feat: add Google Maps Platform Agent Skill (AgentSkills.io spec)

[ryanbaumann]

Summary

Adds a Google Maps Platform Agent Skill following the AgentSkills.io v1.0 specification. This skill embeds foundational context directly into skill-aware agents, reducing latency by eliminating the need for an extra retrieve-instructions tool call before each query.

Key Benefits

• Reduced Latency: Context loaded at startup, not on every query
• Improved Reliability: Works even if backend RAG service is slow/unavailable
• Progressive Disclosure: Only loads detailed reference files when needed
• Cross-Platform: Compatible with Claude Code, Cursor, Windsurf, Roo Code, Gemini CLI, Codex

Files Added

File	Description
skills/google-maps-platform/SKILL.md	Core skill with AgentSkills.io frontmatter (~3500 tokens)
skills/google-maps-platform/references/code-examples.md	Web/Android/iOS/Flutter examples with attribution IDs
skills/google-maps-platform/references/decision-trees.md	ASCII decision trees for API selection
skills/google-maps-platform/references/eea-compliance.md	EU Digital Markets Act requirements
skills/google-maps-platform/references/attribution.md	Attribution ID integration guide
BACKLOG.md	Deprecation plan for retrieve-instructions tool (v1.0)

Files Modified

File	Change
package.json	Added "skills" to files array for npm bundling
README.md	Added Agent Skill section with installation instructions
CHANGELOG.md	Added [Unreleased] section with feature documentation

Testing

• ✅ npm run build - Passed (bundled 465 modules)
• ✅ npm test - 43 tests passed, 0 failed

Attribution

All code examples include the required attribution ID: gmp_mcp_codeassist_v0.1_github

Notes

• The retrieve-instructions tool is NOT deprecated in this PR (per user request)
• Tool description changes deferred to future PR
• PLAN.md excluded from commit (planning document only)

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• packages/code-assist/README.md:62, tag maps_AgentSkill

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