[Docs] Deprecation policy, SDK tier target, and CONTRIBUTING.md - #472

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chr-hertel wants to merge 8 commits into

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chr-hertel:docs/lifecycle-tier-and-contributing

Commits on Aug 22, 2026

[Docs] Add deprecation policy doc (SEP-2596)
chr-hertel
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11fb039
[Docs] Add SDK Tier 2 gap analysis (SEP-1730)
chr-hertel
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961647d
[Docs] Wire deprecation policy and SDK tier docs into the guide nav
chr-hertel
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febe648
[Docs] Add CONTRIBUTING.md
chr-hertel
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d726b4d
[Docs] Trim deprecation policy per review
chr-hertel
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3ed2b5e
[Docs] Cite the Tier 3 audit and add a versioning policy (SEP-1730)
chr-hertel
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86adfb2
[Docs] Link Symfony's BC promise from the deprecation policy
chr-hertel
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592d73b
[Docs] Drop the "process gaps addressed" aside from sdk-tier.md
chr-hertel
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94600e0