Bulk link creation command (pyrite link bulk-create) — pyrite

Problem

Cross-KB linking produces dozens of links at once. Currently requires looping `pyrite link` N times, each with its own index write. Slow and wasteful.

Proposed Solution

Add `pyrite link bulk-create` for batch link creation:

\`\`\` pyrite link bulk-create --file links.yaml --kb [--dry-run] \`\`\`

File format

\`\`\`yaml

source: ooda-loop

target: pdca-cycle target_kb: deming relation: parallel_concept note: "Both are iterative learning cycles" \`\`\`

Also accept stdin

So subagents can pipe output directly without temp files.

Impacted Files

`pyrite/cli/link_commands.py` — add `bulk-create` subcommand

`pyrite/services/link_service.py` or equivalent — batch write logic

Pattern: similar to existing `kb_bulk_create` MCP tool

Acceptance Criteria

Accepts YAML file or stdin with link definitions

Single index sync after all links created

`--dry-run` shows what would be created

Reports created/skipped/failed counts

Bulk link creation command (pyrite link bulk-create)backlog_item