fix(#4113): add no-op to empty then-body in chunked-planning-mode.md's outline resume-check (#4125)

* fix(#4113): add no-op to empty then-body in chunked-planning-mode.md's outline resume-check

The `### 8.5.1 Outline Phase` resume-detection `if` block only contained a
comment in its `then` clause, which is a syntax error under both bash and
zsh if executed literally. The workflow ShellCheck lint added by #4109
already flags this (SC1009/1048/1072/1073/2105) but the findings were
masked by matching entries in the pre-existing-findings baseline; those
five entries are removed here so a regression re-surfaces as a new
failure instead of being silently re-absorbed.

* chore: backfill changeset PR number for #4125

* fix(#4113): fix second empty-then/continue-outside-loop defect surfaced by baseline cleanup

Removing the 5 stale baseline entries for chunked-planning-mode.md in the
prior commit unmasked a second, genuinely separate ShellCheck finding
(SC2105) in a different fenced block of the same file: a bare `continue`
outside any bash loop in the ### 8.5.2 per-plan resume-check. Same root
cause class as the original bug (pseudocode fenced as literal bash) —
fixed the same way, with a `:` no-op preserving the documentation.

---------

Co-authored-by: sim <sim@local>

.changeset/steady-outline-marker.md

@@ -0,0 +1,5 @@
+---
+type: Fixed
+pr: 4125
+---
+**`/gsd-plan-phase --chunked`'s outline resume-check no longer has a syntax error** — the `### 8.5.1 Outline Phase` step's resume-detection block had an empty `then` clause (only a comment, no command), which is invalid under both bash and zsh if executed literally. (#4113)