ci_select: address Copilot review - anchor _META_RE, cover rule 12b

Anchor the .github file alternatives. FUNDING.yml, labeler.yml and
membrowse_pr_message.j2 sat inside a group whose only `$` belonged to the
workflows/ branch, so they matched as prefixes: .github/labeler.yml.bak and
.github/FUNDING.yml.old were classified as metadata and would have selected
nothing. No such file exists today - the workflows/ alternative was already
anchored and ISSUE_TEMPLATE/ is a directory prefix on purpose.

Rule 12b had no test of its own: TestNoTrackedFileIsUnclassified only proved
src/typec no longer reaches rule 17, not that the answer is right. TestTypecRule
pins it - non-full, every selected example under typec/, all four src/typec files
answering alike, no rig board, and the set derived from CFG_TUC_ENABLED rather
than hardcoded, so it follows a new typec example on its own. Verified all four
fail with rule 12b removed.

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