feat(hud): cache savings badge (Wave 2-C)#1475
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Claude API's prompt caching discounts cache_read_input_tokens by 90%. This module quantifies that saving so the HUD can surface "💰$4.56 saved" as a badge appended to the cost segment. New lib/hud_cache_savings.py: - compute_cache_savings(cache_read_tokens, model_id) -> float Pure arithmetic helper with defensive coercion for malformed input. - format_cache_savings(stdin_data) -> str End-to-end renderer that reads Claude Code stdin, extracts cache_read_input_tokens and model.id, returns "💰$N.NN saved" or "" below the $0.01 noise floor. - Known model families: haiku ($0.80/M), sonnet ($3/M), opus ($15/M). Unknown models fall back to sonnet-tier pricing (conservative). 26 new tests in test_hud_cache_savings.py cover: - All 3 model families + unknown + empty - Case-insensitive matching - Zero / negative / non-numeric / numeric-string inputs - Empty stdin / missing context_window / missing current_usage - Below $0.01 noise floor - display_name fallback when model.id is absent - Two-decimal formatting Part of #1464 (Wave 0 statusbar refactor)
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Combined Wave 0 polish items from the #1465/#1485 review cycle: 1. Narrow `except Exception` to `except ImportError` in the 3 lib fallback import blocks (qual-1465 HIGH-1). Real logic bugs (SyntaxError, NameError, AttributeError) inside lib modules now surface immediately instead of being silently swallowed by a catch-all. 2. Drop inline stub functions for format_rate_limits and _get_fresh_version (qual-1465 HIGH-2). Eliminates the signature drift between canonical lib definitions and in-file fallback stubs observed on the integrator branch (Wave 1-A plugin_json_file kwarg drift). The outer main() try/except still catches any runtime failure and emits the minimal safe output via the BUDDY_FACE constant. 3. Hoist hud_velocity and hud_cache_savings imports to module top as _format_velocity_segment and _format_cache_savings (perf-1485 H1). Eliminates ~0.47us sys.modules lookup per render. Integrator branch only - no-op on refactor/wave branches where the inline imports don't exist yet. 4. Bump next to 16.2.3 for GHSA-q4gf-8mx6-v5v3 (landing-security-check). Aligns eslint-config-next and updates setup.test.ts assertion. Refs: qual-1465 HIGH-1/2, perf-1485 H1, GHSA-q4gf-8mx6-v5v3
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Superseded by #1485This PR was part of a stacked PR structure ( All of this PR's commits have been consolidated into #1485 (now with
EVAL review results from this PR (all reviewers, iter1 converged → Critical=0, High=0) already applied in #1485. Closing as superseded. Use #1485 with GitHub's Rebase and merge button to land all 12 commits linearly on master. |
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Closes #1474. Stacked on #1465. 26 new tests. 155/155 pass.