v0.1.1

• Declared harness compatibility in peerDependencies: the harness services this
  plugin integrates with (@deepseek-ai/dsh-commands, @deepseek-ai/dsh-subagent)
  and @deepseek-ai/cordis are now listed, with each verified line spelled out
  explicitly (0.1.1-rc.2, 0.1.5-rc.2) because npm's prerelease rule makes the
  usual union pattern miss 0.1.5-rc.2. The harness peers are marked
  peerDependenciesMeta.optional so a package manager never installs the host
  harness itself — the profile injects those services at load time. Added
  engines.node. No runtime change.
• Documented a compatibility matrix in both READMEs: verified end-to-end on
  DSH Desktop 2.0.13 (harness 0.1.5-rc.2, cordis 4.0.2, schemastery 3.18.2)
  and previously on DSH Desktop 2.0.3 (harness 0.1.1-rc.2).