dsh-plugin-maker v0.6.20

fix: adapt to DSH 0.1.3-alpha.2 — add the 0.1.2→0.1.3 migration facts (SessionHandle / Session.events / ctx.agent / report / format v2 / sqlite backend / persona prefix+suffix), pin upstream watch to dsh-v0.1.3-alpha.2, drop dead apiProxy & dsh-client-runtime hook paths, fix the version-baseline test.