Add edit-artifact: patch-based artifact updates

[RhysSullivan]

Every artifact edit currently re-emits the entire component source, so the model's output — and the user's wait — scales with component size rather than edit size. This adds an edit-artifact tool: exact find-and-replace patches against the stored source, applied in order, all-or-nothing.

• applyArtifactEdits (pure, in create-artifact.ts): unique-match enforcement with a replaceAll opt-out, ordered application, and rejection messages the model can retry from.
• The edited result runs the same validate → smoke-render → bind → save pipeline as a create, so an edit cannot save anything a create would refuse. A failed batch changes nothing and returns the current source in structuredContent.code, so the retry needs no show-artifact round trip.
• create-artifact's description, the artifactId param text, and the create-artifact skill now route tweaks to edit-artifact and reserve full re-send for rewrites.

Tests: 9 new tool-level cases (sequencing, replaceAll, ambiguity, atomicity, validation/smoke-render of the edited result, probe-proof foreign ids, binding re-resolution, title/description updates); visibility assertions and the e2e opt-out enumeration updated. Format, lint, typecheck, mcp + execution suites, and the artifacts selfhost e2e scenario all pass.

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