docs(#54): F-4 legacy annotation + F-5 fixture convention -- AUDIT-01 housekeeping

INTEGRATION-AUDIT-01 (#50) §10.4 / §10.5 housekeeping carry-over.

F-4: annotate 14 remaining legacy Phase R'/Q sample-text hits across 10
src/ files with inline marker `# [legacy Phase R'/Q example -- INTEGRATION-AUDIT-01 §10.4]`.
Comment-only. No string-literal / regex / sample dict value mutated.
fit_verifier.py L612 marker keeps Phase Z partial-live import graph
(FitAnalysis / RoleFit / redistribute / salvage) byte-precise.

F-5: docs-only addendum -- §10.5.1 in INTEGRATION-AUDIT-01-REPORT.md +
tests/CLAUDE.md fixture convention note. No root tests/fixtures/ dir
created; existing tests/phase_z2/fixtures/ convention preserved. Documents
test-only sample-reference allowance vs src/** runtime prohibition.

Out of scope: Phase Z source 11 hits (phase_z2_content_extractor /
failure_router / mapper / retry), production behavior change, #19 work.

Verified: pytest -q tests/phase_z2/ = 157 PASS. git diff +210/-0
(35 src/docs lines + 175 new tests/CLAUDE.md). No behavioral delta.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/design_director.py

@@ -29,6 +29,7 @@ BLOCK_SLOTS = {
         "slot_desc": {
             "title_ko": "한글 메인 타이틀",
             "title_en": "영문 서브 타이틀 (없으면 생략)",
+            # [legacy Phase R'/Q example — INTEGRATION-AUDIT-01 §10.4]
             "breadcrumb": "상위 카테고리 경로 (예: 디지털전환 > BIM)",
             "bg_image": "배경 이미지 경로",
         },
@@ -965,6 +966,7 @@ def _validate_height_budget(blocks: list[dict], preset: dict) -> list[dict]:
     for block in blocks_to_remove:
         blocks.remove(block)
 
+    # [legacy Phase R'/Q example — INTEGRATION-AUDIT-01 §10.4]
     # 삭제 후 zone_blocks 재구성 (후속 pill-pair/높이 체크에 반영)
     zone_blocks.clear()
     for block in blocks: