Deduplicates the mkstemp→fsync→atomic_replace pattern that existed in
three places: agent_import.py (added by #72983), MemoryStore._write_file,
and skill_manager_tool._atomic_write_text. All three now call a single
utils.atomic_write_text helper.
Also wraps the atomic_write_text call in _merge_memory_entries with
try/except OSError so a write failure records a per-item error instead
of propagating uncaught and aborting the entire import with no record.
Follow-up to #72983.
memories/MEMORY.md is the "§"-delimited store written by MemoryStore, not a
markdown document. parse_existing_memory_entries() fell back to
extract_markdown_entries() -- the *source* parser for CLAUDE.md / AGENTS.md --
whenever the destination held no delimiter, which is exactly the case for a
single-entry store or one that was hand-edited or shell-appended. That
extractor skips fenced code blocks, skips table rows, splits a block into one
entry per bullet and reflows paragraphs. The shredded result was then written
straight back over the user's store and reported as "Imported", with no backup
to recover from.
Parse the destination the way MemoryStore._parse_entries does: split on
ENTRY_DELIMITER only, so a store with no delimiter is one intact entry.
extract_markdown_entries() is unchanged and still used on the sources, where
it is correct.
Also restore the safety net the port dropped. The openclaw migration script
this module was ported from calls maybe_backup(destination) before rewriting a
memory store; the port did not. Snapshot the store to <name>.bak.<unix_ts>
(same naming as MemoryStore._backup_drifted_file), refuse to rewrite when the
snapshot fails, and write via temp file + atomic rename so an interrupted
import cannot leave a truncated store and a symlinked MEMORY.md stays a
symlink.
The identical fallback lives in openclaw_to_hermes.py, where it is reached
from migrate_memory() (memories/MEMORY.md and memories/USER.md) and
migrate_daily_memory(); fixed there too.
Maps CLAUDE.md/AGENTS.md, permission allowlists, MCP servers, skills, and memories into their Hermes equivalents. Follows the openclaw migration pattern. Inspired by ChatGPT Work import-from-another-agent onboarding.
