A skill load via the `skill` tool returns the loaded skill's instructions
as a tool result. Keep it a tool result (that is what it is), but make it
findable: tag the node with the skill name (so the Context browser labels the
row `Skill · <name>`) and record an inject event so a `Skill 注入（name）`
entry shows in the Context Events card.
- fold: detect tool/result with node.tool === 'skill', parse the skill name
from the rendered <skill_content name="…"> wrapper, set node.skill, emit a
sub:'skill' inject event. Category stays 'tool'.
- browser: tool row shows the Skill · <name> tag when node.skill is set.
- i18n: add node.skillTag (zh/en).
- test: regression for the skill-tool result path.
tangjunyan.5703
a2641b7d29