System Prompt as the Default Sovereign Browser Skill

Goal

The system prompt on sovereign://agents is essentially the default skill for sovereign_browser. Instead of having a separate "System Prompt" field, we treat it as an unsaved skill that the user can edit, save, and share — matching how ai.html handles skills.

Current state

sovereign://agents (config page) has a "System Prompt" textarea saved to sovereign_browser.agent.system_prompt in the d:user-settings event.
sovereign://agents/chat has a skills list (kind 31123) with checkboxes.
The agent loop (agent_loop.c) uses the system prompt from settings, OR the concatenated templates of selected skills (if any skills are selected).

Desired state

Rename "System Prompt" to "Sovereign Browser Skill" on the config page.
The system prompt is presented as an unsaved skill — a skill that exists locally but hasn't been published to Nostr yet.
In the chat page, the "Sovereign Browser Skill" appears in the skills list as an unsaved skill (with a "Save" button to publish it as kind 31123).
The user can edit the skill (name, description, template, tools) inline, matching ai.html's renderSkillsEditor() pattern.
The user can save the skill to Nostr (publishes kind 31123), making it available to other apps (client, didactyl).
The user can modify saved skills the same way (if they're the author).

Design

On `sovereign://agents` (config page)

Replace the "System Prompt" section with a "Sovereign Browser Skill" section:

┌─────────────────────────────────────────────┐
│ Sovereign Browser Skill                     │
├─────────────────────────────────────────────┤
│ Name: [Sovereign Browser Default      ]     │
│ Description: [Default agent skill     ]     │
│ Template:                                   │
│ ┌───────────────────────────────────────┐   │
│ │ You are an AI assistant embedded in   │   │
│ │ a web browser. You have access to...  │   │
│ └───────────────────────────────────────┘   │
│ Requires tools: [browser, fs, shell   ]     │
│                                              │
│ [💾 Save as Skill]  (publishes to Nostr)    │
└─────────────────────────────────────────────┘

The template is the current system prompt value.
"Save as Skill" publishes a kind 31123 event with the skill content.
The skill is saved to sovereign_browser.agent.system_prompt locally (as now) AND optionally published to Nostr as a skill.

On `sovereign://agents/chat` (chat page)

The skills list shows:

Sovereign Browser Skill (unsaved) — always at the top, with a checkbox (selected by default), an edit button, and a "Save" button.
Saved skills (kind 31123) — fetched from Nostr, with checkboxes, edit buttons (if user-authored), and delete buttons.

When the user selects the Sovereign Browser Skill, its template is used as the system prompt (concatenated with any other selected skills, matching the existing agent_skills_build_system_prompt() logic).

Skill editor (matching ai.html)

When the user clicks "Edit" on a skill (or the Sovereign Browser Skill), an inline editor expands (like ai.html's renderSkillsEditor()):

▼ Sovereign Browser Default
  ┌──────────────────────────────────────────┐
  │ Name:    [Sovereign Browser Default    ] │
  │ Description: [Default agent skill      ] │
  │ Template:                                │
  │ ┌────────────────────────────────────┐   │
  │ │ You are an AI assistant embedded...│   │
  │ └────────────────────────────────────┘   │
  │ Requires tools: [browser, fs, shell  ]   │
  │                                          │
  │ [💾 Save / Update]  [Cancel]             │
  └──────────────────────────────────────────┘

For the Sovereign Browser Skill (unsaved): "Save" publishes it to Nostr as a new kind 31123 event AND updates the local system prompt.
For saved skills (user-authored): "Save / Update" re-publishes the kind 31123 event with the edited content.
For saved skills (not user-authored): "View Only (not your skill)" — no edit, matching ai.html's canSave logic.

Implementation

Phase 1 — Rename + restructure the config page

www/agents/config.html + config.js — Replace the "System Prompt" section with a "Sovereign Browser Skill" section with Name, Description, Template, and Requires Tools fields. Add a "Save as Skill" button.
src/nostr_bridge.c — Update handle_agents_set() to handle the new skill fields (agent.skill_name, agent.skill_description, agent.skill_template, agent.skill_requires_tools). These are saved to sovereign_browser.agent in the d:user-settings event (replacing the old system_prompt field).
src/agent_loop.c — Update the system prompt logic: use sovereign_browser.agent.skill_template as the default system prompt (instead of system_prompt). If skills are selected, concatenate their templates (as now).

Phase 2 — Show the Sovereign Browser Skill in the chat page

www/agents/chat.js — In renderSkillList(), add the Sovereign Browser Skill at the top of the list as an "unsaved" skill. It has:
- A checkbox (selected by default)
- The skill name (from sovereign_browser.agent.skill_name)
- An "Edit" button that opens the inline editor
- A "Save" button that publishes it to Nostr
src/agent_skills.c — Add a function agent_skills_get_default() that returns the Sovereign Browser Skill from the local settings (not from Nostr). This is used by the chat page to show the unsaved skill.
src/nostr_bridge.c — Add a sovereign://agents/skills/default endpoint that returns the Sovereign Browser Skill from settings.

Phase 3 — Skill editor in the chat page

www/agents/chat.js — Implement renderSkillEditor(skill) matching ai.html's renderSkillsEditor():
- Expandable <details> for each selected skill
- Name, Description, Template, Requires Tools fields
- "Save / Update" button (for user-authored or unsaved skills)
- "View Only" for skills not authored by the user
src/nostr_bridge.c — Add a sovereign://agents/skills/update endpoint that re-publishes an existing skill (kind 31123) with edited content. For the Sovereign Browser Skill, this also updates the local settings.
src/agent_skills.c — Add agent_skills_update(d_tag, name, description, content, requires_tools) that fetches the existing skill event, updates its content, re-signs, and re-publishes.

Phase 4 — Wire the default skill into the agent loop

src/agent_loop.c — The system prompt is now:
- If the Sovereign Browser Skill is selected (default): use its template
- If other skills are selected: concatenate their templates
- If no skills selected: use the Sovereign Browser Skill template as fallback (it's always the default)
src/agent_skills.c — Update agent_skills_build_system_prompt() to always include the Sovereign Browser Skill template (either as the base prompt, or concatenated with selected skills).

Files to modify

File	Change
`www/agents/config.html`	Rename "System Prompt" to "Sovereign Browser Skill", restructure fields
`www/agents/config.js`	Handle new skill fields, "Save as Skill" button
`www/agents/chat.js`	Show Sovereign Browser Skill in skills list, implement skill editor
`www/agents/chat.css`	Style the skill editor (matching ai.html)
`src/nostr_bridge.c`	New endpoints: `skills/default`, `skills/update`; update `handle_agents_set()`
`src/agent_skills.c` / `.h`	`agent_skills_get_default()`, `agent_skills_update()`
`src/agent_loop.c`	Use skill template as system prompt
`src/settings.h` / `settings.c`	Rename `agent_llm_system_prompt` to `agent_skill_template`, add `agent_skill_name`, `agent_skill_description`, `agent_skill_requires_tools`

Reference

~/lt/client/www/ai.html lines 1454-1540 — renderSkillsEditor() pattern
~/lt/client/www/ai.html lines 1534-1538 — "Save / Update Skill" button
~/lt/client/www/ai.html lines 1471 — canSave logic (only author can edit)

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