docs: sync README and plans with v0.5.x features

Document multi-instance closures, tuples, Iter HOF, diagnostics, and
updated test targets. Refresh QUALITY_PLAN diagnosis and next-day backlog.
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# Bux Language Roadmap — New Constructs
> **Updated:** 2026-06-09 | **Status:** In Progress
> **Updated:** 2026-07-15 | **Status:** In Progress
> Recent: multi-instance closures (fat `BuxFn`), tuples in selfhost, Iter map/filter/fold, Rust-style diagnostics.
This document tracks planned language constructs beyond Phase 8 strategy.