feat(B): PreCompact hook prunes superseded context (Claude bonus) - #112
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…onus) The PreCompact hook now reads the event's transcript_path and appends a 'Superseded context (safe to drop)' section built from find_superseded — the one place TS can actually shrink context, since compaction is where the window is rewritten. Logic lives in tested Python (precompact_report); the hook change is a stdin capture + one call. Best-effort, gated by the same TS_MEMORY_DISABLE as the rest of the hook. Everywhere else, ts_stale_context stays the advisory cross-agent path. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Completes feature B.
ts_stale_context(merged in #111) surfaces superseded tool results as advice on any MCP agent; this adds the one place TS can actually remove them — the Claude Code PreCompact hook, which runs exactly when the conversation window is rewritten.precompact_report(transcript_path)(indiscover/superseded.py): reads the session transcript, runsfind_superseded, returns a compact 'Superseded context (safe to drop from the summary)' markdown section — or '' when there's nothing to prune. Best-effort, never raises.hooks/memory-precompact.sh: captures the PreCompact event payload from stdin, extractstranscript_path, appends the section. A stdin capture + one Python call; gated by the sameTS_MEMORY_DISABLEas the rest of the hook.Verified end-to-end: a transcript with a re-read of a file yields the section flagging that file. Tested:
precompact_reportfrom a real transcript file + the empty-on-missing case. ruff clean, bash -n clean.Honest scope: this is the Claude-only lever (compaction isn't exposed by other harnesses). Cross-agent prevention stays the pointer-returning tools (#110) + the advisory
ts_stale_context(#111).