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Trevin Chow 92a6bb63f0 fix(ce-commit-push-pr): classify a named stack parent from CLI facts
Five review rounds produced 16 findings on the named-parent block, and
each fix opened a new inconsistency, because the prose was encoding a
procedure to route around gh stack behavior it had wrong. The missing
piece was tool facts, not procedure steps.

Adds references/gh-stack-cli.md: the semantics this skill depends on,
verified against gh stack v0.1.0, self-contained so no separate gh-stack
skill has to be installed, and deferring to --help on any conflict.

Topology collapses onto those facts and drops the case matrix:

- Classification is gh stack checkout by PR number plus its exit code.
  A PR number pulls the stack down from GitHub; a bare branch name is
  local-only. Exit 2 is standalone, 6 and 9 are residuals
- gh stack init adopts branches that exist and creates those that do
  not, so no layer branch has to be made in advance and the separate
  default-branch construction path is unnecessary
- gh stack add enforces top-of-stack itself with exit 5, so mid-stack
  attachment needs no prose rule
2026-08-13 09:13:51 -07:00
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