docs(examples/minimal): pin real root key, align enforcement mode, and add unit test (fixes #218)

[aipd506]

Fixes #218

Summary of Changes

This PR aligns examples/minimal/README.md with the committed configuration and adds test coverage for the minimal example commands:

1. examples/minimal/README.md Corrections:

   • Replaced <trusted-root-issuer-hex> placeholder on line 14 with the actual pinned trusted root issuer public key (eda38c446da3db3eba68852ca9869260c36badd48b2cab16ec8d8faf607eb162) defined in ca2a-config.yaml.
   • Updated the description of ca2a-config.yaml on line 7 from (software-only, advisory) to (software-only, enforcing) to match the configured enforcement_mode: enforcing.

2. New Unit Test Suite (tests/unit/test_example_minimal.py):

   • Tests ca2a verify-chain against examples/minimal/chain.json with the pinned root key, asserting verified: True, hops: 3, and leaf_scope: ["cap:read"].
   • Tests ca2a validate-config against examples/minimal/ca2a-config.yaml, asserting exit code 0 and output ok: provider=software-only enforcement=enforcing.

Verification

• Offline chain verification passes with the pinned key.
• Config validation output matches the documented string.

[github-actions]

Thanks for this, @aipd506. Closing it for now, and it is not about the change itself.

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