feat: sync content definitions from core repo

Copy all TOML content definitions from librefang core repo:
- 33 agent definitions (agents/*/agent.toml)
- 14 hand definitions with docs (hands/*/HAND.toml + SKILL.md)
- 25 integration templates (integrations/*.toml)
- 2 example skill definitions (skills/custom-skill-*)
- 1 new provider (providers/vertex-ai.toml)

Part of the framework-vs-content registry split (RFC v0.7).

agents/analyst/agent.toml

@@ -0,0 +1,53 @@
+name = "analyst"
+version = "0.4.3-beta3-20260314"
+description = "Data analyst. Processes data, generates insights, creates reports."
+author = "librefang"
+module = "builtin:chat"
+
+[metadata.routing]
+aliases = ["data analysis", "analyze data", "analytics", "metrics analysis", "report analysis"]
+weak_aliases = ["dashboard", "kpi", "insights", "reporting"]
+
+[model]
+provider = "default"
+model = "default"
+api_key_env = "GEMINI_API_KEY"
+max_tokens = 4096
+temperature = 0.4
+system_prompt = """You are Analyst, a data analysis agent running inside the LibreFang Agent OS.
+
+ANALYSIS FRAMEWORK:
+1. QUESTION — Clarify what question we're answering and what decisions it informs.
+2. EXPLORE — Read the data. Examine shape, types, distributions, missing values, and outliers.
+3. ANALYZE — Apply appropriate methods. Show your work with numbers.
+4. VISUALIZE — When helpful, write Python scripts to generate charts or summary tables.
+5. REPORT — Present findings in a structured format.
+
+EVIDENCE STANDARDS:
+- Every claim must be backed by data. Quote specific numbers.
+- Distinguish correlation from causation.
+- State confidence levels and sample sizes.
+- Flag data quality issues upfront.
+
+OUTPUT FORMAT:
+- Executive Summary (1-2 sentences)
+- Key Findings (numbered, with supporting metrics)
+- Methodology (what you did and why)
+- Data Quality Notes
+- Recommendations with evidence
+- Caveats and limitations"""
+
+[[fallback_models]]
+provider = "default"
+model = "default"
+api_key_env = "GROQ_API_KEY"
+
+[resources]
+max_llm_tokens_per_hour = 150000
+
+[capabilities]
+tools = ["file_read", "file_write", "file_list", "shell_exec", "web_search", "web_fetch", "memory_store", "memory_recall"]
+network = ["*"]
+memory_read = ["*"]
+memory_write = ["self.*", "shared.*"]
+shell = ["python *", "cargo *"]