* test(#1178): consolidate duplicated agent-roster helper into tests/helpers
The "list gsd-*.md agent files, strip .md, sort" derivation was hand-duplicated
across the suite (two listAgentFiles(), an identical agentFilesOnDisk(), and
inline readdir blocks). Add tests/helpers/agent-roster.cjs exporting
listAgentFiles(agentsDir?) and route the genuinely-identical source-roster sites
through it. Semantically-different sites (installed-dest dirs, absolute-path
returns, .toml-inclusive Codex rosters, full-.md-filename readers, the uniform
multi-family inventory table) are left intact, each with a one-line comment.
Test-only; no production code touched.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* test(#1178): note AGENTS_DIR export is for future call sites
Review nit: clarify that the currently-unused AGENTS_DIR export is intentional
— available for future tests needing the canonical source agents path.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: Tom Boucher <trekkie@nomorestars.com>
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