feat: add Code Farm cooperative idle game with plot-based crop system and pub/sub notifications

Implement a Farmville-style cooperative idle game mounted at `/game` with member-only play and public farm viewing. The data layer is pure and timestamp-driven with no background tick: plot states are derived from `ready_at` vs current time, never stored. Key features include plantable software projects (shell script through kernel) that build over real time, harvest for coins and XP, CI tier upgrades for faster builds, plot purchasing with doubling cost, watering mechanics for friends' builds, daily quests, and prestige system. All game endpoints negotiate HTML or JSON and return full farm state for single-request client refresh. Pub/sub notifications broadcast farm updates on `public.game.farm.{username}` topics. Database schema adds `game_farms`, `game_plots`, and `game_quests` tables with appropriate indexes.

README.md

@@ -81,6 +81,7 @@ devplacepy/
 | `/block` | Block/unblock a user: hides all of their posts, comments and messages from you everywhere except their own profile, and stops them notifying you |
 | `/mute` | Mute/unmute a user: stops them creating notifications for you while their content stays visible |
 | `/leaderboard` | Contributor ranking by total stars earned |
+| `/game` | **Code Farm** cooperative idle game (member-only): plant projects that build over real time, harvest coins and XP, upgrade CI, buy plots, and water friends' builds at `/game/farm/{username}`. Live over pub/sub; every endpoint negotiates JSON |
 | `/avatar` | Multiavatar proxy with in-memory cache |
 | `/issues` | Issue tracker backed by Gitea: list/detail/comment/status, AI-enhanced filing, an admin planning report over a selectable set of open tickets (each ticket's full text reproduced verbatim so the document hands straight to a coding agent), and file attachments on open issues and comments (mirrored to the Gitea tracker) |
 | `/admin/services` | Background service management (start/stop, config, status, logs) |
@@ -110,6 +111,24 @@ Member progression is driven by activity and peer recognition.
 
 Every AI gateway response (`/openai/v1/*`) also returns per-call `X-Gateway-*` headers with the full token breakdown and the dollar cost of that call, so any client can read its own usage.
 
+## Code Farm
+
+The **Code Farm** (`/game`) is a cooperative idle game in the spirit of Farmville, themed for developers. Each member owns a farm of plots and plays asynchronously - nothing has to happen in real time.
+
+- **Plant.** Plant a software project (a shell script, Python script, web app, Go service, Rust engine, compiler, or kernel) in an empty plot for a coin cost. Higher-tier crops unlock as your farm level rises.
+- **Build and harvest.** A planted crop builds over real time; when the build finishes, harvest it for coins and XP. Harvesting also awards site XP and the **Green Thumb** / **Master Farmer** badges.
+- **Upgrade CI.** Spend coins to raise your CI tier (Local Build through Distributed Cache); each tier makes every build faster.
+- **Buy plots.** Unlock more plots (up to twelve); each new plot costs more than the last.
+- **Fertilize.** Spend coins on a growing build to instantly halve its remaining time.
+- **Daily bonus.** Claim a coin bonus once per day; consecutive days build a streak that grows the reward (capped at seven days).
+- **Daily quests.** Three quests rotate every day (plant, harvest, water, or earn goals), tracked automatically as you play; claim each one for coins and XP when complete.
+- **Perks.** Spend coins on four permanent upgrades - Optimizer (+harvest coins), Build Cache (+build speed), Bulk Licenses (-planting cost), and Mentorship (+harvest XP) - each levelling up with escalating cost.
+- **Refactor (prestige).** At level 10 you can refactor: the farm resets (coins, level, CI, extra plots, perks) in exchange for a permanent +25% coin bonus that stacks with every refactor.
+- **Visit and water friends.** Open another member's farm at `/game/farm/{username}` and water their growing builds to speed them up - you earn coins for helping, and the owner sees the help live. This is the social loop that makes the game cooperative.
+- **Leaderboard.** Top farmers are ranked by level, XP, and total harvests, shown alongside your own farm.
+
+The farm refreshes live over the pub/sub bus (a watered build appears on the owner's screen at once) and every plot countdown ticks client-side. Every endpoint also answers JSON, and Devii can play the game on the member's behalf via the `game_*` tools (`game_state`, `game_plant`, `game_harvest`, `game_buy_plot`, `game_upgrade_ci`, `game_water`, `game_view_farm`, `game_leaderboard`). See the API reference group **Code Farm**.
+
 ## Engagement
 
 - **Emoji reactions** - a fixed palette of reactions on posts, comments, gists, and projects, separate from voting and carrying no ranking weight.