refactor(agent-runtime): extract core contracts into corvus-traits

[yacosta738]

Summary

• introduce the corvus-traits workspace crate for low-risk runtime contracts
• extract security, channel, and memory traits into the new crate while preserving legacy import paths with compatibility shims
• add API compatibility coverage to prove old and new trait paths resolve to the same trait identities

Validation

• cargo test --manifest-path clients/agent-runtime/Cargo.toml -p corvus-traits
• cargo test --manifest-path clients/agent-runtime/Cargo.toml --test traits_api_compat
• cargo test --manifest-path clients/agent-runtime/Cargo.toml --test memory_backend_selection

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✅ Contributor Report

User: @yacosta738
Status: Passed (12/13 metrics passed)

Metric	Description	Value	Threshold	Status
PR Merge Rate	PRs merged vs closed	90%	>= 30%	✅
Repo Quality	Repos with ≥100 stars	0	>= 0	✅
Positive Reactions	Positive reactions received	10	>= 1	✅
Negative Reactions	Negative reactions received	0	<= 5	✅
Account Age	GitHub account age	3087 days	>= 30 days	✅
Activity Consistency	Regular activity over time	108%	>= 0%	✅
Issue Engagement	Issues with community engagement	0	>= 0	✅
Code Reviews	Code reviews given to others	540	>= 0	✅
Merger Diversity	Unique maintainers who merged PRs	2	>= 0	✅
Repo History Merge Rate	Merge rate in this repo	91%	>= 0%	✅
Repo History Min PRs	Previous PRs in this repo	224	>= 0	✅
Profile Completeness	Profile richness (bio, followers)	90	>= 0	✅
Suspicious Patterns	Spam-like activity detection	1	N/A	❌

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_{Contributor Report evaluates based on public GitHub activity. Analysis period: 2025-04-10 to 2026-04-10}