Add memory-dream skill + additive cross-machine memory sync

memory-dream: read-only memory lint/consolidation analyzer (index, backlinks,
stale refs, dup clusters, profile drift); additive-only --apply-safe, all
merges/deletes are proposals. sync-memory.sh: additive repo<->harness-profile
union (no delete/overwrite, conflicts surfaced), wired to a SessionStart hook.
Migrates the useful profile-only memories into the synced repo store.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.claude/memory/feedback_syncro_html.md

@@ -0,0 +1,17 @@
+---
+name: Syncro comment HTML formatting
+description: Use <br> for line breaks in Syncro comments, not <ul>/<li> — list tags don't render
+type: feedback
+originSessionId: b39e319c-ac3e-49f5-afb6-755e08f1fd82
+---
+Use `<br>` for line breaks in Syncro comment bodies. Do NOT use `<ul>`, `<li>`, or other block-level list tags — Syncro's renderer collapses them into a single line with no spacing.
+
+**Why:** Posted a comment with `<ul><li>` items and they all ran together on one line in the ticket view. Had to post a corrected duplicate.
+
+**How to apply:** For any bulleted list in a Syncro comment, use:
+```
+- Item one<br>
+- Item two<br>
+- Item three
+```
+wrapped in a `<p>` tag. Never use `<ul>/<li>`.