Add CastCodes build-out skills

[BunsDev]

Summary

• Add five repo-local CastCodes skills for rebrand safety, fork-local service boundaries, dev-loop verification, UI work, and plugin-host development.
• Include agents/openai.yaml metadata and focused one-level reference maps for each skill.
• Keep the implementation scoped to .agents/skills with no plugin scaffold or marketplace metadata.

Test Plan

• quick_validate.py for all 5 new skills using a temporary /tmp venv with PyYAML
• git diff --check
• Explicit whitespace check over new untracked skill files before staging
• Placeholder/TODO scan over .agents/skills/castcodes-*
• Frontmatter readback for hyphen-case names and description length

[Copilot]

Pull request overview

Adds a set of CastCodes-specific, repo-local agent skills to guide work on rebrand-sensitive surfaces, OSS/hosted-service boundaries, local verification workflows, UI changes, and plugin-host development—scoped to .agents/skills as documented in the PR description.

Changes:

• Added 5 new CastCodes skills (castcodes-*) with structured workflows and verification guidance.
• Added focused one-level “reference map” docs for each skill to speed up codebase navigation.
• Added agents/openai.yaml metadata for each new skill to support agent UI/display integration.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
.agents/skills/castcodes-ui-work/SKILL.md	Defines the CastCodes UI workflow/rules and verification commands.
.agents/skills/castcodes-ui-work/references/ui-map.md	UI ownership/navigation map and targeted ripgrep checks for UI work.
.agents/skills/castcodes-ui-work/agents/openai.yaml	Agent interface metadata for the UI work skill.
.agents/skills/castcodes-rebrand-surface/SKILL.md	Rebrand surface contract + classification/verification workflow.
.agents/skills/castcodes-rebrand-surface/references/repo-map.md	Rebrand-sensitive repo map + targeted search patterns.
.agents/skills/castcodes-rebrand-surface/agents/openai.yaml	Agent interface metadata for the rebrand surface skill.
.agents/skills/castcodes-plugin-host/SKILL.md	Plugin-host/MCP/plugin-manager guidance with OSS boundary constraints.
.agents/skills/castcodes-plugin-host/references/plugin-map.md	Plugin-host code area map + search/test hints.
.agents/skills/castcodes-plugin-host/agents/openai.yaml	Agent interface metadata for the plugin host skill.
.agents/skills/castcodes-fork-local-boundary/SKILL.md	OSS fork-local hosted-service boundary guidance + verification.
.agents/skills/castcodes-fork-local-boundary/references/service-boundaries.md	Hosted-service seam map + targeted searches and OSS rules.
.agents/skills/castcodes-fork-local-boundary/agents/openai.yaml	Agent interface metadata for the fork-local boundary skill.
.agents/skills/castcodes-dev-loop/SKILL.md	Guidance for selecting focused local verification/build commands.
.agents/skills/castcodes-dev-loop/references/commands.md	Command map for common CastCodes workflows (build/test/bundle).
.agents/skills/castcodes-dev-loop/agents/openai.yaml	Agent interface metadata for the dev-loop skill.

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