REQ-53-00-00-SRS-001: Expand ATA 53 NAMING_CONVENTIONS.md to normative status

[Copilot]

ATA 53 (Fuselage) NAMING_CONVENTIONS.md was a 40-line scaffold placeholder. Expanded to a normative specification following the established ATA-28 reference pattern.

Additions

• ID Grammar — KNOT identifiers (section/subject-level), KNU identifiers with type codes (REQ, DES, ANA, TST, SAF, CRT, PUB), S1000D-compliant DMC format
• Folder Naming — Section folders 53-00 through 53-90, subject folder slug patterns
• Controlled Vocabulary — 8 fuselage structural terms (Skin Panel, Frame, Stringer, Bulkhead, Longeron, Keel Beam, Splice, Doubler)
• Unit Standards — mm, N, MPa, kg, °C, bar
• File Naming — YAML/CSV and document file patterns (<DOCTYPE>-ATA53-<SS>-<SU>-<NNN>.md)
• Revision History — Tracks scaffold → normative progression

Example ID grammar:

KNU-ATA53-<YY>-<ZZ>-<KNOT_NNN>-<TYPE>-<NNN>
DMC-AMPEL360-53-<SS>-<SU>-<SB>-<SX>-<AAA>-<NNN>-<V>

Original prompt

On NAMING_CONVENTIONS.md, REQ-53-00-00-SRS-001 — System Requirement Specification

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