0.52.1 · core 2026-07-14

Doc drift cleanup post v0.52.0 — Three doc/test strings mentioned removed legacy fallbacks:
tests/unit/artifact-flow-contract.test.ts: renamed 3 test cases to remove "with index.json fallback" / "legacy fallback" wording (gate, plan-critique, tech-planning now only read from stelow.json).
tests/unit/read-config-helper.test.ts: updated module doc comment.
extensions/stelow/pulse/pulse-task.md: clarified that stelow.json is the canonical source for workflow context (per-workflow index.json is a mirror of one entry in stelow.json#workflows[]).

No functional changes — only doc/test string alignment with v0.52.0 canonical-source contract.
index.json remains as per-workflow mirror file (justified: scoped filesystem layout, easier integration consumer access). Not legacy — updateWorkflowIndexJson() write-through continues.
835 tests passing.