test(odetovibe/load): cover 6 Load domain test gaps

[scorpevans]

Summary

Covers the 6 Load domain test gaps identified in the gap analysis. Each gap is a separate commit.

• Gap 1 — Prettier applied in merge and strict modes: confirms formatCode runs on both the new-file fallback path and the existing-file merge path for MergeWriter and StrictMergeWriter
• Gap 2 — StrictMergeWriter conflict on import type-only change: adds import-level conflict detection to hasConflict — when codegen changes an import from import type { Foo } to import { Foo } (or vice versa), strict mode now writes to .ode.ts instead of silently leaving both coexisting after merge
• Gap 3 — MergeWriter with generated interface properties: documents the ownership contract — existing interfaces are user-owned; generated properties are silently dropped even when the stub has new fields
• Gap 4 — writeFiles orchestration in merge and strict modes: two orchestration-level tests that exercise the full writeFiles call with "merge" and "strict" context
• Gap 5 — compileErrors field on WriteResult: verifies that the field is populated (and the file NOT written) when generated content contains undeclared names (TS2304)
• Gap 6 — .ode.ts path for multi-dot filenames: confirms .ode is inserted before the last extension (access-building.test.ts → access-building.test.ode.ts, not access-building.ode.test.ts)

Test plan

• pnpm --filter odetovibe test src/load/index.test.ts — 58 tests pass (was 44)
• Gap 2 includes a source change to write-file.ts (hasConflict) — verified by the new test

🤖 Generated with Claude Code

[scorpevans]

Reviewed. Checked: (1) hasConflict import detection logic is correct — matches on specifier + namespace status, returns true only when isTypeOnly differs; (2) compileErrors test reliably produces TS2304 via the isolated fallback project (no tsconfig in tmpdir); (3) multi-dot conflict path test verifies path.extname behavior; (4) interface properties drop test correctly documents the ownership contract; (5) writeFiles merge/strict tests exercise the full orchestration path; (6) all 58 tests pass. Source change in write-file.ts is minimal and well-scoped.