docs: add v0.2.0 changelog entries — weekly audit 2026-06-23

[krakenhavoc]

Weekly Documentation Audit — 2026-06-23

Supersedes #21.

Documentation gaps identified

• CHANGELOG.md contained only a v0.1.0 entry with no [Unreleased] section
• v0.2.0 features (scan API) had shipped but were entirely absent from the changelog
• No version bump had been documented

Changes made

CHANGELOG.md:

• Added empty ## [Unreleased] at top
• Added ## [0.2.0] - 2026-05-03 with the following entries:
  • Added POST /scan endpoint (public scan API)
  • Added KK_PROBE_SCAN_API_ENABLED environment variable (default: false)
  • Added KK_PROBE_SCAN_API_SECRET environment variable for X-Probe-Secret header authentication
  • Added ScanAPIConfig struct
• Added link reference for [0.2.0] diff vs [0.1.0]
• Preserved v0.1.0 entry and its link reference unchanged

Status note

#21 remains open and unmerged. This edition carries forward the same gaps — the fix is on branch claude/loving-maxwell-q4s61x. Close #21 once this PR is reviewed.

Suggested version bump

The v0.2.0 features are already shipped. Ensure the v0.2.0 git tag exists on main and points to the correct merge commit.