release: 0.49.0 — R2 guardrails & test net
Internal-only epic (gates, tests, compiler strictness); no user-facing change, so the release note is chores-only. Bundles: the siftlode check/publish gate (tsc/eslint/prettier/knip/vitest/pytest) with a hard pre-publish gate + e2e freshness guard, ESLint flat config + one-time Prettier pass, the backend pytest harness (isolated test image), frontend vitest growth, the e2e scroll-restore fix, and noUncheckedIndexedAccess (+ the zero-fallout compiler flags).
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