docs: add changelog for releases through v0.2.30

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

CHANGELOG.md

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+# Changelog
+
+# v0.2.30
+
+A big run for the training grounds: OPORD Recall joins the lineup, you can build your own minefields and radio tests, the Chronicle grows story beats, and the dashboard bends to your will.
+
+### Features
+
+- **OPORD Recall**: a new briefing-recall minigame. Study an Arma-style briefing (grids in the 034-672 format), then answer questions about what you read. Tiers scale to 10, 15, or 20 questions, drawing on garrison details, ROE, intel, and secondary objectives. Each answer unlocks behind a 2-second countdown with a draining timer bar, aborting mid-run offers six contingency options, and Esc or R resets at any time. Per-tier best times sit on the leaderboard, beating the par time pays a speed bonus, and an anti-cheat pass keeps results honest.
+- **Custom minefields**: author and share your own EOD minefields, with play and leaderboard included. Clear two sectors in the regular game to unlock them. Runs pay reduced XP and a slice goes to the field's creator. Authors decide whether edge mines are exposed up front, hidden cells show a question-mark fog, and a loss reveals only part of the field.
+- **Custom radio tests**: build your own radio traffic tests with the same play-and-leaderboard setup, unlocked through the radio game.
+- **Chronicle story beats**: the Chronicle now carries structured story beats with reactions, tracks what you've already read, and has a chapter table of contents with hover previews.
+- **Personal dashboard**: rearrange the dashboard with drag-and-drop widgets instead of a fixed layout.
+- **Campaigns rework**: the campaigns page splits into official and community sections. Official campaigns get the tactical card treatment, glitch flourish included, and the list can hide completed campaigns.
+- **Voiceover**: recording pages gate script spoilers behind a hold-to-confirm, script authors can keep drafts hidden from players, staff get an audio preview in the admin panel, and approved reviews now pay out XP and notify you.
+- **Missions**: a code name is no longer required, and missions can carry a custom cover image.
+
+### Improvements
+
+- Side op uploads accept mod lists pasted as plain text or HTML, and the narrative section stays collapsed until you open it.
+- All minigames moved under `/minigames/*`. Old links redirect, so bookmarks keep working.
+
+### Fixes
+
+- Mission visibility rules are now enforced everywhere: collection reads, the missions pages, the dashboard, and intel queries.
+- The radio unlock progress readout can no longer overstate how close you are to unlocking custom content.
+- The login return link lands you back on the page you came from, minigames included.
+- Dashboard cards that stretch now fill their cell and truncate instead of spilling over.
+- OPORD quiz answers wrap long text instead of running off the button.