fix(stdlib): rename total var to tot (#135 slice 4)

[hyperpolymath]

#135 slice 4. The triage hypothesised a block/statement LR ambiguity for testing.affine:302 / math.affine:354. Precise isolation disproved that — every minimal block/stmt shape parses. Real cause: keyword-as-identifier (slice-6 class) — total is the TOTAL reserved keyword (totality marker). "let total = 0.0;" fails to parse; "let tot = 0.0;" parses.

Renamed the total variable to tot in math.affine (mean/sum_float; also let mut — they reassign in a loop) and testing.affine (bench). The total_time record field is a distinct identifier (left unchanged); string-literal text untouched. Pure stdlib rename — zero grammar/compiler risk.

Verification: math.affine PARSE 354 to RESOLVE (trunc undefined — distinct); testing.affine PARSE 302 to TYPECHECK (distinct deeper defect). Both clear the parse wall. traits.affine:124 is unrelated (while-let pattern binding — genuine separate construct, still tracked). Full suite green (233 tests), stdlib-only, no regression.

Advances #135 (does not close). Refs #128, #135.

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 44 issues detected

Severity	Count
🔴 Critical	12
🟠 High	21
🟡 Medium	11

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