[Bug] Auto-compact threshold change in 2.1.117 causes 5x token usage increase without notification

Bug Description
2.1.117 changed Opus 4.7 auto-compact threshold from ~200K to ~1M tokens. Because every turn re-sends context, this 5x'd tokens-per-turn on identical workflows. Combined with Pro/Max default effort going medium → high in the same release, I exhausted both my Max 20x plan AND my Team plan in a single day with no workflow change. Prior daily usage used a small fraction of the same limits. This was listed as a "Fixed" bullet but is effectively a ~5x reduction in how many turns a subscription sustains per 5-hour window. That's a pricing- impact change, not a bug fix, and subscribers weren't notified. Requests: 1. Flag subscriber-impacting defaults changes in release notes with an explicit "Impact on subscribers" callout. 2. Consider gating the compact threshold by subscription tier rather than just model context window — a Max subscriber on Opus 4.7 likely wants aggressive compacting even though the model supports 1M. 3. Add a one-line notification in Claude Code when a release changes a default that affects token consumption. Support ticket + public issue filed separately. Reference: github.com/anthropics/claude-code/issues/52519

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 2.1.118
• Feedback ID: c1186d90-476d-4596-ac2a-69fd618d9bda

Errors

[{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server github invalid: Missing environment variables: GITHUB_PERSONAL_ACCESS_TOKEN\n    at oJH (/$bunfs/root/src/entrypoints/cli.js:2756:30506)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-23T18:19:24.925Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server github invalid: Missing environment variables: GITHUB_PERSONAL_ACCESS_TOKEN\n    at oJH (/$bunfs/root/src/entrypoints/cli.js:2756:30506)\n    at async G (/$bunfs/root/src/entrypoints/cli.js:6144:11019)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-23T18:19:25.505Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server github invalid: Missing environment variables: GITHUB_PERSONAL_ACCESS_TOKEN\n    at oJH (/$bunfs/root/src/entrypoints/cli.js:2756:30506)\n    at async L (/$bunfs/root/src/entrypoints/cli.js:6144:11825)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-23T18:19:25.505Z"},{"error":"Error: 429 {\"type\":\"error\",\"error\":{\"type\":\"rate_limit_error\",\"message\":\"This request would exceed your account's rate limit. Please try again later.\"},\"request_id\":\"req_011CaMB1jBmwfqpmmom5N9g2\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:55186)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:50:4943)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-23T18:26:18.347Z"},{"error":"Error: 429 {\"type\":\"error\",\"error\":{\"type\":\"rate_limit_error\",\"message\":\"This request would exceed your account's rate limit. Please try again later.\"},\"request_id\":\"req_011CaMB8BsomGAKTsmAhVzci\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:55186)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:50:4943)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-23T18:27:45.971Z"},{"error":"Error: 429 {\"type\":\"error\",\"error\":{\"type\":\"rate_limit_error\",\"message\":\"This request would exceed your account's rate limit. Please try again later.\"},\"request_id\":\"req_011CaMB9iu98L64gTNJCW1nW\"}\n    at generate (/$bunfs/root/src/entrypoints/cli.js:11:55186)\n    at makeRequest (/$bunfs/root/src/entrypoints/cli.js:50:4943)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-23T18:28:07.…

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