Remove exception support from slicec

[externl]

• Remove Exception type, its AST node variant, and all related grammar/parsing
• Remove throws keyword and exception specifications from operations
• Remove @throws doc comment tag and ThrowsTag type
• Remove exception-related validators, encoding/type-ref patchers, and tests
• Remove error code E041 (ExceptionSpecificationNotSupported) and renumber
• Update doc comments, wrapper macros, and visitor trait accordingly

[Copilot]

Pull request overview

This PR removes exception support from the slicec compiler pipeline, including grammar/parsing, AST representation, patching/validation, diagnostics, and associated tests/documentation.

Changes:

• Removed exception definitions and operation throws clauses from the Slice grammar, lexer tokens, and AST model.
• Removed @throws doc comment support and all exception-related validators/patchers/visitor hooks.
• Deleted exception-focused test suites and updated remaining tests/error messages to reflect the new grammar and diagnostic code renumbering.

Reviewed changes

Copilot reviewed 41 out of 41 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
slicec/tests/parser_tests.rs	Updates expected parser error token list after removing exception.
slicec/tests/optional_tests.rs	Removes Slice1 optional tests that relied on exceptions; keeps non-exception optional behavior tests.
slicec/tests/interfaces/operations.rs	Removes tests for throws clauses and exception specification validation.
slicec/tests/exceptions/tags.rs	Removes exception tag tests (file deleted).
slicec/tests/exceptions/mode_compatibility.rs	Removes exception mode compatibility tests (file deleted).
slicec/tests/exceptions/mod.rs	Removes exception test module entrypoint (file deleted).
slicec/tests/exceptions/inheritance.rs	Removes exception inheritance tests (file deleted).
slicec/tests/exceptions/container.rs	Removes exception container/field tests (file deleted).
slicec/tests/exception_tests.rs	Removes top-level exception test harness module (file deleted).
slicec/tests/compilation_mode_tests.rs	Updates expected parser error token list after removing exception.
slicec/tests/comment_tests.rs	Removes @throws/throws usage from doc comment tests.
slicec/src/visitor.rs	Removes exception visitation APIs and traversal of exception definitions.
slicec/src/validators/operations.rs	Removes exception-spec validation and @throws doc-comment validation.
slicec/src/validators/mod.rs	Removes exception validation visit hook.
slicec/src/validators/identifiers.rs	Removes redefinition checking traversal for exceptions.
slicec/src/validators/cycle_detection.rs	Updates cycle-detection commentary after exception removal.
slicec/src/validators/comments.rs	Removes “only operations can throw” doc-tag validation logic.
slicec/src/slice_file_converter.rs	Makes AST->encoding conversion exhaustive without exception handling.
slicec/src/patchers/type_ref_patcher.rs	Removes patching of base exceptions and operation exception specs.
slicec/src/patchers/encoding_patcher.rs	Removes exception supported-encoding computation and related optional suggestion logic.
slicec/src/patchers/comment_link_patcher.rs	Removes @throws link resolution/patching and simplifies patch application signature.
slicec/src/parsers/slice/tokens.rs	Removes exception/throws token kinds.
slicec/src/parsers/slice/mod.rs	Removes exception_keyword/throws_keyword expected-token mapping.
slicec/src/parsers/slice/lexer.rs	Stops lexing exception/throws as keywords.
slicec/src/parsers/slice/grammar.rs	Removes exception construction and throws clause handling in operations.
slicec/src/parsers/slice/grammar.lalrpop	Removes exception and exception specification productions; updates operation production.
slicec/src/parsers/comments/tokens.rs	Removes @throws token kind.
slicec/src/parsers/comments/lexer.rs	Stops lexing/validating @throws tags.
slicec/src/parsers/comments/grammar.rs	Removes throws collection from DocComment construction.
slicec/src/parsers/comments/grammar.lalrpop	Removes ThrowsBlock grammar and integration.
slicec/src/grammar/wrappers.rs	Removes exception variants from Definition, Entities, and Attributables wrappers.
slicec/src/grammar/elements/operation.rs	Removes exception_specification from Operation.
slicec/src/grammar/elements/mod.rs	Removes exception module export wiring.
slicec/src/grammar/elements/exception.rs	Removes Exception element definition (file deleted).
slicec/src/grammar/comments.rs	Removes ThrowsTag and throws storage from doc comments.
slicec/src/grammar/attributes/oneway.rs	Updates oneway validation to consider only return types (no throws).
slicec/src/diagnostics/lints.rs	Updates lint documentation to remove @throws references.
slicec/src/diagnostics/errors.rs	Removes exception-spec error and renumbers diagnostic codes accordingly.
slicec/src/ast/node.rs	Removes Node::Exception and related conversions.
slicec/src/ast/mod.rs	Updates find_element docs example type away from Exception.
.vscode/cspell.json	Removes exception-related spelling entry (unthrowable).

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[InsertCreativityHere]

Look good to me!
Only boring comment comments like usual : vP

[InsertCreativityHere]

Cool!