EDS parser tests

Per-crate, no I/O beyond test fixtures, parallel-safe. Live under crates/canopen-eds/tests/.

Test Case: parse() accepts a representative Maxon EPOS4 EDS TEST_0610
status: open
verifies: REQ_0720, REQ_0722, REQ_0726

Loads a canonical Maxon EPOS4 EDS fixture from crates/canopen-eds/tests/fixtures/, calls parse(text), and asserts the resulting EdsFile exposes the expected identity (vendor_id = 0x000000FB), one device, two declared TPDOs and two declared RPDOs, the matching communication parameter records, and a non-empty object dictionary.
Test Case: Parser compiles under no_std + alloc TEST_0611
status: open
verifies: REQ_0721

Compile-only test: a small bin target inside crates/canopen-eds/tests/no_std/ declares #![no_std], parses a fixture EDS string baked in as include_str!. Must compile with --no-default-features against the crate.
Test Case: Parser is independent of codegen and transport TEST_0612
status: open
verifies: REQ_0721

CI shell check: cargo tree -p canopen-eds shall not list canopen-eds-codegen, canopen-eds-rt, taktora-connector-can, socketcan, or ethercrab anywhere in the resolved graph.
Test Case: Unknown sections survive as RawSection TEST_0613
status: open
verifies: REQ_0724

Fixture EDS containing a fabricated [ManufacturerSpecific_FF] section with two keys. After parsing, the IR carries one RawSection entry whose name is exactly the section header and whose keys lists both key/value pairs. The parse does not return an error.
Test Case: Parse errors carry line and column TEST_0614
status: open
verifies: REQ_0723

A deliberately malformed EDS fixture (missing = at a known line / column) parses to Err(EdsError::Syntax { line, column, .. }) with the expected values. Catching this trace in build-time output is the user benefit.
Test Case: Liberal-quirk parsing emits warnings without failing TEST_0615
status: open
verifies: REQ_0725

Fixture EDS carrying every quirk listed in Liberal parsing — warn and ... (REQ_0725): leading UTF-8 BOM, CRLF line endings, trailing whitespace on a value, ; comment after a value, redundant whitespace around =, LineFeed=0 exporter key. The parse returns Ok(EdsFile); EdsFile::warnings lists one entry per triggered quirk with the expected EdsWarning::kind.