ci: fix advisory lane toolchain drift

[EffortlessSteven]

Summary

• force the advisory Miri lane to invoke nightly Cargo explicitly so the repo's pinned 1.92.0 override does not shadow the installed nightly toolchain
• do the same for sanitizer runs so -Zbuild-std and -Zsanitizer=* execute on nightly instead of stable Cargo
• install cross-compilation targets for the pinned workspace toolchain and append the aarch64 linker block safely so cross jobs stop failing on toolchain drift and malformed .cargo/config.toml

Validation

• git diff --check
• workflow YAML parses cleanly via ruby -e 'require "yaml"; YAML.load_file(".github/workflows/ci.yml")'
• verified locally that the pinned-toolchain extraction used in the new cross-target step resolves to 1.92.0

Intentionally Out Of Scope

• product-code failures on main, including adze-tablegen unexpected cfg(feature = "incremental_glr"), example pure-rust-glr cfg drift, minimal-versions dependency-floor failures, and the remaining runtime/feature-matrix issues

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 97c57614-9806-471b-8cf9-47055b081a85

📥 Commits

Reviewing files that changed from the base of the PR and between 55fa269 and fe8ad16.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/workflow-truthfulness

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[github-actions]

Benchmark Results

Benchmark Comparison

Benchmark	Baseline	Current	Change	Status
lexer_arithmetic_expression	80,324 ns	77,299 ns	-3.8%	✓ No change
lexer_complex_program	458,457 ns	458,417 ns	-0.0%	✓ No change
lexer_long_expression	89,700 ns	87,403 ns	-2.6%	✓ No change
lexer_long_identifier	76,429 ns	73,056 ns	-4.4%	✓ No change
lexer_many_tokens	187,726 ns	201,552 ns	+7.4%	✓ No change
lexer_nested_expression	86,818 ns	84,515 ns	-2.7%	✓ No change
lexer_simple_program	260,073 ns	271,762 ns	+4.5%	✓ No change
parse_deeply_nested	85,785 ns	85,745 ns	-0.0%	✓ No change
parse_highly_ambiguous	154,503 ns	157,999 ns	+2.3%	✓ No change
parse_maximum_forks	128,412 ns	132,291 ns	+3.0%	✓ No change
parse_simple_expression	73,049 ns	70,988 ns	-2.8%	✓ No change

✅ No performance regressions detected.

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