v1.8.0 — Safety, lifecycle management, self-deprecation

Major release — merges @thepiper18's hardening PR (#8) with 28 new tests (75 total).

The interceptor now knows when it's no longer needed.

As Anthropic fixes upstream bugs (v2.1.90 fixed the stuck-5m TTL bug, v2.1.104 mitigated the resume-scatter issue), the interceptor's bug-fix layer transitions toward dormancy. This release adds the lifecycle management to handle that transition gracefully.

New features

• Fingerprint round-trip safety check — before rewriting cc_version, verifies our salt/indices reproduce CC's fingerprint. If verification fails, the rewrite is skipped. The interceptor can never make cache performance worse than stock CC.
• Master kill switch — CACHE_FIX_DISABLED=1 disables all bug fixes while keeping monitoring + optimizations active.
• Per-fix toggles — CACHE_FIX_SKIP_{RELOCATE,FINGERPRINT,TOOL_SORT,TTL,IDENTITY} for granular control as individual bugs are fixed upstream.
• Dormancy detection — tracks per-fix effectiveness. When a fix hasn't been needed across multiple sessions, the health line reports it as dormant and suggests disabling it.
• Regression detector — monitors cache_read ratio. Warns if it drops below 50% across 5+ calls, especially useful after disabling fixes.
• Health status line — on first API call: relocate=active(2h ago) fingerprint=dormant(5 clean sessions) tool_sort=active ttl=active identity=waiting
• Portuguese guide — docs/guia-pt-br.md, credit @thepiper18

The three-purpose lifecycle

Purpose	Examples	Lifecycle
Bug fixes	Relocate, fingerprint, tool sort, TTL	Temporary — obsolete when CC fixes upstream
Monitoring	Quota tracking, TTL tier, cache hit rate	Permanent
Optimizations	Image stripping, output efficiency	Permanent, opt-in

CACHE_FIX_DISABLED=1 disables the first category only.

Context

This release ships the same day as our Part 2 blog post and the Part 1 correction updating the v2.1.81 pin recommendation to v2.1.104. The lifecycle management in this release is what makes that transition safe — users on v2.1.104 get told which fixes are still needed and which are dormant.