kapil971390 d050fba07f
fix(token-budget): acquire _lock in _apply, before_agent, and _drain_pending_warnings (#3714)
_lock was defined in __init__ and used only in reset(), leaving _apply(),
before_agent(), _clear_run_state(), and _drain_pending_warnings() unprotected.
Concurrent after_model callbacks for the same run_id could race on
usage_accum.input += diff_input, causing lost-update on token counters.

Also fix stray bare 'a' character in frontend/src/content/zh/introduction/index.mdx
that rendered as visible text on the documentation page.

Co-authored-by: kapilvus <kapilvus@gmail.com>
2026-06-22 20:44:07 +08:00
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