docs: clarify Rust 1.89.0 requirement and add dependency-patch warning

[Digitalenergyllc]

Closes #22
Closes #20

Summary

The NCN README pins Rust 1.89.0 as a prerequisite but doesn't explain why, and the troubleshooting section didn't warn that some workarounds modify dependency source code.

Changes

• Added a note explaining the 1.89.0 requirement (dependency versions pinned by jito-tip-router and the Solana SDK; older toolchains fail to compile), with a rustup override tip to avoid changing the system default
• Added a warning to Troubleshooting that source-level dependency patches are fragile, lost on cargo update, and unsuitable for production (consolidated from docs: add warning about source-level dependency patches in troublesho… #33)

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[greptile-apps]

Greptile Summary

This PR improves the ncn/README.md with two documentation additions: a brief explanation of why Rust 1.89.0 is required (dependency pinning by jito-tip-router and the Solana SDK), and a warning blockquote at the top of the Troubleshooting section flagging that some workarounds involve fragile source modifications to dependency crates.

• Added a prose note after the Rust install commands explaining the 1.89.0 version pin and offering rustup override as an alternative to a global default change.
• Added a ⚠️ Warning blockquote before the Troubleshooting subsections, cautioning readers that dependency-patch workarounds are fragile and unsuitable for production.

Confidence Score: 5/5

Safe to merge — documentation-only change with no functional code modified.

Both additions are accurate, well-scoped prose changes to a README. The Rust version explanation correctly describes the pinned dependency requirement, the rustup override alternative is valid, and the troubleshooting warning accurately characterises the risk of patching dependency source. No logic, configuration, or build files are touched.

No files require special attention.

Important Files Changed

Filename	Overview
ncn/README.md	Documentation-only additions: explanatory note about Rust 1.89.0 version pin and a production-safety warning blockquote in the Troubleshooting section. Both additions are accurate and well-placed.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[User reads ncn/README.md] --> B{Rust 1.89.0 installed?}
    B -- No --> C[rustup toolchain install 1.89.0]
    C --> D{Change global default?}
    D -- Yes --> E[rustup default 1.89.0]
    D -- No --> F[rustup override set 1.89.0\nin repo directory]
    E --> G[cargo build]
    F --> G
    B -- Yes --> G
    G --> H{Dependency conflicts?}
    H -- Yes --> I[⚠️ Warning: workarounds are fragile\nnot for production]
    I --> J[cargo update -p package --precise version\nor other pinning commands]
    J --> G
    H -- No --> K[Build succeeds]

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flowchart TD
    A[User reads ncn/README.md] --> B{Rust 1.89.0 installed?}
    B -- No --> C[rustup toolchain install 1.89.0]
    C --> D{Change global default?}
    D -- Yes --> E[rustup default 1.89.0]
    D -- No --> F[rustup override set 1.89.0\nin repo directory]
    E --> G[cargo build]
    F --> G
    B -- Yes --> G
    G --> H{Dependency conflicts?}
    H -- Yes --> I[⚠️ Warning: workarounds are fragile\nnot for production]
    I --> J[cargo update -p package --precise version\nor other pinning commands]
    J --> G
    H -- No --> K[Build succeeds]

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_{Reviews (2): Last reviewed commit: "Update ncn/README.md" | Re-trigger Greptile}