feat: initial marketplace (knowledge-curator + venture)

knowledge-curator/commands/kg-apply.md

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+---
+description: Apply an approved kg-changeset.json to the memory hub. Backs up the graph first; confirms each destructive operation.
+allowed-tools:
+  - Read
+  - mcp__memory__read_graph
+  - mcp__memory__create_entities
+  - mcp__memory__create_relations
+  - mcp__memory__add_observations
+  - mcp__memory__delete_entities
+  - mcp__memory__delete_relations
+  - mcp__memory__delete_observations
+---
+
+You apply an approved change-set to the memory-hub knowledge graph. This is the
+ONLY place that writes to the graph.
+
+## Safety procedure — do not skip
+1. **Backup first.** Call `mcp__memory__read_graph` and write the full dump to
+   `./kg-backup-<ISO-timestamp>.json`. Confirm the file exists before any write.
+2. Read `./kg-changeset.json` (or the path in $ARGUMENTS).
+3. Print a human-readable diff grouped by operation type
+   (merges, new_relations, deletions, type_migrations, renames) with counts.
+4. **Ask for confirmation per destructive group.** Merges and deletions are
+   irreversible at the graph level — require an explicit "yes" for each group.
+   New relations and non-destructive adds can be batched after a single "yes".
+5. Apply in this safe order:
+   1. create new entities / relations (additive, low risk),
+   2. add observations,
+   3. perform merges (re-point relations to canonical, copy observations,
+      then delete the redundant members),
+   4. apply type migrations / renames,
+   5. perform standalone deletions last.
+6. After each group, re-read affected nodes to verify, and report what changed.
+
+If `kg-changeset.json` is missing or malformed, stop and tell the user to run
+`/kg-curate` first. Never invent changes that aren't in the change-set.
+
+$ARGUMENTS

knowledge-curator/commands/kg-curate.md

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+---
+description: Audit and restructure the MCP memory-hub knowledge graph (read-only). Produces a German report + kg-changeset.json.
+---
+
+Run the `knowledge-curator` skill: dispatch the four read-only KG subagents in
+parallel, synthesize their findings into a German audit report, and write the
+proposed change-set to `./kg-changeset.json`. Do not mutate the graph — stop
+after presenting the report for review.
+
+$ARGUMENTS