feat(P1-002): migrate offline JSONL import/export to dedicated CLI

- Replace the MCP import_messages tool with standalone CLI commands:
  	iny-convmem-mcp --data-dir <path> --import <file>
  	iny-convmem-mcp --data-dir <path> --export <file>
- Add src/cli/{import,export,cli.h} and a CTest process test (tiny-convmem-mcp.cli)
  covering round-trip, manifest generation, overwrite/reject policies, and
  include_deleted export.
- Fix Debug heap corruption in 	iny_store_import() by deep-copying imported
  messages instead of taking ownership of caller-allocated records, which were
  later freed by the caller.
- Remove the now-redundant src/mcp/tools/import_messages.c and keep the tool
  registry at 7 MCP tools.
- Update docs/development-plan.md (P1-002 complete) and
  docs/implementation-status.md with CLI test coverage.

1 files changed, 13 insertions, 3 deletions

diff --git a/src/storage/store.c b/src/storage/store.c
index 45621d1..5701578 100644
--- a/src/storage/store.c
+++ b/src/storage/store.c
@@ -1957,16 +1957,26 @@ tiny_store_import(tiny_store_t *store,
         }
       if (existing != NULL)
         {
+          tiny_message_t replacement;
+          tiny_message_init(&replacement);
+          if (tiny_message_copy(&replacement, &record->message) != 0)
+            {
+              status = TINY_STORE_NO_MEMORY;
+              break;
+            }
           tiny_message_free(&existing->message);
           existing->deleted = record->deleted;
           existing->sequence = (uint64_t)record->message.timestamp_ms;
-          existing->message = record->message;
+          existing->message = replacement;
           (*imported_count)++;
         }
       else
         {
-          if (!ensure_entries(store))
+          tiny_message_t copied;
+          tiny_message_init(&copied);
+          if (!ensure_entries(store) || tiny_message_copy(&copied, &record->message) != 0)
             {
+              tiny_message_free(&copied);
               status = TINY_STORE_NO_MEMORY;
               break;
             }
@@ -1974,7 +1984,7 @@ tiny_store_import(tiny_store_t *store,
               &store->entries[store->entry_count], 0, sizeof(store->entries[store->entry_count]));
           store->entries[store->entry_count].deleted = record->deleted;
           store->entries[store->entry_count].sequence = (uint64_t)record->message.timestamp_ms;
-          store->entries[store->entry_count].message = record->message;
+          store->entries[store->entry_count].message = copied;
           store->entry_count++;
           (*imported_count)++;
         }