cache-tax 1.0.3: price Sonnet 5, date the lapse from expiry

[karanb192]

Summary

• Sonnet 5 was priced at Sonnet 4.x rates. A sonnet-5 price row [0.2, 2.5, 4] (cache read, 5m write, 1h write, dollars per million tokens) now takes precedence through the longest-key match; claude-sonnet-4-6 still resolves to sonnet.
• The guard, the card and the status line reported "lapsed X ago" with X as the time since the last request. They now report the time since the cache expired (age minus the tier TTL, clamped at zero).
• Plugin version 1.0.2 to 1.0.3.

Details

plugins/cache-tax/cache-tax.js

• DEFAULT_PRICES gains 'sonnet-5': [0.2, 2.5, 4] above the sonnet row; the matcher comment now cites sonnet-5 over sonnet as its example.
• stateFrom adds lapsedSec: Math.max(0, -leftSec) to the live state (and lapsedSec: 0 on the compacted branch so the shape is stable). leftSec and the warm "cache Nm left" text are unchanged.
• statusLine ("cache LAPSED X ago"), guardMessage ("the 1h prompt cache lapsed X ago") and renderCard ("COLD, lapsed X ago") format st.lapsedSec instead of st.ageSec. The compacted "reset by /compact X ago" line still uses ageSec, which is correct there.

plugins/cache-tax/README.md

• Built-in list rates sentence lists Sonnet 5 [0.2, 2.5, 4] separately from Sonnet 4.x [0.3, 3.75, 6].
• The verbatim guard example reads "lapsed 2h00m ago" (three hours since the last request on the 1h tier); every other number is unchanged.
• "How it decides" states that the "lapsed N ago" figure is the time since expiry, not since the block.

plugins/cache-tax/.claude-plugin/plugin.json

• version 1.0.2 to 1.0.3.

plugins/cache-tax/tests/cache-tax.test.js

• Family test: claude-sonnet-5 maps to sonnet-5, claude-sonnet-4-6 to sonnet.
• New test prices Sonnet 5 below Sonnet 4.x: priceFor returns [0.2, 2.5, 4] for sonnet-5 and [0.3, 3.75, 6] for sonnet-4-6.
• State test asserts lapsedSec is about 3600 for a two-hour-old block on the 1h tier.
• Status line fallback for a two-hour-old transcript expects cache LAPSED 1h00m ago.
• Guard integration test for a three-hour-old transcript expects the 1h prompt cache lapsed 2h00m ago.
• Card test transcript moved to four and three hours old so the card reads COLD, lapsed 2h00m ago; cost and session totals unchanged.

Test plan

• npm test from the repo root: 1929 pass, 0 fail, 0 skipped (1928 before this change, one test added).
• git diff --check origin/main: clean.
• Grep for en and em dashes across the changed files: none.