feat: use parser-backed ino prototype generation

[zackees]

Summary

• Replace regex-based .ino prototype extraction with tree-sitter C++ parsing.
• Generate prototypes only from free-function definitions and skip control-flow blocks, lambdas, class methods, macro fragments, namespace-local functions, and scoped Class::method definitions.
• Strip default argument expressions from generated prototypes so the later function definition remains valid C++.
• Document that this path uses an embedded parser and does not require clang/libclang at runtime.

Closes #648

Tests

• soldr cargo fmt
• soldr cargo test -p fbuild-build source_scanner
• soldr cargo clippy -p fbuild-build --all-targets -- -D warnings
• soldr cargo test -p fbuild-build

Notes

During verification, one soldr run reported a lost zccache daemon connection during session start. I ran the standard daemon stop/retry flow and the same test passed afterward.

Summary by CodeRabbit

• New Features

  • Enhanced .ino prototype extraction with improved handling of templates, references, and complex C++ signatures for better accuracy.

• Documentation

  • Added reference documentation describing the .ino prototype generation process and supported language constructs.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: c140c245-36f6-4143-b81e-af92f51c5710

📥 Commits

Reviewing files that changed from the base of the PR and between db10481 and 3b7b02c.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (4)

• Cargo.toml
• crates/fbuild-build/Cargo.toml
• crates/fbuild-build/src/source_scanner.rs
• docs/reference/platformio-compatibility.md

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📝 Walkthrough

Walkthrough

Replaces regex-based .ino function prototype and forward-declaration extraction in source_scanner.rs with a Tree-sitter C++ parser pipeline. Adds tree-sitter and tree-sitter-cpp as workspace and crate dependencies, updates prototype-extraction tests for complex C++ signatures, and adds reference documentation describing the new approach.

Changes

Tree-sitter .ino Prototype Extraction

Layer / File(s)	Summary
Workspace and crate dependency wiring Cargo.toml, crates/fbuild-build/Cargo.toml, crates/fbuild-build/src/source_scanner.rs	Registers tree-sitter (0.26.9) and tree-sitter-cpp (0.23.4) as workspace dependencies, adds them to the crate's dependency section, and imports tree_sitter::{Node, Parser} in the scanner.
Tree-sitter prototype extraction and forward-declaration detection crates/fbuild-build/src/source_scanner.rs	Replaces regex-based extract_function_prototypes and find_existing_forward_declarations with a Tree-sitter C++ parser pipeline that traverses function_definition and declaration AST nodes, skips nested namespace/class/struct/union contexts, normalizes signatures, strips default argument values via AST byte ranges, and deduplicates results.
Updated tests and reference documentation crates/fbuild-build/src/source_scanner.rs, docs/reference/platformio-compatibility.md	Adds test cases for templates, attributes, references, and default-argument stripping; adds cases asserting non-free functions are skipped; removes the prior regex keyword-skip test. Adds a documentation subsection covering the Tree-sitter-based prototype generation approach, its structural constraints, and the absence of a clang/libclang runtime requirement.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐇 Hopping through syntax trees with glee,
No more regex for this little bunny!
Tree-sitter parses C++ just right,
Templates and defaults all trimmed tight.
Forward declarations, clean and bright —
The AST keeps prototypes in sight! 🌿

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/648-parser-backed-ino-prototypes

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