Docs/add no std usage examples

[anidroid1184]

Contribution Checklist

• ⭐ I have starred the repository
• 🔀 I have forked the repository and created a new branch for my changes
• 📖 I have read the CONTRIBUTING.md guide

Description

Add no_std usage example to docs/

Related Issue

Closes #24

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 📝 Documentation update
• 🔧 Refactor (code change that neither fixes a bug nor adds a feature)
• ⚡ Performance improvement
• ✅ Test addition or update
• 🏗️ CI/CD or build system change

Checklist

• I have added or updated tests that prove my fix is effective or my feature works
• cargo clippy --all-targets -- -D warnings passes with no warnings
• cargo fmt --check passes with no formatting issues
• cargo test --all-targets passes
• cargo test --doc passes
• I have updated documentation as needed (rustdoc, README, etc.)
• I have updated the changelog (if applicable)
• My changes do not introduce any new unsafe code (or it is properly justified and documented)

Additional Notes

Summary by CodeRabbit

• Documentation
  • Added guidance for using the library in no_std + alloc environments.
  • Documented configuration requirements, supported APIs, limitations, examples, and build verification steps.
  • Added links to architecture documentation covering no_std usage and WASM support.

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: e6222b81-aba8-420c-ac4e-16d9362746c9

📥 Commits

Reviewing files that changed from the base of the PR and between 931ca17 and a4212fd.

📒 Files selected for processing (1)

• docs/architecture/no_std_usage.md

📝 Walkthrough

Walkthrough

Adds a no_std + alloc usage guide covering configuration, examples, API availability, limitations, and verification commands. The README now links to the no_std and WASM architecture documentation.

Changes

no_std Documentation

Layer / File(s)	Summary
no_std setup and parsing example docs/no_std_usage.md	Documents feature configuration, allocator and panic-handler requirements, plus parsing, attribute access, and serialization examples.
API availability and limitations docs/no_std_usage.md	Lists supported capabilities, contrasts std-only APIs, and records known no_std limitations.
Verification guidance and documentation links docs/no_std_usage.md, README.md	Adds native, WASM, and embedded verification commands and links the no_std and WASM documentation from the README.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested labels: enhancement

Suggested reviewers: ateebnoone

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly reflects the docs-focused no_std usage update and README link changes.
Linked Issues check	✅ Passed	The docs cover Cargo.toml flags, a minimal no_std example, limitations, README linking, and verification steps.
Out of Scope Changes check	✅ Passed	The changes stay within documentation updates for no_std support and add no unrelated code.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@README.md`:
- Around line 154-157: Update README.md lines 154-157 to link to
docs/no_std_usage.md, and update docs/no_std_usage.md lines 10-13 to reference
architecture/wasm.md; keep both documents under their current docs locations and
ensure all documentation paths resolve consistently.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 9627ab75-3c56-4989-94f3-b2f551eed3a8

📥 Commits

Reviewing files that changed from the base of the PR and between 3b834cb and 931ca17.

📒 Files selected for processing (2)

• README.md
• docs/no_std_usage.md