Fix import path for formatting in reporting.md

[eaftan]

Fixes #179

[dsyme]

@eaftan I simplfied by removing the transitive import from a nested directory. But there's a bug here for sure

Situation was

workflows/workflow.md imports "shared/file1.md"

workflows/shared/file1.md imports "shared/file2.md"

workflows/shared/file2.md imports nothing

Install via remote gh aw add githubnext/agentics/workflow fails

install by local gh aw compile workflows/file1.md succeeds

Didn't try install via local gh aw add workflows/workflow.md

[dsyme]

Bug filed here github/gh-aw#17620