policy: add Rule 5 — games and interactive entertainment are AGPL-3.0

LICENCE-POLICY.adoc

@@ -7,7 +7,7 @@ Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>
 Canonical licence policy for all hyperpolymath repositories and code.
 All contributors and AI agents must follow this document.
 
-== Four Rules
+== Five Rules
 
 === Rule 1 — MPL-2.0 for Code, CC-BY-SA-4.0 for Prose Docs
 
@@ -139,6 +139,73 @@ Rule 4 work keeps its MPL-2.0 header. MPL-2.0's default form (Exhibit A
 without Exhibit B) is explicitly compatible with combination into an
 AGPL Larger Work.
 
+=== Rule 5 — AGPL-3.0 for Games and Interactive Entertainment
+
+Owner ruling 2026-08-26.
+
+Projects that are *played* rather than *built upon* are
+`AGPL-3.0-or-later` for code and `CC-BY-SA-4.0` for prose, on the same
+split as Rule 1.
+
+**Rationale, in the owner's terms.** If a thing is made to help the world
+practically, it is MPL-2.0 so it can spread with as little friction as
+possible. If a thing is a game, it is AGPL: the intent is not maximal
+adoption by other builders, and AGPL §13 is the only clause in the family
+that reaches a hosted or networked deployment. Games are precisely the
+category most likely to be run as a service rather than distributed as a
+copy, so Rule 1's distribution-triggered copyleft would not be reached.
+
+**This broadens Rule 3.** Rule 3 is a *relationship* test — projects
+co-developed with Joshua. Rule 5 is a *subject-matter* test and applies
+regardless of who co-develops. A game co-developed with Joshua satisfies
+both; a solo game satisfies only Rule 5 and is still AGPL. Rule 3a
+(owner-only components inside an AGPL work stay MPL-2.0) applies here
+unchanged.
+
+**Why this rule had to be written down.** `chronicles-of-slavia` and
+`688-attack-hub` were already AGPL but appear in no rule's named list, so
+by the previous text they read as drift — and a 2026 sweep (#40) did in
+fact flatten two AGPL games back toward the default. A rule that exists
+only as an intention gets "corrected" by the next automated pass.
+
+==== Members
+
+Confirmed by the owner 2026-08-26, verified against each repo's root
+`LICENSE`:
+
+[cols="2,1,3"]
+|===
+|Repo |Status |Note
+
+|`chronicles-of-slavia` |already AGPL |Slavic-folkloric narrative game
+|`688-attack-hub` |already AGPL |idle/strategy toy
+|`IDApTIK` |already AGPL |also Rule 3
+|`airborne-submarine-squadron` |already AGPL |also Rule 3
+|`f117a-stealth-glider` |already AGPL |Conway's-Life stealth puzzle
+|`f19-stealth-glider` |already AGPL |Conway's-Life stealth puzzle
+|`the-nash-equilibrium` |already AGPL |6X strategy board game
+|`paint-type` |Rule 3 names it AGPL |root `LICENSE` not machine-readable — verify
+|`sr71-blackglider` |**MPL, to flip** |formally-verified Conway's-Life engine
+|`proof-of-work` |**MPL, to flip** |cryptographically-verified puzzle game
+|`road-skate` |**MPL, to flip** |retro driving game
+|`megadog` |**MPL, to flip** |ethical merge game
+|===
+
+==== Explicitly NOT in Rule 5
+
+* `knot-rider` — owner ruling 2026-08-26: despite the name, this is an
+  *exploration of knots*, not a game. Stays MPL-2.0 under Rule 1.
+* `project-ovine` — an experimental herding game that exists as a
+  *proving ground* for the enaction engine. The game is the test
+  harness, not the product. **Not yet ruled**; stays MPL-2.0 until it is.
+
+==== Execution constraint
+
+Per A2, the four flips above are **manual, per-file, owner-only**. No
+agent or script may perform them. This section records *what* is to
+change and *why it is correct*; it does not authorise an automated sweep,
+and the presence of a name in the table above must never be read as one.
+
 == SPDX Header Quick Reference
 
 [cols="2,3,2"]