Prepare FlashcardKit 0.1.0

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Summary

• finalize the initial implementation changelog as 0.1.0
• document Swift Package Manager adoption from version 0.1.0
• retain the current implementation-accurate README and DocC API examples

Validation

• AgentGuidelines/Scripts/swift_format.sh format-and-lint Package.swift Sources Tests
• swift test (21 tests passed)
• local static-hosting DocC generation for FlashcardKit
• AgentGuidelines/Scripts/validate_consumer_setup.swift
• Markdown wrapping audit for README, changelog, and DocC catalog
• AgentGuidelines 0.0.32 exact tagged-tree provenance
• .gitignore shared-pattern audit and git diff --check

Release plan

After this PR is approved, merged, and its exact-head CI is green, create GitHub release 0.1.0 from the merge commit. The existing release workflow will retest the package, generate DocC, and deploy GitHub Pages.

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Reasoning Relay exact-head review: APPROVED

• Base: 2d5722b2f88e25bc4950835953fbd9492192ce1c
• Head: 950984f254e994f0df49fe534471a5b687e283fa
• P0/P1 findings: none
• P2/P3 observations: none
• Merge/release verdict: exact head is OK to merge and release as 0.1.0 after creating the tag from the merged release commit
• Delegation: del_b815fb6e-1420-484c-b6e4-961638648095
• Response hash: 0ec2b3f61508032efc4a9506d4d8023bfe0aab2229ad7706387caa24ff4111f9