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feat(ucalc): overflow/underflow map command (clip) (#651)

* feat(ucalc): overflow/underflow map command (#630)

Add `clip <type> <data>` command that categorizes a distribution
against a target type's dynamic range:
- representable: value fits within type's range
- clipped: |value| > maxpos (overflow, split by +/- direction)
- flushed: 0 < |value| < minpos (underflow to zero)
- exact zeros: input was exactly 0

Supports inline vectors and CSV file loading. Reports type range
and data range for context.

Quiet mode one-liner: "99.8% 0clip 19flush" for quick comparison.
All output formats: plain, --json, --csv, --quiet.
21/21 CTests pass on gcc.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* docs(ucalc): comprehensive documentation update for all commands

Update tools/ucalc/README.md and docs/tutorials/ucalc-repl.md with
complete documentation covering all Phase 2 and Phase 3 commands.

README.md rewritten to cover:
- 20+ commands organized by category (inspection, forensics, quantization)
- CLI flags (--json, --csv, --quiet, -t, -f)
- 10 worked examples covering all major features
- Script directory listing (12 example scripts)
- Architecture overview

docs/tutorials/ucalc-repl.md updated with:
- CLI flags reference table
- Three command categories with full tables
- 5 new examples: trace, audit, quantize, heatmap, diverge

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix(ucalc): remove unused hist_bins, fix data_min for all-zero input

Remove unused constexpr hist_bins leftover from earlier draft.
Set data_min to 0.0 when all input values are zero (was left at
numeric_limits::max).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix(ucalc): use explicit bounds for clip overflow detection

The clipping check used abs(x) > maxpos, which misclassified
representable asymmetric negatives (e.g., -128 in int8 where
maxpos=127). Now checks x > maxpos for positive overflow and
x < ... (continued)

44581 of 52858 relevant lines covered (84.34%)

6108020.82 hits per line

Coverage Regressions

Lines Coverage ∆ File
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 -0.48% include/sw/universal/number/cfloat/cfloat_impl.hpp
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Jobs
ID Job ID Ran Files Coverage
1 23690843850.1 630
84.34
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Source Files on build 23690843850