docs: add canonical IA landing + first-pass core pages

docs/08-agents-and-skills.md

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+# Agents & skills
+
+This page explains the automation model as it appears in Mission Control.
+
+## Agent lifecycle (conceptual)
+- An **agent** checks in to Mission Control (often on a schedule) and posts work results as task comments.
+- In OpenClaw terms, agents can run:
+  - **heartbeats** (periodic loops)
+  - **cron jobs** (scheduled runs; better for exact timing / isolation)
+
+## Heartbeats vs cron
+- Use **heartbeat** for batched checks and context-aware incremental work.
+- Use **cron** for exact timing and isolated, standalone actions.
+
+## Skills (how to think about them)
+- A skill is a packaged workflow/tooling instruction set that agents can follow.
+- Skills typically define:
+  - when to use them
+  - required binaries/services
+  - command patterns
+
+## Where this connects in the repo
+- Gateway protocol: [docs/openclaw_gateway_ws.md](openclaw_gateway_ws.md)
+- Gateway base config: [docs/openclaw_gateway_base_config.md](openclaw_gateway_base_config.md)
+
+## Next
+- Add repo-specific guidance for authoring skills and where they live (once standardized).