v0.2.1 — onboard confparse, proxycheck, gorequests

Onboarded three more OSS projects — confparse, proxycheck, and
gorequests — and drove the first two through the SDD task loop.

Added

• The confparse project: living spec written; submodule relicensed to MIT with
  a docs/CI refresh and pinned at v0.0.4.
• The proxycheck project: living spec written, then delivered through the SDD
  task loop — 001 (CI workflow fix, PR #1) and 002 (judge-flag fix, PR #2).
  Submodule relicensed to MIT and pinned at v0.0.6.
• The gorequests project: living spec written, with tasks 001 (modernize CI)
  and 002 (fix exec short-body panic) specified. Submodules gorequests,
  gorequests-proxy, and gorequests-retry imported and pinned.