Delete toolchain.json

[kreneskyp]

Deletions:

• spec_objects_security/schemas/toolchain.json
• In scripts/generate-schemas.mjs: the toolchain record (compiler, emitter and semantic-core name+version), the normalization record, the overall sha256 over emitted files, the emitted file inventory, the dependencyVersion helper, the node:crypto import, the rewritten-files tracking in normalize, and the toolchain.json write, compare and exclusion paths. Schema emission and the --check comparison of emitted vs committed schemas are unchanged.
• Tests: TC-020 (tests/test_schema_emission.py), the toolchain() helper and EXPECTED_MODELS, the toolchain.json assertions in TC-021, TC-027 and TC-030, and the toolchain.json skip clauses in tests/conftest.py, tests/test_security_rules.py and tests/test_role_schemas.py. TC-025 and TC-026 (wheel and npm tarball contents) are kept; they now compare against the committed schemas/*.json files.
• Spec: FR-002 Outputs bullet for toolchain.json, the "record each rewrite" and "applied: false" behavior clauses, the check clause "or toolchain.json differs", toolchain.json mentions in the $id rationale, bump procedure, CON-5 and AC-8, and AC FR-002-AC-1; TC-020 row in spec/tests.md. AC-6 and AC-7 keep their packaging requirement with the "every file toolchain.json lists" wording replaced by "every emitted schema".

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