Add CLAUDE.md

[szalpal]

This PR adds CLAUDE.md to the repository

[greptile-apps]

Greptile Summary

This PR adds a CLAUDE.md file to the nvidia/dali_deps repository, providing Claude Code with accurate, repo-specific guidance on what the repository is, how to clone it with shallow submodules, how to build all or individual dependencies, and how patches are managed.

• Content is verified accurate against the actual build_scripts/build_deps.sh and the patches/ directory structure.
• All documented environment variables (HOST_INSTALL_PREFIX, INSTALL_PREFIX, CC_COMP, CXX_COMP, CMAKE_TARGET_ARCH, WITH_FFMPEG, CLEANUP) match the defaults defined in build_deps.sh.
• One minor imprecision: the CLEANUP=1 description says it "runs git clean -fdx on all submodules" but the script also cleans the root repo, re-initialises and re-checks-out submodules — the description could be made more complete.

Confidence Score: 5/5

• Documentation-only PR that is safe to merge; no code changes are introduced.
• The only changed file is a new CLAUDE.md documentation file. Its content has been verified against the actual build scripts and is accurate. The single minor inaccuracy in the CLEANUP=1 description is a documentation improvement, not a blocker. No executable code is modified.
• No files require special attention.

Important Files Changed

Filename	Overview
CLAUDE.md	New documentation file guiding Claude Code in the dali_deps repository; content is accurate against the actual build scripts and directory structure, with one minor imprecision in the CLEANUP description.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Clone repo] --> B[git submodule init]
    B --> C[git submodule update --depth 1 --recursive]
    C --> D{Build target?}
    D -- All deps --> E[Set env vars\nHOST_INSTALL_PREFIX, CC_COMP, etc.]
    E --> F[bash -ex build_scripts/build_deps.sh]
    F --> G[Iterates PACKAGE_LIST\nzlib → protobuf → lmdb → ... → aws-sdk-cpp]
    G --> H[Each build_xxx.sh script\napplies patches/ if needed]
    D -- Single dep --> I[bash -ex build_scripts/build_opencv.sh\nor build_ffmpeg.sh, etc.]
    I --> H
    H --> J[Installed to INSTALL_PREFIX]

    K[CLEANUP=1] -.-> |git clean root + submodules\nreinit + force-checkout| C

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_{Last reviewed commit: 50b8001}

[greptile-apps]

CLEANUP description slightly incomplete

CLEANUP=1 does more than clean submodule working trees. Looking at build_scripts/build_deps.sh, it actually:

1. Runs git clean -fdx on the root repo itself
2. Re-runs git submodule init and git submodule update --init --recursive
3. Runs git submodule foreach 'git clean -fdx' on each submodule
4. Runs git submodule foreach 'git checkout --force'

The current description implies only submodule cleaning, which could mislead a reader into thinking the root working tree is unaffected. Consider:

Suggested change

	- `CLEANUP=1` — runs `git clean -fdx` on all submodules before building
	- `CLEANUP=1` — runs `git clean -fdx` on the root repo and all submodules, re-initialises submodules, and force-checks them out before building