Add documentation trust page with verification signals

[TDamiao]

Goal

Create a concise trust page in docs describing verification and release integrity signals.

Why

Users evaluating a TA library for production need one place to understand reliability posture quickly.

Scope

• Add docs/trust.md (or similar) linked from README.
• Cover compatibility policy, release gates, CI checks, and versioning guarantees.
• Include where to find changelog, tags, release notes, and benchmark/compat reports.

Implementation prompt

Write a single page that answers:

1. Why results are trustworthy
2. What is validated before release
3. How users can independently verify versions and behavior
4. What limitations remain

Acceptance criteria

• Trust page exists and is linked from README.
• Content references real repo artifacts (CI workflow, release tags, changelog, compat policy).
• Language is factual and auditable (no marketing claims without evidence).

Test plan

• Link checker for all references.
• Manual review: can a new user verify trust signals in < 5 minutes.