kyssta-exe 956af7f3c3 fix(agent): add metadata flag to context compression summary messages (#38389) ...

Summary messages (standalone insertion and merge-into-tail) now carry a
metadata flag so frontends (CLI, Desktop, gateway, TUI) can distinguish
them from real assistant/user messages without content-prefix heuristics.

Re-applied from PR #38434 onto current main (conflicted with the
_SUMMARY_END_MARKER hoist). Key renamed from the PR's
'is_compressed_summary' to '_compressed_summary': the wire sanitizers
strip underscore-prefixed message keys, so the flag stays in-process and
can never reach strict gateways (Fireworks/Mistral/Kimi reject unknown
keys with 'Extra inputs are not permitted').

2026-06-12 16:47:15 -07:00

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