docs: investigate deprecated macOS support and impact on Langflow (LE-265)

[vjgit96]

Summary

Adds a comprehensive investigation document covering the full impact of deprecated macOS Intel (x86_64) support on Langflow — covering Apple hardware EOL, GitHub Actions runner deprecation, PyTorch ecosystem changes, and upstream ML library support gaps.

Fixes LE-265

Context

This is the umbrella investigation for all deprecated macOS support impacts. LE-172 (resolved in PR #12469) addressed the specific PyTorch macOS x86_64 + Python 3.13 CI failure; this ticket covers the broader deprecation landscape and forward-looking roadmap.

Key Findings

1. PyTorch dropped macOS x86_64 wheels after v2.2.2 (March 2024) — already mitigated by platform exclusion markers in PR docs: investigate PyTorch macOS AMD64 + Python 3.13 CI failure (LE-172) #12469 for altk and langchain-huggingface
2. GitHub Actions macos-latest-large (Intel) is the only remaining x86_64 runner and is among the most expensive; macos-13 was removed Dec 2025
3. Apple is expected to drop all Intel Mac support in macOS 27 (2027)
4. Langflow core (flows, API, database, non-ML components) works fine on Intel Macs — only ML/AI features are affected
5. metal_sdk is the getmetal.io cloud SDK (not Apple Metal GPU) — no platform marker needed

Recommendations

#	Action	Target	Priority
—	Exclude torch-dependent extras on macOS x86_64	1.9.x	✅ Done (PR #12469)
R2	Remove Python 3.10 macOS Intel from stable CI	1.10	Low
R3	Document macOS support matrix for users	1.10	Medium
R4	Drop macOS x86_64 from CI entirely	2.0	Medium
R5	Audit OBJC fork safety on Apple Silicon	2.0	Low
R6	Official deprecation notice in release notes	2.0	Medium
R7	Remove x86_64 platform markers (cleanup)	2.x	Low
R8	Evaluate ARM64-only macOS capabilities	2.x	Low

What's Included

• Full deprecation timeline (Apple hardware, macOS versions, GitHub runners, PyTorch, ML ecosystem)
• Complete inventory of all platform markers in pyproject.toml
• Current vs. proposed macOS support matrix
• Risk matrix with probabilities and mitigations
• 8 prioritized recommendations across short/medium/long term

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[github-actions]

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[Adam-Aghili]

I think this is a good plan. I dont think we shoud try and aaddress this for 1.9.0 but please create a JIRA ticket to do this work for 1.10.0