feat(install): add Hermes Agent runtime support (#2841)

Adds Hermes Agent as a supported installation target. Users can run
\`npx get-shit-done-cc --hermes\` to install all 86 GSD commands as
skills under \`~/.hermes/skills/gsd-*/SKILL.md\`, following the same
open skill standard as Claude Code 2.1.88+, Qwen Code, Antigravity,
Trae, Augment, and Codebuddy.

Hermes Agent is an open-source AI agent framework by Nous Research
(NousResearch/hermes-agent, MIT). Its skill loader accepts the Claude
skill format as-is: frontmatter parsed with PyYAML SafeLoader (unknown
keys like \`allowed-tools\` / \`argument-hint\` ignored), body XML tags
(\`<objective>\`, \`<execution_context>\`, \`<process>\`) passed directly
to the model. Compatibility proven end-to-end with all 86 GSD skills
loading cleanly, \`skill_view()\` returning full bodies, and
\`build_skills_system_prompt()\` emitting them into the agent system
prompt — zero Hermes code changes required.

Changes:
- \`bin/install.js\`: --hermes flag, getDirName/getGlobalDir/getConfigDirFromHome
  support, HERMES_HOME env var (native to Hermes — used for profile
  mode / Docker deploys), install/uninstall pipelines, interactive
  picker option 10 (alphabetical: between Gemini and Kilo), .hermes
  path replacements in copyCommandsAsClaudeSkills and
  copyWithPathReplacement, legacy commands/gsd cleanup, CLAUDE.md ->
  HERMES.md and "Claude Code" -> "Hermes Agent" content rewrites in
  skills/agents/hooks, runtime-appropriate finish message.
- \`get-shit-done/bin/lib/core.cjs\`: add hermes to KNOWN_RUNTIMES;
  add RUNTIME_PROFILE_MAP.hermes with OpenRouter-slug defaults
  (Hermes is provider-agnostic; these defaults resolve across
  OpenRouter, native Anthropic, and Copilot via Hermes' aggregator-
  aware resolver, and are overridable per-tier via
  model_profile_overrides.hermes.{opus,sonnet,haiku}).
- \`README.md\`: Hermes Agent in tagline, runtime list, verification
  command, install/uninstall examples, \`--hermes\` flag reference.
- \`tests/hermes-install.test.cjs\`: new, 14 tests covering directory
  mapping, HERMES_HOME env var precedence, install/uninstall
  lifecycle, user-skill preservation, engine cleanup.
- \`tests/hermes-skills-migration.test.cjs\`: new, 11 tests covering
  frontmatter conversion, path replacement (~/.claude/ ->
  \$HERMES_HOME/skills/), CLAUDE.md -> HERMES.md, "Claude Code" ->
  "Hermes Agent", stale skill cleanup, SKILL.md format validation.
- \`tests/multi-runtime-select.test.cjs\`: updated for new option
  numbering (hermes=10, kilo=11, opencode=12, qwen=13, trae=14,
  windsurf=15, all=16).
- \`tests/kilo-install.test.cjs\`: updated assertions for Kilo having
  moved from option 10 to option 11.

Closes #2841

Implementation notes:
- Zero custom code paths: Hermes reuses copyCommandsAsClaudeSkills()
  identical to Qwen Code / Antigravity pattern.
- Path replacement: ~/.claude/, \$HOME/.claude/, ./.claude/ ->
  .hermes equivalents in skill/agent/hook content.
- Config precedence: --config-dir > HERMES_HOME > ~/.hermes (matches
  how Hermes itself resolves its home directory).
- Legacy cleanup: removes commands/gsd/ if present from a prior
  install, preserving dev-preferences.md (same as Qwen).
- No external dependencies added.

Testing: 5841 / 5841 tests pass (0 failures, 0 regressions)
- 14 new tests in hermes-install.test.cjs
- 11 new tests in hermes-skills-migration.test.cjs
- multi-runtime-select.test.cjs renumbered + 1 new test (single choice for hermes)

README.md

@@ -4,7 +4,7 @@
 
 **English** · [Português](README.pt-BR.md) · [简体中文](README.zh-CN.md) · [日本語](README.ja-JP.md) · [한국어](README.ko-KR.md)
 
-**A light-weight and powerful meta-prompting, context engineering and spec-driven development system for Claude Code, OpenCode, Gemini CLI, Kilo, Codex, Copilot, Cursor, Windsurf, Antigravity, Augment, Trae, Qwen Code, Cline, and CodeBuddy.**
+**A light-weight and powerful meta-prompting, context engineering and spec-driven development system for Claude Code, OpenCode, Gemini CLI, Kilo, Codex, Copilot, Cursor, Windsurf, Antigravity, Augment, Trae, Qwen Code, Hermes Agent, Cline, and CodeBuddy.**
 
 **Solves context rot — the quality degradation that happens as Claude fills its context window.**
 
@@ -104,11 +104,12 @@ npx get-shit-done-cc@latest
 ```
 
 The installer prompts you to choose:
-1. **Runtime** — Claude Code, OpenCode, Gemini, Kilo, Codex, Copilot, Cursor, Windsurf, Antigravity, Augment, Trae, Qwen Code, CodeBuddy, Cline, or all (interactive multi-select — pick multiple runtimes in a single install session)
+1. **Runtime** — Claude Code, OpenCode, Gemini, Kilo, Codex, Copilot, Cursor, Windsurf, Antigravity, Augment, Trae, Qwen Code, Hermes Agent, CodeBuddy, Cline, or all (interactive multi-select — pick multiple runtimes in a single install session)
 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)
 - OpenCode / Kilo / Augment / Trae / CodeBuddy: `/gsd-help`
 - Codex: `$gsd-help`
 - Cline: GSD installs via `.clinerules` — verify by checking `.clinerules` exists
@@ -179,6 +180,10 @@ npx get-shit-done-cc --trae --local         # Install to ./.trae/
 npx get-shit-done-cc --qwen --global        # Install to ~/.qwen/
 npx get-shit-done-cc --qwen --local         # Install to ./.qwen/
 
+# Hermes Agent
+npx get-shit-done-cc --hermes --global      # Install to ~/.hermes/ (honors $HERMES_HOME)
+npx get-shit-done-cc --hermes --local       # Install to ./.hermes/
+
 # CodeBuddy
 npx get-shit-done-cc --codebuddy --global   # Install to ~/.codebuddy/
 npx get-shit-done-cc --codebuddy --local    # Install to ./.codebuddy/
@@ -192,7 +197,7 @@ npx get-shit-done-cc --all --global      # Install to all directories
 ```
 
 Use `--global` (`-g`) or `--local` (`-l`) to skip the location prompt.
-Use `--claude`, `--opencode`, `--gemini`, `--kilo`, `--codex`, `--copilot`, `--cursor`, `--windsurf`, `--antigravity`, `--augment`, `--trae`, `--qwen`, `--codebuddy`, `--cline`, or `--all` to skip the runtime prompt.
+Use `--claude`, `--opencode`, `--gemini`, `--kilo`, `--codex`, `--copilot`, `--cursor`, `--windsurf`, `--antigravity`, `--augment`, `--trae`, `--qwen`, `--hermes`, `--codebuddy`, `--cline`, or `--all` to skip the runtime prompt.
 The GSD SDK CLI (`gsd-sdk`) is installed automatically (required by `/gsd-*` commands). Pass `--no-sdk` to skip the SDK install, or `--sdk` to force a reinstall.
 
 </details>