docs: sync stdlib roadmap — Maps/JSON/Date now Shipped

[hyperpolymath]

The ecosystem roadmap table still listed Maps/JSON/Date stdlib as 🔄 Planned / In flight although the work merged:

Area	Issue	Merged via
Maps / dict (map_*)	#46 (closed)	PR #49
JSON (json_parse/json_stringify)	#47 (closed)	PR #53
Date (date_today)	#48 (closed)	PR #54

IMPLEMENTATION.md already documents these as builtins and the implementation registry (crates/my-lang/src/stdlib.rs) is the machine source of truth — this only aligns the human-facing roadmap so docs are consistent across both surfaces.

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 35 issues detected

Severity	Count
🔴 Critical	6
🟠 High	11
🟡 Medium	18

⚠️ Action Required: Critical security issues found!

View findings

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