Fix Pounce support socket counting

[unrealdreamz]

Summary

Fixes #1672

Stop active-skill internal support effects from being counted as socketed support gems when validating the five-support socket limit.

Root Cause

Pounce is an active skill gem that also exports an internal support effect. During setup, socket-limit validation counted any gem instance with supportEffect, so Pounce itself was counted as one support before the five actual socketed supports were counted. A legal Pounce setup with five support gems therefore appeared to have six supports and produced the "too many gems" warning.

Fix

• Count only gem instances whose own granted effect is a support gem when calculating socketed support-gem totals.
• Use that same socketed support effect for red/green/blue support requirement counters.
• Add a regression covering Pounce with five socketed supports and a control case with six actual socketed supports.

Validation

• gh pr list --repo PathOfBuildingCommunity/PathOfBuilding-PoE2 --state all --search "#1672" --json number,title,state,url,headRefName,author --limit 20 -> []
• gh pr list --repo PathOfBuildingCommunity/PathOfBuilding-PoE2 --state all --search "Pounce too many gems" --json number,title,state,url,headRefName,author --limit 20 -> []
• gh pr list --repo PathOfBuildingCommunity/PathOfBuilding-PoE2 --state all --search "support gems socket limit" --json number,title,state,url,headRefName,author --limit 20 -> []
• git diff --check -> passed
• git diff --cached --check -> passed
• git show --check --oneline --no-renames HEAD -> passed
• Lua syntax check with Python/Lupa for spec/System/TestSkills_spec.lua -> passed
• Lua syntax check with Python/Lupa for src/Modules/CalcSetup.lua -> blocked by a pre-existing upstream Lupa parse failure at line 970 (attempt to assign to const variable 'slot'); confirmed the same failure on upstream/dev before this change.
• lua, luajit, busted, docker, and docker-compose are not installed on this Windows PATH, so I could not run the Busted suite locally.

Risk / Rollback

Risk is limited to socketed support-gem counting and support-color requirement totals. Item-granted/internal support effects should not consume sockets, while actual support gems still do. Rollback is the single commit on this branch.

[LocalIdentity]

Not needed anymore. Overcomplicated fix and handled by 4ec71b3