fix(skills): remove phantom resource references and fix CoC links (#447)

Remove references to non-existent resource files (references/, assets/,
scripts/, examples/) from 115 skill SKILL.md files. These sections
pointed to directories and files that were never created, causing
confusion when users install skills.

Also fix broken Code of Conduct links in issue templates to use
absolute GitHub URLs instead of relative paths that 404.

plugins/documentation-generation/skills/architecture-decision-records/SKILL.md

@@ -439,10 +439,3 @@ adr link 2 "Complements" 1 "Is complemented by"
 - **Don't hide failures** - Rejected decisions are valuable
 - **Don't be vague** - Specific decisions, specific consequences
 - **Don't forget implementation** - ADR without action is waste
-
-## Resources
-
-- [Documenting Architecture Decisions (Michael Nygard)](https://cognitect.com/blog/2011/11/15/documenting-architecture-decisions)
-- [MADR Template](https://adr.github.io/madr/)
-- [ADR GitHub Organization](https://adr.github.io/)
-- [adr-tools](https://github.com/npryce/adr-tools)

plugins/documentation-generation/skills/changelog-automation/SKILL.md

@@ -570,11 +570,3 @@ Reviewed-by: @alice
 - **Don't manual edit** - Generated changelogs only
 - **Don't forget breaking changes** - Mark with `!` or footer
 - **Don't ignore CI** - Validate commits in pipeline
-
-## Resources
-
-- [Keep a Changelog](https://keepachangelog.com/)
-- [Conventional Commits](https://www.conventionalcommits.org/)
-- [Semantic Versioning](https://semver.org/)
-- [semantic-release](https://semantic-release.gitbook.io/)
-- [git-cliff](https://git-cliff.org/)

plugins/documentation-generation/skills/openapi-spec-generation/SKILL.md

@@ -1015,10 +1015,3 @@ openapi-generator-cli generate \
 - **Don't forget nullable** - Be explicit about null
 - **Don't mix styles** - Consistent naming throughout
 - **Don't hardcode URLs** - Use server variables
-
-## Resources
-
-- [OpenAPI 3.1 Specification](https://spec.openapis.org/oas/v3.1.0)
-- [Swagger Editor](https://editor.swagger.io/)
-- [Redocly](https://redocly.com/)
-- [Spectral](https://stoplight.io/open-source/spectral)