Overhaul renderer implementation in v4

[tristanpoland]

This pull request refactors the workspace and example projects to use a new helio-core and helio-default-graphs structure, and updates all example applications to use a unified render graph construction flow. It also simplifies the workspace configuration and cleans up deprecated code.

Workspace and crate structure:

• The workspace member list in Cargo.toml is replaced with a glob pattern (crates/*), simplifying crate management and making it easier to add or remove crates. ([Cargo.tomlL3-R3](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-2e9d962a08321605940b5a657135052fbcef87b5e360662bb527c96d9a615542L3-R3))
• All references to helio-v3 are replaced with helio-core, and helio-default-graphs is introduced as a new dependency for constructing render graphs. ([[1]](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-2e9d962a08321605940b5a657135052fbcef87b5e360662bb527c96d9a615542L77-R30), [[2]](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5L140-R166))

Examples and render graph initialization:

• All example applications are updated to use the new build_default_graph function from helio_default_graphs, and to explicitly create and pass Scene, DebugDrawState, debug camera and cull stats buffers, and the render graph to the Renderer::new constructor. This unifies and modernizes renderer initialization. ([[1]](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-5f8095f8015965bf93b4f7e7d9df8a0521c8e9bcab21332e75f26915020a52c5L14-R15), [[2]](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-5f8095f8015965bf93b4f7e7d9df8a0521c8e9bcab21332e75f26915020a52c5L126-R147), [[3]](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-385674391bd4311c94696d33dc7c51dd93efe707df118e2dbe5d7b654fc25f77L22-R25), [[4]](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-385674391bd4311c94696d33dc7c51dd93efe707df118e2dbe5d7b654fc25f77L233-R253), [[5]](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-1cb7b9f07b7c816a48ffcb919811b2e527c5623047bf6a86dcb2bce7c92d6884L14-R15), [[6]](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-1cb7b9f07b7c816a48ffcb919811b2e527c5623047bf6a86dcb2bce7c92d6884R116-R135), [[7]](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-21c8f2a4d3da1b124b726b3072ae8232599048cfd96bbf63e4e505bef7a3b204L30-R33), [[8]](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-21c8f2a4d3da1b124b726b3072ae8232599048cfd96bbf63e4e505bef7a3b204R162-R181), [[9]](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-efc4fd2d9c701b506dc2ab01e26866e25c0c714d5174704b35b4145306dfcc29L30-R34), [[10]](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-efc4fd2d9c701b506dc2ab01e26866e25c0c714d5174704b35b4145306dfcc29R161-R181), [[11]](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-f97cb9ff1168f29751df779023721531e4934ed50721f122ff4a2cce5bce4cdfL26-R28), [[12]](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-f97cb9ff1168f29751df779023721531e4934ed50721f122ff4a2cce5bce4cdfR219-R239), [[13]](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-7de04b043674761f48a225b5ea711d93da270b4a91741047de0875d68e46a903L23-R27))
• The README.md and crate documentation are updated to reflect the new API and crate names, ensuring that users see up-to-date usage examples and crate structure. ([[1]](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5L72-R106), [[2]](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5L140-R166))

Cleanup:

• Removes the deprecated enable_live_dashboard helper from demo_portal.rs, as the live performance dashboard feature has been removed. ([crates/examples/demo_portal.rsL1-L4](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-acc25f6b195b611c94e6793e969613fdce00a08349993861ddde9d98c3aa73e5L1-L4))

Dependency updates:

• Updates dependencies in examples to use the new helio-default-graphs crate where appropriate. ([crates/examples/Cargo.tomlR164](https://github.com/Far-Beyond-Pulsar/Helio/pull/50/files#diff-04d80c541556b06d72062686dc56a02b82e82be07ea2805106a63412b58ba14fR164))

These changes modernize the project structure, simplify example initialization, and prepare the codebase for further development with the new render graph and core crate architecture.