sharing 4/7: Transfer runtime (controllers, economy boundary, gadget swap)

[keithharvey]

📚 Stacked split of #5704 — review bottom-up

• 1/7 · Transfer library (enums, comms, serialization, test infra) (sharing 1/7: Transfer library (enums, comms, serialization, test infra) #8125)
• 2/7 · Modes & economy boundary (presets, waterfill, share ledger) (sharing 2/7: Modes & economy boundary (presets, waterfill, share ledger) #8126)
• 3/7 · Policies (context -> policy -> policy_result -> action) (sharing 3/7: Policies (context → policy → policy_result → action) #8123)
• 4/7 · Transfer runtime (controllers, economy boundary, gadget swap) (sharing 4/7: Transfer runtime (controllers, economy boundary, gadget swap) #8062) ← you are here
• 5/7 · Tech Core / Keystone (sharing 5/7: Tech Core / Keystone #8063)
• 6/7 · Sharing Tab UI (sharing 6/7: Sharing Tab UI #8064)
• 7/7 · Game modes export (export widget, headless startscript, CI workflow) (sharing 7/7: Game modes export (widget, headless startscript, CI workflow) #8095)

Each PR is file-partitioned: every file appears in exactly one PR in its final sharing_tab form, so each PR's diff is byte-identical to that branch. Regenerated deterministically by just bar::sharing-split.

Summary (LLM-generated, claude-opus-4-6)

Adds the two runtime controllers — game_resource_transfer_controller (Lua-owned overflow redistribution via WaterfillSolver on the new ResourceExcess callin, plus the GG.* economy boundary that all gadgets now call through) and game_unit_transfer_controller (policy-driven AllowUnitTransfer / TeamShare with stun and build-delay penalties read from PolicyResult). Replaces six legacy gadgets (game_no_share_to_enemy, game_prevent_excessive_share, game_disable_unit_sharing, game_restrict_unit_sharing, game_tax_resource_sharing, game_restrict_resurrection) with mode-enum-driven equivalents (game_allied_unit_reclaim_mode, game_allow_partial_resurrection, game_disable_ally_geo_mex_upgrades, game_share_policy_forwarding), renames game_disable_assist_ally → game_allied_assist_mode, and migrates every synced caller from direct Spring.GetTeamResources / Spring.AddTeamResource / Spring.ShareTeamResource to the GG.* economy boundary. Introduces cmd_take as a standalone /take gadget supporting TakeMode.Enabled, StunDelay, and TakeDelay, adds ShareStats for Lua-side sent/received tracking via team rules params, and sets nativeExcessSharing = false / allowTake = false unconditionally in modrules.

[github-actions]

Integration Test Results

17 tests  +3   6 ✅ ±0   6s ⏱️ +3s
 1 suites ±0   8 💤 ±0 
 1 files   ±0   3 ❌ +3 

For more details on these failures, see this check.

Results for commit 7e7c599. ± Comparison against base commit 4945e13.

♻️ This comment has been updated with latest results.