Serve Microsoft Graph selections from precomputed spec slices

[RhysSullivan]

Production traces show the 43MB Graph monolith fetch completing once in the last 30 days — every other preview/add died mid-download with an empty 503 before any parsing began, so #1751's streaming preview cannot help on its own: the isolate can't reliably hold the download alongside its baseline. This removes the monolith from the request path for every covered selection.

• slice-build.ts (offline-only) builds one filtered spec per catalog preset plus the default bundle from a whole-parse of the source: the selection's path-items via the same microsoftGraphKeepPathItem filter the runtime applies, components pruned to the transitive $ref closure, emitted as the streamable block-YAML profile so the runtime pipeline treats a slice exactly like a source. Sizes: 4.4–13MB per preset (mail 4.9MB), default bundle 18.3MB, vs 42.9MB upstream; ~3.5k schemas is the closure floor because Graph's schema graph is one connected component.
• slices.ts (runtime) maps a selection to an asset — single presets exactly, and any combination within the default bundle to the default slice, which the in-band keepPathItem filter then narrows. Full-graph, custom scopes, and out-of-bundle combinations keep the monolith path, as does any slice fetch failure (fallback preserves prior behavior when assets are missing).
• The graph-slices workflow regenerates and republishes the assets weekly and on dispatch to the graph-slices release tag (non-latest data release; initial assets are published).
• Lint override extended so packages/*/*/scripts/** gets the same process-boundary exemptions as the other script directories.

Verified: mail selection through the real published slice runs adapter fetch + streaming preview in 162ms at 73MB peak under a 100MB heap (monolith path: 825ms at 129MB — over the isolate budget, matching the prod deaths). microsoft-graph-default and microsoft-emulator e2e scenarios pass locally against the live release assets; unit tests cover slice construction, asset resolution, slice-vs-monolith source choice, and fallback.

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Torn down — the PR is closed.

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