Correct strict policy fallback and bounded unary proxy behavior

[hyperpolymath]

Summary

Closes #

Type of change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (would change existing behaviour)
• 🕳️ Soundness fix (fixes a checker/proof false-negative)
• 📖 Documentation
• 🧹 Refactor / tech debt (behaviour-preserving)
• ⚡ Performance
• 🔧 Build / CI / tooling

How has this been verified?

Checklist

• My commits are signed (git commit -S).
• I ran the project's own checks/tests locally and they pass.
• New files carry the correct SPDX-License-Identifier (code/config MPL-2.0,
  prose CC-BY-SA-4.0); I did not relicense existing files.
• Docs are updated, and no public claim now overstates what the code does.
• I have not introduced a soundness hole (or I have flagged where I might have).

Notes for reviewers

[coderabbitai]

Note

Currently processing new changes in this PR. This may take a few minutes, please wait...

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Configuration used: Organization UI

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Plan: Advanced

Run ID: b70f395f-36bd-43fe-b000-705308983c2c

📥 Commits

Reviewing files that changed from the base of the PR and between 19b343c and d9f9693.

📒 Files selected for processing (15)

• .machine_readable/6a2/STATE.a2ml
• lib/http_capability_gateway/application.ex
• lib/http_capability_gateway/logging.ex
• lib/http_capability_gateway/plugins/webhook_hardener.ex
• lib/http_capability_gateway/plugins/xml_rpc_shield.ex
• lib/http_capability_gateway/policy_compiler.ex
• lib/http_capability_gateway/policy_validator.ex
• lib/http_capability_gateway/proxy.ex
• test/e2e_property_test.exs
• test/gateway_test.exs
• test/policy_compiler_test.exs
• test/policy_property_test.exs
• test/policy_validator_test.exs
• test/proxy_wire_test.exs
• test/strict_policy_test.exs

 _____________________________________
< No code too small, no bug too tall. >
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✨ Finishing Touches

📝 Generate docstrings

• Commit to this branch
• Create a new PR

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