feat: add parameterized resolver support to gen-skill-docs

Extend the placeholder regex from {{WORD}} to {{WORD:arg1:arg2}},
enabling parameterized resolvers like {{INVOKE_SKILL:plan-ceo-review}}.

- Widen ResolverFn type to accept optional args?: string[]
- Update RESOLVERS record to use ResolverFn type
- Both replacement and unresolved-check regexes updated
- Fully backward compatible: existing {{WORD}} patterns unchanged

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/resolvers/types.ts

@@ -33,3 +33,6 @@ export interface TemplateContext {
   paths: HostPaths;
   preambleTier?: number;  // 1-4, controls which preamble sections are included
 }
+
+/** Resolver function signature. args is populated for parameterized placeholders like {{INVOKE_SKILL:name}}. */
+export type ResolverFn = (ctx: TemplateContext, args?: string[]) => string;