chore(pgpm): use BoilerplateSkill from genomic@5.5.0

[pyramation]

Summary

Removes the local BoilerplateSkill interface and skills field from pgpm/core's BoilerplateConfig — these now live upstream in genomic's base BoilerplateConfig (genomic@5.5.0, published from dev-utils#87).

- export interface BoilerplateSkill { source: string; skills: string[]; }
- export interface BoilerplateConfig extends GenomicBoilerplateConfig {
-   requiresWorkspace?: WorkspaceType;
-   skills?: BoilerplateSkill[];
- }
+ export type { BoilerplateSkill } from 'genomic';  // re-export for consumers
+ export interface BoilerplateConfig extends GenomicBoilerplateConfig {
+   requiresWorkspace?: WorkspaceType;
+   // skills inherited from GenomicBoilerplateConfig
+ }

BoilerplateSkill is re-exported from @pgpmjs/core so existing imports (e.g. in pgpm/cli installSkills) continue to work without changes.

Also bumps genomic from ^5.4.0 → ^5.5.0 in pgpm/core and pgpm/cli.

Link to Devin session: https://app.devin.ai/sessions/8a70e4bc95b947faa41db21e02ed818e
Requested by: @pyramation

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