[M2-DEC-01] Confirm 2:1 dimetric as template default (D-ISO) - #53
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ADR 0005 (docs/decisions/0005-iso-default.md): confirms 2:1 dimetric as the default isometric projection for new projects and templates, with true 30/60 iso and custom shear remaining selectable per scene (FR-2.5, AC-4.4). Closes PRD §18 item 8 / roadmap D-ISO, unblocking M2-CAM-02. Docs only, no code: - ADR 0005 written (context, decision, alternatives, evidence, consequences, review conditions per DOC-005) - ADR indexed in docs/decisions/README.md and docs/README.md - M2-DEC-01 box checked in roadmap/M2-rendering-2.5d.md - Decision register D-ISO row, Progress Board (M2 1/33, total 48) updated in roadmap/README.md
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Closes roadmap step M2-DEC-01 (decision D-ISO, PRD §18 item 8): confirms 2:1 dimetric as the default isometric projection for new projects and templates. True 30°/60° iso and custom shear remain selectable per scene (FR-2.5, AC-4.4). Docs only, no code:
docs/decisions/0005-iso-default.md— context, decision, alternatives considered, evidence, consequences, review conditions (DOC-005)docs/decisions/README.md(table) anddocs/README.md(ADR list)roadmap/M2-rendering-2.5d.md— M2-DEC-01 box checkedroadmap/README.md— decision register D-ISO row closed, Progress Board M2 1/33 (total 48/194), Change Log line (second commit, referencing the step's commit per the retroactive-line pattern)Verify (step's Verify clause: "ADR exists"): ADR 0005 exists in this PR. No code changes — no tests/builds to run; all internal links verified against the tree. The decision is presentation-only (ARCH-009): no sim/determinism/replication impact, and it unblocks M2-CAM-02 (the only M2 step depending on M2-DEC-01).