Add readonly models for collection concepts

[konard]

Summary

Resolves #78 by adding const-only models for the mutable collection concepts:

• CReadonlyDictionary and ReadonlyDictionary
• CReadonlyList and ReadonlyList
• CReadonlySet and ReadonlySet

The readonly concepts evaluate their operations through const references, so a collection can expose iteration, lookup, indexing, size, and emptiness without implementing mutation.

Additional fixes

• Fixed the explicit-item readonly-list form so CReadonlyList<const T, Item> accepts a const item reference.
• Fixed dependent type qualification in Dictionary and ReadonlyDictionary, allowing their Key and Value aliases to instantiate.
• Replaced the unintegrated example and committed executable with compile-time regression coverage in the C++ test target.
• Removed the source of all seven reported Codacy findings (four unresolved standard includes and three unused variables).
• Updated the C++ package version from 0.3.42 to 0.3.43.

Reproduction and regression coverage

The regression types expose only const collection operations. Compile-time assertions verify:

• readonly list, set, and dictionary concepts accept const-qualified models;
• every supported zero-, one-, and two-argument concept form;
• mutable concepts reject the const-only models;
• readonly trait models instantiate and expose the expected item/key/value types.

Before the fix, the explicit-item list assertion failed and the readonly dictionary trait aliases did not instantiate.

Verification

• CI-equivalent Conan/CMake C++ build
• C++ test executable: 8/8 passed
• Strict GCC C++20 compile of the regression target
• Cppcheck pass over all changed C++ sources with no new findings
• Repository Node policy tests: 30/30 passed
• git diff --check

Resolves #78

[konard]

We need to get all Codacy issues resolved, see screeshots:

[konard]

🤖 AI Work Session Started

Starting automated work session at 2026-09-21T09:50:14.848Z

The PR has been converted to draft mode while work is in progress.

This comment marks the beginning of an AI work session. Please wait for the session to finish, and provide your feedback.

Runtime: solve v2.29.0 · tool codex · model gpt-5.6-sol · task image konard/hive-mind-dind:2.29.0@sha256:11a236d03854cbaea86fdd7ca06265c912cf0b67d1fcc9b3eb60bd84c43ff749

[konard]

Working session summary

Implemented, pushed, and marked ready for review: PR #130.

Key results:

• Added readonly dictionary, list, and set concepts/models.
• Added compile-time regression coverage for const-only collections.
• Fixed explicit-item list validation and dictionary trait instantiation.
• Removed the example and binary responsible for all seven Codacy findings.
• Bumped C++ package version to 0.3.43.
• Merged current main; working tree is clean.
• Fresh C++ CI, Codacy, and both CodeQL checks all pass.
• Local C++ tests: 8/8 passed; Node policy tests: 30/30 passed.

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This summary was automatically extracted from the AI working session output.

[konard]

🤖 Solution Draft Log

This log file contains the complete execution trace of the AI solution draft process.

💰 Cost estimation:

• Model: GPT-5.6 Sol
• Provider: OpenAI
• Public pricing estimate: $7.893810

📊 Context and tokens usage:

• 140.9K / 200K (70%) input tokens, 33.6K / 128K (26%) output tokens

Total: (140.9K + 7.2M cached) input tokens, 33.6K output tokens, $7.893810 cost

🤖 Models used:

• Tool: OpenAI Codex
• Requested: gpt-5.6-sol
• Thinking level: xhigh (~31999 tokens)
• Model: GPT-5.6 Sol (gpt-5.6-sol)

📎 Log file uploaded as Gist (2486KB)

• View complete solution draft log

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Now working session is ended, feel free to review and add any feedback on the solution draft.

[konard]

✅ Ready to merge

This pull request is now ready to be merged:

• All CI checks have passed
• No merge conflicts
• No pending changes

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