Adds pruneSupersededToolResults() and the opt-in PruneConfig.supersedeKey hook: when a tool call shares a key with a newer one (e.g. a re-read of the same file), the older result is pruned even inside the protectTokens window and replaced with a [Superseded by a newer read of this file] placeholder. Adds readToolSupersedeKey() and the shared splitReadSelector() implementing the read-tool path/selector grammar (including the .. range alias and L-prefix forms) so selector-free reads supersede range reads of the same file and URL-scheme paths are exempt. Strips selectors before tracking in <read-files> compaction lists, so reads dedupe to the base path and match write/edit paths when splitting read-only vs modified lists (selector-polluted lists from earlier compactions self-heal on the next pass). Gated by the new compaction.supersedeReads setting (default on).
can1357