.gitattributes

# Append-only / accumulator files written by parallel ingest subagents during /init.
#
# These files have a single shared structure that every paper appends to:
#   - wiki/log.md            : every ingest appends a "## [date] ingest | ..." line
#   - wiki/graph/edges.jsonl : every add-edge appends a JSON line
#   - wiki/graph/citations.jsonl : every add-citation appends a JSON line
#   - wiki/index.md          : every paper/concept/method adds a YAML entry
#
# When 10 parallel subagents (one per paper) write to these files in their own
# git worktrees and we then merge the worktree branches sequentially, git's
# default line-based merge sees concurrent appends to the same region and
# reports add/add or content conflicts on EVERY merge — even though the
# resolution is always "keep both sides".
#
# `merge=union` is git's built-in driver for exactly this case: on conflict,
# both sides are concatenated (no manual resolution, no merge marker). The
# orchestrator then runs a Phase C cleanup that deduplicates graph JSONL files
# and rebuilds index.md from entity frontmatter via `research_wiki.py
# rebuild-index`, so any duplicate lines introduced by `merge=union` are removed
# by the time Step 7 finishes.
#
# Without this driver, /init's Phase B fan-in fails on the first merge and
# cascades into manual cherry-pick recovery (see init/SKILL.md error handling
# entries for the failure modes this prevents).
wiki/log.md                merge=union
wiki/graph/edges.jsonl     merge=union
wiki/graph/citations.jsonl merge=union
wiki/index.md              merge=union