feat: add Hermes Agent integration (skills workspaces + external_dirs)`

[justyork]

What does this PR do?

Adds Hermes Agent as a supported integration platform, following the same workspace model as OpenClaw.

• scripts/convert.sh: shared write_agent_workspace() (SOUL / AGENTS / IDENTITY split) used by OpenClaw and Hermes; new convert_hermes() emits SKILL.md plus workspace files under integrations/hermes/<slug>/.
• scripts/install.sh: install_hermes() copies workspaces to ~/.hermes/agency-agents/ and registers skills.external_dirs in ~/.hermes/config.yaml (safe in-place edit, not EOF append).
• Docs: integrations/hermes/README.md, updates to root README.md, integrations/README.md, and CONTRIBUTING.md.
• .gitignore: generated integrations/hermes/*/ excluded (only integrations/hermes/README.md is committed).

Each Agency agent becomes a Hermes skill discoverable via /skill-slug and hermes chat --toolsets skills, with persona/ops content loaded from bundled SOUL.md / AGENTS.md via ${HERMES_SKILL_DIR} (progressive disclosure).

Not included: generated skill workspaces (~184 directories); users run ./scripts/convert.sh --tool hermes locally.

Agent Information (if adding/modifying an agent)

N/A — this PR adds a tool integration, not a new agent markdown file.

Integration Information

Item	Value
Platform	Hermes Agent
Pattern	OpenClaw-style per-agent workspace + Hermes SKILL.md entry point
Install target	~/.hermes/agency-agents/<slug>/
Discovery	skills.external_dirs → ~/.hermes/agency-agents
Activation	/frontend-developer, hermes chat --toolsets skills -q "Use the … skill …"

Motivation

Hermes uses a skills system (SKILL.md, agentskills.io-compatible) and understands SOUL.md / AGENTS.md, but only one global ~/.hermes/SOUL.md per instance. The Agency roster needs per-specialist personas, so a flat skill workspace per agent (with external_dirs) matches Hermes architecture better than a single monolithic skill or overwriting global SOUL.

Testing

Tested on two environments:

Environment	Notes
Windows (Git Bash)	convert.sh / install.sh; paths and workspace layout verified
Ubuntu 24.04 (VPS)	Full pipeline + Hermes CLI; clean install after removing prior agency-agents paths and fixing config

./scripts/convert.sh --tool hermes   # → 184 workspaces under integrations/hermes/
bash -n scripts/convert.sh scripts/install.sh
./scripts/install.sh --tool hermes --no-interactive

• Convert: 184 agents converted successfully (Windows and Ubuntu 24.04 VPS).
• Install: 184 workspaces copied to ~/.hermes/agency-agents/.
• Config: skills.external_dirs receives ~/.hermes/agency-agents under the skills: section. Installer replaces default external_dirs: [] with a valid block list (does not append list items after [] or at EOF).
• Sample workspace (frontend-developer, ux-researcher): SKILL.md, SOUL.md, AGENTS.md, IDENTITY.md; ${HERMES_SKILL_DIR} in Procedure.
• Git: only script/doc changes + integrations/hermes/README.md committed (no generated slug directories).

Ubuntu 24.04 VPS (Hermes CLI):

• Clean reinstall: removed ~/.hermes/agency-agents and prior broken config lines, then convert + install again.
• hermes skills list — Agency skills visible, no config.yaml parse errors.
• Activating a skill (e.g. /ux-researcher) loads full bundled context (SOUL + AGENTS via skill procedure).

hermes skills list | grep -E 'frontend-developer|ux-researcher'
hermes chat --toolsets skills -q "Use the frontend-developer skill and summarize its role in one sentence."

Checklist

• No generated integration output committed (only integrations/hermes/README.md)
• convert.sh and install.sh updated; hermes added to tool lists / parallel convert
• Documented in README.md and integrations/README.md
• Tested convert.sh --tool hermes and install.sh --tool hermes on Windows (Git Bash) and Ubuntu 24.04 (VPS)
• Tested with Hermes CLI on VPS (skills list, skill activation, full skill content)
• Clean install path verified on VPS
• OpenClaw converter refactored to shared write_agent_workspace() (no behavior change intended)
• Follows the agent template structure from CONTRIBUTING.md (N/A — integration PR)
• Includes YAML frontmatter with name, description, color (N/A — integration PR)
• Has concrete code/template examples (for new agents) (N/A — integration PR)

Notes for maintainers

• Aligns with CONTRIBUTING guidance for new platforms; happy to open a Discussion retroactively if preferred before merge.
• ensure_hermes_external_dir() fixes (follow-up to initial integration):
  • Does not append - ~/.hermes/agency-agents at EOF of config.yaml.
  • Inserts under skills.external_dirs; replaces external_dirs: [] with block-list form.
  • Warns if agency-agents appears outside a valid external_dirs list (e.g. after external_dirs: []).
• Recovery notes for broken configs: integrations/hermes/README.md (Fix broken config.yaml).