Fix dead neptune.ai llm-observability citation links

[julamarkova-vibe]

neptune.ai was acquired by OpenAI in December 2025 and the entire blog now redirects to the acquisition announcement, so the neptune.ai/blog links in this repo no longer lead to the referenced articles.

The FAQ page ai-research-assistant-monitoring.mdx cites Neptune's LLM Observability: Fundamentals, Practices, and Tools six times (with text-fragment anchors). This PR points all six citations to the Wayback Machine snapshot of the original article (last capture before the redirect); the text fragments are preserved.

Greptile Summary

This PR fixes six dead citation links in content/faq/all/ai-research-assistant-monitoring.mdx that previously pointed to a neptune.ai blog article now redirected to an acquisition announcement following OpenAI's December 2025 purchase of neptune.ai.

• All six neptune.ai/blog/llm-observability links are replaced with the same Wayback Machine snapshot (web.archive.org/web/20251005112019/...), preserving the original text-fragment anchors (#:~:text=…).
• The snapshot timestamp (October 5, 2025) predates the acquisition redirect, so the archived content should match the intended citations.

Confidence Score: 5/5

Safe to merge — changes are limited to replacing broken external citation links with archived equivalents and introduce no functional or content changes.

All six links consistently use the same Wayback Machine snapshot from October 2025, which predates the neptune.ai acquisition redirect. Text-fragment anchors are preserved verbatim, so the links should still scroll readers to the originally cited passages. This is a purely mechanical URL substitution in documentation with no risk of regressions.

No files require special attention.

Sequence Diagram

%%{init: {'theme': 'neutral'}}%%
sequenceDiagram
    participant User
    participant OldLink as neptune.ai/blog/llm-observability
    participant Redirect as OpenAI Acquisition Page
    participant WaybackLink as web.archive.org (Oct 2025 snapshot)
    participant Article as Original LLM Observability Article

    Note over User,Redirect: Before this PR (broken)
    User->>OldLink: Click citation link
    OldLink-->>Redirect: HTTP 301 redirect
    Redirect-->>User: Acquisition announcement (wrong content)

    Note over User,Article: After this PR (fixed)
    User->>WaybackLink: Click citation link
    WaybackLink-->>Article: Serve archived snapshot
    Article-->>User: Original article content at text-fragment anchor

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%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
sequenceDiagram
    participant User
    participant OldLink as neptune.ai/blog/llm-observability
    participant Redirect as OpenAI Acquisition Page
    participant WaybackLink as web.archive.org (Oct 2025 snapshot)
    participant Article as Original LLM Observability Article

    Note over User,Redirect: Before this PR (broken)
    User->>OldLink: Click citation link
    OldLink-->>Redirect: HTTP 301 redirect
    Redirect-->>User: Acquisition announcement (wrong content)

    Note over User,Article: After this PR (fixed)
    User->>WaybackLink: Click citation link
    WaybackLink-->>Article: Serve archived snapshot
    Article-->>User: Original article content at text-fragment anchor

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