Comments are injected into the next worker's system prompt by
build_worker_context() as '**{author}** (timestamp): {body}'. The
previous code accepted args['author'] as a free-form override and
exposed it on KANBAN_COMMENT_SCHEMA, which let a worker:
1. Receive a prompt-injection in a malicious task body.
2. Call kanban_comment with author='hermes-system' (or any other
authoritative-looking name) on a sibling task.
3. The next worker assigned to that sibling task sees the forged
comment in its boot context as what reads like a system-authored
directive.
Always derive author from HERMES_PROFILE (the dispatcher already sets
this per worker at hermes_cli/kanban_db.py:3718), and remove the
'author' property from the tool schema so the LLM can't see the
override surface.
Cross-task commenting itself remains unrestricted (see #19713) —
comments are the deliberate handoff channel between tasks; only the
author-override surface is closed.
Co-authored-by: kshitijk4poor <82637225+kshitijk4poor@users.noreply.github.com>
memosr
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