v5.9.2

Bug-fix batch from a GitHub-issue triage sweep.

Fixed

• Claude Desktop T3 search returned zero results (#1068). The .mcpb
  bundle pinned bare conexus, so its venv had no fastembed (only in the
  [local] extra) and the embedder silently fell back from bge-768 to the
  384-dim MiniLM while collections are indexed at 768/1024-dim — every search
  hit a dimension mismatch. The bundle now pins conexus[local]; reinstall the
  5.9.2 .mcpb to restore search. A regression test locks the [local] pin.
• Cross-project plan-match false positives (#1069). A grown corpus:all
  plan with no caller scope was saved with empty scope_tags and became a
  cross-project attractor in nx_answer's plan-match gate. save_plan and
  nx plan repair scope-tags now fall back to the plan's project column when
  retrieval-step inference yields nothing.
• MinerU spaced-token LaTeX (#1049). Formula output like { m a x } /
  \mathbf { s } is now normalized at extraction time (re-index to backfill
  existing content). Conservative: token-rejoin is scoped to a known-operator
  allowlist; prose is never touched.

Added

• nx plan set-scope <id> <tags> [--from-project] (#1073). Operator-facing
  verb to set/correct a plan's scope_tags (explicit admin override).
• nx index md --collection (#981). Route Markdown into a knowledge__*
  collection (parity with nx index pdf) so it becomes aspect-eligible without
  a PDF round-trip. Emits a warning that the scholarly-paper aspect extractor is
  applied to knowledge__ targets (a general-prose extractor is tracked
  separately).