[GATE-P0-5] Add WAVE-C offline Ayane substrate

[sorted-ai-bot]

Summary

• Add WAVE-C C1 offline Ayane substrate: manifest types, cache/download fixture acquisition, SHA-256 verification, offline mode state, and llama.cpp adapter state handling.
• Add three non-hollow test targets for Ayane download/cache, offline mode transitions, and llama.cpp adapter states.
• Register the new test targets in xmake and CI.

Verification

• xmake build -y PASS
• traveler --version => Traveler. v0.1.0-alpha
• xmake test -v PASS: 18/18 targets, 829 assertions
• bash scripts/license_audit.sh PASS

Scope Note

This is current-resource substrate evidence. It does not claim real model download, real GGUF inference, Core-i3 first-token latency, or GATE-P0-5 PASS. Production Ayane URLs/SHA values remain intentionally incomplete until official values are provided.

[sorted-ai-bot]

@YumaKakuya PR #16 merge request

[github-actions]

PR Auto-Review

AI inference did not produce a response (outcome=failure).
This does not block merge; human review remains authoritative.

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• Model: openai/gpt-4o-mini via actions/ai-inference@v2
• Diff: 94567 bytes (truncated=true)
• Run: https://github.com/YumaKakuya/traveler/actions/runs/25479583132

AI-generated sanity check. CEO remains final merge authority.