feat(bundles): create lfx-bundles metapackage skeleton

[erichare]

Bundle Separation Phase A — PR 2: lfx-bundles skeleton

Part of Bundle Separation Phase A — metapackage split (1.11). Stacked on the foundation PR (bundles/foundation-discovery).

What this does

Creates the manifest-less lfx-bundles distribution that the long-tail providers will move into. Empty skeleton for now — the bulk move (scripts/migrate/consolidate_bundles.py, a later PR) populates the provider folders + per-provider extras.

• src/bundles/lfx-bundles/: a single pyproject.toml declaring the lfx.bundles entry-point (lfx_bundles = "lfx_bundles"), an lfx>=1.10.0,<2.0.0 pin, and a generated (currently empty) all extra; a bare lfx_bundles/__init__.py namespace package; and a README documenting the model + install stories.
• Wired into the root workspace via the existing bundle marker blocks: dep lfx-bundles[all]>=1.0,<2.0, uv source, member.
• Hyphen dir name (lfx-bundles) so release.yml's src/bundles/*/pyproject.toml glob builds it with zero workflow change.

Test plan

• uv sync resolves + installs lfx-bundles==1.0.0
• Wheel builds; entry_points.txt carries the lfx.bundles group
• load_lfx_bundles_extensions() (foundation PR) discovers the entry point and the empty skeleton registers zero providers with no error

Stack (merge bottom-up)

1. bundles/foundation-discovery → feat/bundle-metapackage-split (foundation)
2. bundles/create-lfx-bundles → bundles/foundation-discovery ← this PR
3. bundles/lfx-engine-only → bundles/create-lfx-bundles (engine-only)

Base is the foundation branch so this PR's diff is only the skeleton. GitHub auto-retargets to feat/bundle-metapackage-split once PR 1 merges.

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