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)

gsd-core/workflows/plan-phase/steps/chunked-planning-mode.md

@@ -17,7 +17,7 @@ the `## OUTLINE COMPLETE` marker (written by the outline agent — #2762), skip
 ```bash
 OUTLINE_FILE="${PHASE_DIR}/${PADDED_PHASE}-PLAN-OUTLINE.md"
 if [[ -f "$OUTLINE_FILE" ]] && grep -q "^## OUTLINE COMPLETE" "$OUTLINE_FILE"; then
-  # reuse existing outline — skip to 8.5.2
+  : # reuse existing outline — skip to 8.5.2
 fi
 ```
 
@@ -67,7 +67,7 @@ For each plan entry extracted from `PLAN-OUTLINE.md`:
    ```bash
    PLAN_FILE="${PHASE_DIR}/${plan_id}-PLAN.md"
    if [[ -f "$PLAN_FILE" ]] && head -1 "$PLAN_FILE" | grep -q '^---' && [[ "$ARGUMENTS" != *"--reviews"* ]]; then
-     continue  # resume safety — NOT under --reviews (replan)
+     : # resume safety — skip this plan, continue to next plan entry — NOT under --reviews (replan)
    fi
    ```
 

scripts/lint-workflow-shellcheck-baseline.json

@@ -629,31 +629,6 @@
     "code": "2235",
     "message": "Use { ..; } instead of (..) to avoid subshell overhead."
   },
-  {
-    "file": "gsd-core/workflows/plan-phase/steps/chunked-planning-mode.md",
-    "code": "1009",
-    "message": "The mentioned syntax error was in this if expression."
-  },
-  {
-    "file": "gsd-core/workflows/plan-phase/steps/chunked-planning-mode.md",
-    "code": "1048",
-    "message": "Can't have empty then clauses (use 'true' as a no-op)."
-  },
-  {
-    "file": "gsd-core/workflows/plan-phase/steps/chunked-planning-mode.md",
-    "code": "1072",
-    "message": "Unexpected keyword/token. Fix any mentioned problems and try again."
-  },
-  {
-    "file": "gsd-core/workflows/plan-phase/steps/chunked-planning-mode.md",
-    "code": "1073",
-    "message": "Couldn't parse this then clause. Fix to allow more checks."
-  },
-  {
-    "file": "gsd-core/workflows/plan-phase/steps/chunked-planning-mode.md",
-    "code": "2105",
-    "message": "continue is only valid in loops."
-  },
   {
     "file": "gsd-core/workflows/plan-phase/steps/stall-detection-helpers.md",
     "code": "2086",