Port format-spec files from geo-scout into webrunner inputs

Enables AI-assisted creation of targets.yaml and countries.yaml — drop either spec into context to generate valid input files

modules/webrunner/inputs/countries-format.md

@@ -0,0 +1,77 @@
+# countries.yaml — Format Specification
+
+## Purpose
+Defines which countries to scan and scan parameters per country.
+This file is read by WEBRUNNER at runtime. The scanner resolves each
+country code to its CIDR ranges using RIR delegated stats files.
+
+## Schema
+
+```yaml
+scan_profile:
+  name: string                  # Label for this profile (used in logs/reports)
+  rate: integer                 # masscan packets/sec (default: 1000, max: 100000)
+  max_hosts_per_country: integer|null  # Cap IPs per country. null = no limit
+
+countries:
+  - code: string                # ISO 3166-1 alpha-2 (e.g. US, VE, NL, GB, NG)
+    priority: high|medium|low   # Scan order. high = first
+    exclude_cidrs:              # Optional CIDR blocks to skip within this country
+      - "x.x.x.x/xx"
+    notes: string               # Optional context (not used by scanner)
+```
+
+## Rules
+
+- `code` must be a valid ISO 3166-1 alpha-2 code
+- GB is the correct code for United Kingdom (not UK)
+- `rate` applies globally to the masscan run, not per-country
+- `exclude_cidrs` entries must be valid CIDR notation
+- Countries are scanned in priority order: high → medium → low
+- Within same priority, order in the list is preserved
+
+## Valid priority values
+`high` | `medium` | `low`
+
+## Common country codes
+| Country | Code |
+|---------|------|
+| United States | US |
+| United Kingdom | GB |
+| Venezuela | VE |
+| Netherlands | NL |
+| Canada | CA |
+| Nigeria | NG |
+| Russia | RU |
+| Germany | DE |
+| China | CN |
+| Brazil | BR |
+| Iran | IR |
+| India | IN |
+| France | FR |
+| Australia | AU |
+
+## Example
+
+```yaml
+scan_profile:
+  name: "latam-europe-sweep"
+  rate: 2000
+  max_hosts_per_country: 100000
+
+countries:
+  - code: VE
+    priority: high
+    exclude_cidrs: []
+    notes: "Primary target"
+
+  - code: US
+    priority: medium
+    exclude_cidrs:
+      - "10.0.0.0/8"
+      - "172.16.0.0/12"
+      - "192.168.0.0/16"
+
+  - code: NL
+    priority: low
+```