v2.8.10 - the five board seat agents now pass Antigravity's agent validator

The five board seat agents now pass Antigravity's agent validator.

The five board seat agents (cb-adversary, cb-data, cb-feeling, cb-observer, cb-truth) declared their tools: field as a comma-separated string, which Antigravity's loader cannot read as a list. The field is now a YAML list. Claude Code accepts either form, so Claude Code users see no change. The instrument is agy plugin validate, run on a temporary copy of the built plugin with a root plugin.json added, because CoalBoard's shipped plugin has no root plugin.json and agy does not load it as is. CoalBoard's documented Antigravity route is unchanged: the skill folder copy in the README, which never used these agent files. Antigravity does not run the board's seats.

Fixed

• The five board seat agents pass Antigravity's agent validator. Before: agy 1.4.8 validate reported line 3: cannot unmarshal !!str `Read, G...` into []string. The loader skips this agent for each of the five agents. The tools: field is now a YAML list, and the validate test finds no error finding on the built plugin. Claude Code accepts both forms in its subagent frontmatter (code.claude.com/docs/en/sub-agents: "as a comma-separated string such as Read, Grep, Bash or a YAML list"). — test: scripts/agy-validate.test.mjs