fix: always show agent switcher and provide create-agent path in UI

[chubes4]

Summary

Commit 1: Agent Switcher Visibility

• AgentSwitcher was hidden when ≤1 agent existed, making it impossible to select the sole agent — all agent-dependent tabs (Memory, Manage, System Tasks, Tools) showed empty "Select an agent" messages with no way to do so
• Now always renders when ≥1 agent exists (even single-agent installs need to see which agent is active)
• Auto-selects the sole agent when only one exists and none is selected
• Adds a + Create Agent option at the bottom of the dropdown — available on all pages that use the switcher (Agents, Pipelines, Jobs)
• Shows a Create Agent button when zero agents exist (first-run experience)
• Extracts CreateAgentModal into a shared component so both the switcher and the Agent list tab can reuse it
• Newly created agents are auto-selected in the store

Commit 2: Shared Layer, Agent Scoping, Layer Grouping

Memory tab — shared layer (SITE.md):

• AgentFileAbilities::executeListAgentFiles() now scans the shared directory in addition to agent and user dirs
• Each file is tagged with a layer field (shared, agent, user)
• resolveFilePath() also checks the shared directory so SITE.md can be read
• REST endpoint now forwards agent_id from request to abilities (was only passing user_id)
• UI groups files into Site / Agent / User sections with small header labels
• Shared files are shown without delete button (read-only in the sidebar)

Pipeline & Flow creation — agent_id scoping:

• Pipelines::handle_create_pipeline() now carries agent_id from the interceptor to the ability
• Flows::handle_create_flow() same fix
• Front-end createPipeline() and createFlow() include agent_id from the Zustand store in the POST body
• Without this, new pipelines/flows created while an agent was selected got agent_id=NULL and became invisible

Data fix (manual):

• Existing pipelines/flows with agent_id=NULL assigned to chubes-bot (agent_id=3) via DB update

[github-actions]

Homeboy Results — data-machine

Lint

⚡ Scope: changed files only

✅ lint (changed files only)

Test

⚡ Scope: changed files only

✅ test (changed files only)

Audit

⚡ Scope: changed files only

✅ audit (changed files only)

Tooling versions

• Homeboy CLI: homeboy 0.74.1+1b1cb274
• Extension: wordpress from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: unknown
• Action: Extra-Chill/homeboy-action@v1

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Homeboy Action v1