go-best-practices: add env preflight and verification honesty section

Document how agents should handle a local toolchain that cannot build
or test the project (e.g. missing libbpf bpf/bpf.h headers, missing
flutter/dart). Preflight the build/test path before trusting it, run
the smallest verifying subset that works, annotate the blocker via
ask annotate, and never claim full verification that did not run.

Scoped to MISSING/incomplete toolchains; slow/long-running test suites
are covered separately by task 9q0.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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