fix(hermes): align with Hermes Agent conventions per docs review

Four fixes from review of hermes-agent.nousresearch.com docs:

1. SKILL.md frontmatter now declares `version` (required field per
   Hermes spec). Plumbed through `convertClaudeCommandToClaudeSkill`
   gated on runtime='hermes' so other runtimes' frontmatter is unchanged.

2. Project-context filename rewrite changed from `HERMES.md` (not
   discovered by Hermes) to `.hermes.md` (top of Hermes' discovery list:
   .hermes.md → AGENTS.md → CLAUDE.md → .cursorrules).

3. README + finishInstall now show `/gsd-help` and `/gsd-new-project`
   for Hermes; per docs, Hermes auto-exposes skills as slash commands.

4. Hermes tests now parse SKILL.md frontmatter structurally via the
   shared parseFrontmatter helper instead of substring-matching source
   text, and assert the version/name/description shape required by
   Hermes' skill_view().

Full suite: 6128/6128 pass (3 new structural assertions).

README.md

@@ -108,8 +108,7 @@ The installer prompts you to choose:
 2. **Location** — Global (all projects) or local (current project only)
 
 Verify with:
-- Claude Code / Gemini / Copilot / Antigravity / Qwen Code: `/gsd-help`
-- Hermes Agent: ask the agent to use `gsd-help` (skills are natural-language-triggered)
+- Claude Code / Gemini / Copilot / Antigravity / Qwen Code / Hermes Agent: `/gsd-help`
 - OpenCode / Kilo / Augment / Trae / CodeBuddy: `/gsd-help`
 - Codex: `$gsd-help`
 - Cline: GSD installs via `.clinerules` — verify by checking `.clinerules` exists