feat(skills): add filters skill

[marekgieldatsh]

No description provided.

[Copilot]

Pull request overview

Adds a new “Implementing Filters” skill to the Copilot Collections skill set, providing guidance for type-safe URL-synced filters (schema, serialization, hooks, and navigation strategy) plus framework-specific references.

Changes:

• Introduces the new .github/skills/tsh-implementing-filters/ skill with a full SKILL guide and React Router / Next.js reference docs.
• Adds a new website docs page for the skill and links the skill from related existing skills.
• Updates the tsh-software-engineer agent to include the new skill in its “Skills Usage Guidelines”.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
website/docs/skills/implementing-filters.md	Adds the documentation page for the new skill (sidebar + key areas + connected skills).
.github/skills/tsh-writing-hooks/SKILL.md	Links to tsh-implementing-filters as a connected skill (hook composition tie-in).
.github/skills/tsh-implementing-frontend/SKILL.md	Links to tsh-implementing-filters for filter-sync patterns consumed by components.
.github/skills/tsh-implementing-forms/SKILL.md	Links to tsh-implementing-filters for form-driven filter UIs.
.github/skills/tsh-implementing-filters/references/react-patterns.md	Adds React Router v6+ patterns for reading/updating search params and binding a useFilters hook.
.github/skills/tsh-implementing-filters/references/nextjs-patterns.md	Adds Next.js App Router patterns for URL param reading/navigation and server component constraints.
.github/skills/tsh-implementing-filters/SKILL.md	Adds the main “Implementing Filters” skill content (principles, steps, checklist, API contract).
.github/agents/tsh-software-engineer.agent.md	Adds tsh-implementing-filters to the agent’s recommended skill list.