fix(plugins): address PR review — scope captureFolder to checkpoints, ASCII echo

Review feedback on #876:
- Codex (P2): the SessionStart "Where to write" brief said all auto-capture goes to
  captureFolder, but captureFolder is only the PreCompact checkpoint folder. Narrowed
  it — checkpoints go to captureFolder; decisions/tasks/notes follow
  placementConventions (or topic folders when none are set), so proactive captures
  aren't dumped into sessions/ alongside checkpoints.
- Claude review: replaced the em dash in the skills-source-guard echo string with a
  hyphen so the instruction's console output stays ASCII (CLAUDE.md compatibility).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: phernandez <paul@basicmachines.co>

plugins/claude-code/hooks/session-start.sh

@@ -255,13 +255,27 @@ if shared_capped:
 # Trigger: a primaryProject is set (so capture is actually active — pre-compact and
 # proactive writes land somewhere intentional). Why: the output style tells Claude to
 # follow the project's placement conventions, but nothing else surfaces them.
-# Outcome: Claude sees the capture folder + any stored conventions, so writes land
-# where the user expects instead of being guesswork. Bounded — conventions are a
-# short string by design.
+# Outcome: Claude sees that session checkpoints go to captureFolder while decisions/
+# tasks/notes follow the stored conventions — so it doesn't dump everything into the
+# checkpoint folder. Bounded — conventions are a short string by design.
 if primary_project:
-    placement = ["", "## Where to write", f"- Auto-capture and checkpoints go to `{capture_folder}/`."]
+    # captureFolder is the PreCompact *checkpoint* folder only; proactive captures
+    # (decisions, tasks, notes) follow placementConventions, not this folder.
+    placement = [
+        "",
+        "## Where to write",
+        f"- Session checkpoints (the PreCompact auto-capture) go to `{capture_folder}/`.",
+    ]
     if placement_conventions:
-        placement.append(f"- Placement conventions: {placement_conventions}")
+        placement.append(
+            "- Decisions, tasks, and other notes follow these placement "
+            f"conventions: {placement_conventions}"
+        )
+    else:
+        placement.append(
+            "- Place decisions, tasks, and notes in folders that fit their topic, "
+            "not the checkpoint folder."
+        )
     lines += placement
 
 # --- First-run / config nudges ---

plugins/claude-code/skills/setup/SKILL.md

@@ -150,7 +150,7 @@ copy with published versions. In that case **skip the install** and tell the use
 the skills are already present as source; don't run the command. Quick check:
 
 ```
-git ls-files skills/ | grep -q memory- && echo "source repo — skip install"
+git ls-files skills/ | grep -q memory- && echo "source repo - skip install"
 ```
 
 Otherwise, run from the project root: