docs(changelog): stamp #7428 skill-not-found truncation disclosure

CHANGELOG.md

@@ -5,6 +5,8 @@
 
 ### Fixed
 
+- **When a skill isn't found, the error reply no longer implies the skill list is complete when it was truncated.** `/api/skills/content` capped the `available_skills` courtesy list at 20 names but presented it as the whole set, so a caller (agent or human) that couldn't find its skill there would wrongly conclude it isn't installed. The reply now includes `total_skills` and `available_skills_truncated`, and the hint reads "Showing 20 of N skills…" when the list is cut, so a missing skill is never mistaken for an absent one. Thanks @elight. (#7428, closes #7426)
+
 - **Session title generation and the handoff summary work again on the Anthropic and Codex out-of-band paths.** A Hermes Agent refactor unified provider dispatch and removed the two response normalizers these paths called (`agent._normalize_codex_response` and `agent.anthropic_adapter.normalize_anthropic_response`), so on a current Agent both paths raised as soon as they ran — background title generation and the handoff summary silently produced nothing on those providers. Both call sites now go through the Agent's current transport API (`_get_transport(...).normalize_response(...)`), matching the Agent's own canonical helper including the Anthropic OAuth tool-prefix strip. Empty-response and incomplete-summary handling are unchanged. Thanks @zicochaos. (#7402)
 
 - **A long final assistant message no longer stalls every other active stream for seconds.** The echo-suffix folding that removes a duplicated tail from streamed text re-normalized the entire remaining window for *every* candidate cut position — quadratic in the window size, so a ~6,000-character conclusion burned seconds of CPU while holding the GIL, freezing every other stream in the process. The window is now folded once and the cut point located by walking backwards across the echo, which is linear and produces byte-identical output on every input (verified by ~380,000 differential comparisons across Unicode whitespace, window sizes, straddling and repeated echoes, with zero divergences). Thanks @ruizanthony. (#7288)