244 in its body.

External blockers

None known. The defect needs a Windows host to reach, but the fix is a string-level refusal, so it is testable on Linux without one.

Internal dependencies

None. #2243 (#1452), which added symlinked_component and the tree check's call to escapes_repo_root, is already merged to develop, so the fix builds on develop as it stands.

State

• Lane created by an unattended-handoff picker, scope develop. No branch, worktree, or pull request exists for it yet.
• Re-derive: git worktree list, open pull requests naming Refuse a Drive-Letter Component Anywhere in a Tree Path, Not Only at Its Start #2244, and whether Have the Tree Check Call escapes_repo_root and Refuse a Symlinked Component #2243's code on develop still reads as Refuse a Drive-Letter Component Anywhere in a Tree Path, Not Only at Its Start #2244 describes.

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