Relux:test Edit

Original name

Original description

Modify an existing `test` declaration -- changing its body (sends, matches, captures, fail patterns, sleeps), markers, `start` deps, `let` bindings, docstring, name, cleanup -- or relocate it under `relux/tests/<sut>/<scope>/`, or split a fat test by hard-switching to `relux:test-write` for a new sibling and stripping the now-covered slice from the original. Use when the user asks to retune a match, anchor an unanchored pattern, tighten or loosen an assertion, add or drop a `start <Effect>`, change the test's isolation values, fix a captures-lost-to-clobber bug, add or remove a marker, rename the test, move it to a different SUT/scope, update its docstring, or split one fat test into two siblings. Fires on phrasings like "fix the match in `<test>`", "anchor this regex", "add a fail pattern", "the test name no longer matches the body", "move this test under `<sut>/<scope>/`", "this test does too much -- split it", "swap `start <OldEffect>` for `<NewEffect>`". Diagnosing a failing test is future `test-debug`; flake triage is future `test-flakiness`; authoring a brand-new test is `relux:test-write`; changing an effect's surface is `relux:effect-edit`; helper authoring is `relux:function`. Hard-switch protocol -- if the edit needs an effect that does not yet exist, switch to `relux:effect-write`; if the edit needs a broken effect fixed first, switch to `relux:effect-edit`; if the edit is a split-by-extraction, switch to `relux:test-write` for the new sibling and return here to strip.