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Changes extracted from #85. Should not affect logic. Review should be very easy.

[greptile-apps]

Greptile Summary

This PR adds clarifying comments to two header files without altering any logic — exactly as described. The changes improve developer understanding of the DateTime bitfield layout and the qpf_grow_fn_t callback signature.

Key changes:

• datatypes.h: Each DateTime.Part member now documents its encoding scheme (0-based, 1900-based), and the Value field notes it is not a Unix epoch timestamp. All comments are consistent with actual usage across the codebase (e.g., Year+1900 in htdrv_datetime.c, tm_mon assigned directly to Month, tm_mday - 1 assigned to Day).
• qprintf.h: Named parameters are added to the qpf_grow_fn_t function-pointer typedef (str, size, offset, args, req), along with a Javadoc-style block comment. The descriptions match the semantics used in every concrete implementation of this callback (htr_internal_GrowFn, qpfPrintf_grow, etc.).

Confidence Score: 5/5

• This PR is safe to merge — it contains only comment additions with no logic changes.
• All new comments were verified against actual usage sites in the codebase and are accurate. No executable code was modified.
• No files require special attention.

Important Files Changed

Filename	Overview
centrallix-lib/include/datatypes.h	Adds inline comments to all DateTime bitfield members and the Value field; comments are accurate per codebase evidence (Year is 1900-based, Month/Day/Hour/Minute/Second are 0-based, Value is not a Unix timestamp).
centrallix-lib/include/qprintf.h	Adds named parameters to the qpf_grow_fn_t function-pointer typedef and a Javadoc-style comment block; parameter names and descriptions match actual implementations (e.g., htr_internal_GrowFn, qpfPrintf_grow).

Sequence Diagram

sequenceDiagram
    participant Caller
    participant qpfPrintf_va_internal
    participant qpf_grow_fn_t

    Caller->>qpfPrintf_va_internal: qpfPrintf_va_internal(s, &str, &size, grow_fn, grow_arg, format, ap)
    loop For each format specifier
        qpfPrintf_va_internal->>qpfPrintf_va_internal: Check if buffer is large enough
        alt Buffer too small
            qpfPrintf_va_internal->>qpf_grow_fn_t: grow_fn(&str, &size, offset, args, req)
            qpf_grow_fn_t-->>qpfPrintf_va_internal: 1 (success) / 0 (failure)
        end
        qpfPrintf_va_internal->>qpfPrintf_va_internal: Write formatted output to str
    end
    qpfPrintf_va_internal-->>Caller: bytes written (or -1 on error)

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_{Last reviewed commit: f19429f}

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@greptileai Please re-review this PR and let me know if you have any other comments, or let me know if the PR is ready to merge.

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PR cleared for human review.