Delete constraints the model learns from the call result, shorten
implementation detail, and move per-parameter rules into the owning
parameter descriptions. Bash, pwsh, and fs share one
sandbox_permissions description in dsh-sandbox.
The standard preset's first-turn prompt drops from 7985 to 6551 tokens.
Compaction threshold snapshots lower their context windows by the
1548-token tool-schema estimate reduction so each trigger keeps its
position; their fixtures move to v4 generations.