Files
hermes-agent/tests/agent
kshitij 241605d1ea fix(compression): durable-sync the prune runway on model switch + fast no-op for incapable stores
Three review follow-ups on the salvaged #79286 commit:

- update_model() zeroed the in-memory prune runway but left the durable
  model_config copy stale, breaking the method's own durable-sync
  discipline (the strike reset three lines above keeps its durable copy
  in sync). A restart after a model switch resurrected a runway
  computed under the old model's trigger sizes. New
  _clear_durable_proactive_prune_rearm() removes the persisted key via
  patch_session_model_config() without touching the transcript.

- The archive_and_compact capability check ran AFTER the expensive
  3-pass prune scan, so a duck-typed session store lacking the method
  paid the full scan on every eligible iteration forever with pruning
  permanently no-opping. Hoist it above the scan (all in-tree stores
  pass a real SessionDB; this only affects third-party stores).

- _load_proactive_prune_rearm_tokens now uses the shared
  get_session_model_config_value() accessor instead of inlining a 5th
  copy of the model_config JSON parse, matching its sibling loaders'
  typed-accessor pattern.

Also documents why the rotation-publish-failure branch restores only
the runway field rather than the full attempt snapshot.

Tests: model-switch durable clear, patch_session_model_config
merge/delete/no-op, and a guard proving incapable stores skip the scan.
2026-08-06 02:22:08 +05:30
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