59 lines
4.2 KiB
Markdown
59 lines
4.2 KiB
Markdown
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# Feature release lifecycle experiment — 2026-09-26
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Status: executed synthetic browser mechanism, editorial interpretation by Codex.
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WP-0003 T01, following [source/deployment contrast](FeatureDeploymentBoundaries.md).
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The [fixture and receipt](../experiments/feature-release/README.md) record seven cases
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in two browsers, 14/14 expected observations. Seventeen hypotheses remain unchanged
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in maturity; no production deployment, operational team independence or recurrence
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is established. No model calls were needed.
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## Evidence and provenance
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SRC-0036 is our native-module host and versioned feature fixtures, executed with
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Playwright 1.63.0, Chromium 151.0.7922.34 and Firefox 155.0. Source/lock hashes are in
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the result receipt; browser hashes and package integrity are in provenance.json.
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Every response uses no-store, and the loopback server serves no external resources.
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SRC-0037: [MDN import()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/import#module_namespace_object),
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Module namespace object, accessed 2026-09-26, living revision unknown. Its description
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of reuse after successful module loading provides context for distinguishing module
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identity from HTTP caching. We do not generalize our document-map snapshot policy to
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all loaders or dynamic import-map update strategies.
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## Observations, not deployment guarantees
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| Evidence | Result | Pattern implication |
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| --- | --- | --- |
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| X01 | Publishing R2 alone leaves new pages on R1 | Artifact availability and activation are separate |
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| X02 | Fresh page loads R2; old loaded/lazy pages load or retain R1; A1 unchanged | Compatible feature activation can coexist with an unchanged host and neighbor in this fixture; old-session binding matters even before first feature use |
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| X03 | R3 is evaluated but mounting is rejected for host API mismatch; A1 works | Post-import contract checks can prevent incompatible mounting, but cannot undo module side effects or provide security isolation |
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| X04 | Missing Reports module yields local error while Account navigation works | Host-level load handling is distinct from a component rendering boundary |
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| X05 | Binding rollback changes a fresh page to R1 while an open page remains R2; reload selects R1 | Rollback needs a declared session scope; binding update alone is not hot replacement |
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| X06 | Removing R1 breaks the old lazy session but not one that already loaded it | Artifact retention must account for delayed first loads from supported older documents |
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| X07 | Shared startup import failure keeps both actions disabled, before any feature load | Separate artifacts do not eliminate dependencies on startup-critical shared resources |
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X03, X04, X06 and X07 include deliberately observed failures. A “pass” means the
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asserted behavior occurred, not that the experience is acceptable. The version gate
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is our fixture code, not a universal browser, single-spa or federation guarantee.
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The R3 declaration is intentionally simple; real API compatibility is not reducible
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to equality of one number. Test outcomes do not prove compatibility with arbitrary
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host/backend versions or that deployment changes are applied atomically.
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## Candidate and walkthrough correction
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[Independent Feature Boundary](../candidates/IndependentFeatureBoundary.md) should
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name three lifetimes separately: retained artifact, binding chosen for a session,
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and module instance already evaluated in that session. Retiring an artifact based
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only on the current global binding can invalidate an older page's later load.
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[VC-06](../walkthroughs/VC06-MicrofrontendEstate.md) now has executable support for
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its load/activation/rollback distinction in this small model. Its accessibility,
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real-system compatibility, authoritative writes and independent assessment remain
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open. The earlier pinned examples were not run; their source observations remain
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separate. Keep the pattern a hypothesis and the walkthrough provisional.
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Next under WP-0003 T01: declare an old-session support/retention policy, then test
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activation-map concurrency and safe reload with unfinished work before making a
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production recommendation. Navigation/history/cache evidence remains pending. Avoid
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turning this model into a release platform merely to close the research question.
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