fix(runtime): update(properties=...) merges instead of replaces (#71) + kg-swarm skills/agents

[ohdearquant]

Summary

Two complementary changes:

1. fix(runtime): properties update is now deep-merge instead of replace. Fixes BUG: update() returns ok=true but properties writes silently do not persist (polisher cycle-1 → cycle-2 evidence) #71 — update(id, properties={status: "X"}) was silently dropping all other property keys (domain, repo, crate, type). The docstring on EntityPatch promised "patch" semantics but the implementation replaced. Now uses merge_properties() with MergeStrategy::PreferFrom.

2. feat(marketplace): kg-plugin skills + agents for the kg-swarm pattern. Two new skills (gap, expand) + five new agents (digester, polisher, gap-analyst, expander, librarian). Each agent picks up GTD tasks assigned to it, processes, then assigns follow-up tasks downstream — no central orchestrator.

Why bundled

The swarm pattern needs the merge fix to be safe — any agent doing update(properties={status: ...}) was clobbering sibling properties under the old semantics. Verified empirically during a dogfood session (unimpl-adr-sweep show, 2026-05-19).

Test plan

• cargo test -p khive-runtime --release --lib curation:: — 13 tests pass including new update_entity_properties_merges_preserving_existing_keys
• make build — release binary compiles in ~48s
• Manually reproduced the bug pre-fix; verified post-fix that update(id, properties={status: "X"}) preserves all other keys
• Smoke test (python3 tests/smoke_test.py) — pending

Refs

• Closes BUG: update() returns ok=true but properties writes silently do not persist (polisher cycle-1 → cycle-2 evidence) #71
• Companion design issues: Pack design: communication + schedule (events, reminders, time-triggers) #67 (comm + schedule pack), Self-correction mechanism for the kg swarm — preventing noise amplification in the gap→expand→polish loop #68 (self-correction), Agent-driven PR workflow on top of kg-versioning: autonomous mutators commit, branch, open PRs, merge #69 (agent PRs), khive frontend: dashboard for swarm telemetry, KG exploration, GTD board, event stream, PR review #70 (frontend)
• Triggered by the unimpl-adr-sweep show's first swarm cycle (2026-05-19)

🤖 Generated with Claude Code

[ohdearquant]

Closing in favor of the 3 split PRs (per Ocean's PR-split rule — code/marketplace/docs as separate PRs for cleaner iterative codex review):

• fix(runtime): update(properties=...) merges instead of replacing (#71) #74 fix/update-merge-semantics-code — runtime update(properties) deep-merge fix (the BUG: update() returns ok=true but properties writes silently do not persist (polisher cycle-1 → cycle-2 evidence) #71 fix proper)
• feat(marketplace): kg-swarm skills and agents #75 feat/kg-swarm-marketplace — kg-swarm skills + agents (marketplace/kg/)
• style(adr): deno fmt --check on ADR docs (whitespace + emphasis) #76 style/adr-deno-fmt — pre-existing deno fmt drift fix on ADRs 029, 035-041

All 3 are off origin/main, scoped to one logical concern each. Will iterate codex pr review on each independently and merge on approve.