v2.9.21 — README DB & lifecycle diagrams + grouped Tags Index TOC

Added

• Database Architecture diagram (README §6.1.3, collapsible) — the YAML + SQLite coexistence engine: inventory.sql Git source-of-truth → in-memory SQLite → inventory.yaml mirror, plus the per-resource schema (core / structural / platinum lifecycle).
• Full Data Lifecycle diagram (README §6.3, collapsible) — discovery → ingestion → cached maintenance/enrichment → render → publish/deploy, with background GC.

Changed

• Technical Tags Index TOC rebuilt: grouped into Maturity and Quality (numbered) + Technical Domains / Language and Format (compact, count-sorted inline rows); unique explicit anchors fix the C / C# / C++ → #c-content collisions; 1 resource grammar fixed; non-language values (En, Not Applicable, Polyglot, …) filtered out.
• README mermaid legibility — fixed text overflow in 4 diagrams (long labels wrapped), removed a duplicate edge, and refreshed V2 feature docs (Topic Map, Methodology, last-updated dates, JSON-LD, deterministic artifacts).

Full changelog: https://github.com/nubenetes/awesome-kubernetes/blob/master/CHANGELOG.md

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