docs: add README for every subdirectory

33 agent READMEs, 14 hand READMEs, 2 plugin READMEs
(echo-memory + hooks), and 2 skill READMEs
(custom-skill-prompt + custom-skill-python).

Each README documents the component's purpose, configuration,
and usage based on its TOML definition.

hands/lead/README.md

@@ -0,0 +1,33 @@
+# Lead Hand
+
+Autonomous lead generation -- discovers, enriches, and delivers qualified leads on a schedule.
+
+## Configuration
+
+| Field | Value |
+|-------|-------|
+| Category | `data` |
+| Agent | `lead-hand` |
+| Routing | `lead generation`, `prospect list`, `find customers`, `contact enrichment` |
+
+## Integrations
+
+None required.
+
+## Settings
+
+- **Target Industry** -- Industry vertical to focus on
+- **Target Role** -- Decision-maker titles to target
+- **Company Size** -- `any`, `startup`, `smb`, `enterprise`
+- **Lead Source** -- `web_search`, `linkedin_public`, `crunchbase`, `custom`
+- **Output Format** -- `csv`, `json`, `markdown_table`
+- **Leads Per Report** -- `10`, `25`, `50`, `100`
+- **Delivery Schedule** -- `daily_7am`, `daily_9am`, `weekdays_8am`, `weekly_monday`
+- **Geographic Focus** -- Region to prioritize
+- **Enrichment Depth** -- `basic`, `standard`, `deep`
+
+## Usage
+
+```bash
+librefang hand run lead
+```