v0.1.28

Added

• A stage prompt carries the issue's comment thread and a manifest of parent, child, blocking and
  related issues. (#125)

Changed

• A stage pinned to runtime: codex fails with an error naming the migration to runtime: pi. (#127)
• A node advertises the runtimes it can both execute and credential, with dahrk doctor giving the
  reason for each verdict. (#127)

Fixed

• A batch stage doing one long tool call that streams no output is no longer killed as stalled. (#128)
• Every runtime: pi stage constructs a session on Pi's ModelRuntime API and runs again. (#124)
• An installed dahrk-node can run Pi stages, with the Pi SDK and MCP SDK now declared
  dependencies. (#127)