c: basic map implementation

[serkonda7]

No description provided.

[Copilot]

Pull request overview

This PR adds initial C-backend support for Bait map by introducing a builtin C map implementation and extending the C code generator to emit map types, literals, and for ... in iteration over maps.

Changes:

• Add lib/builtin/map.c.bt implementing a basic open-addressing map with insertion-order key tracking and keys().
• Extend the C generator to support map literals (ast.MapInit), map type typedefs, and for ... in over maps.
• Adjust tests/CI to account for moved tests and to cover new for-in and map.keys() behavior.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/other/bitwise_test.bt	Removes old location of unsigned-not test (moved).
tests/int/bitwise_test.bt	Moves unsigned-not test here; updates SPDX header.
tests/for/labels_test.bt	SPDX header update only.
tests/for/for_in_test.bt	SPDX header update; includes map iteration test used by C CI.
lib/hash/fnv1a/fnv1a.bt	SPDX header update only.
lib/builtin/tests/map_test.bt	Adds assertion for deterministic keys() ordering after insertion.
lib/builtin/map.c.bt	New C-backend builtin map implementation (hashing, set/get, rehash, keys).
lib/bait/gen/c/type.bt	Adds Map typedef emission for map instantiations; updates type-name sanitization.
lib/bait/gen/c/stmt.bt	Implements for ... in over maps in C backend via Map_keys.
lib/bait/gen/c/expr.bt	Implements C codegen for map literals; fixes map set cast to Map*.
lib/bait/gen/c/cgen.bt	Updates C identifier sanitization to handle [/] in type names.
.github/workflows/ci.yml	Runs tests/for/for_in_test.bt for C; enables lib/os; bitwise test run is commented out.

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