Summary

Upgrade the PCECommunityToken beacon on Polygon to v17 for PIP-21.

This proposal:

• fixes path-dependent multi-period community-token decay;
• converts afterDecreaseBp to WAD precision before exponentiation-by-squaring;
• adds direct setTokenSettings validation for afterDecreaseBp <= 10000;
• keeps PCEToken unchanged.

On-chain effect

This proposal executes one Ethereum-side action:

• GovernanceSender(0xA197c53c9658C21d4246De66f38012536028B2FB).sendCrossChainGovernance(...)

The forwarded Polygon Timelock batch executes, in order:

1. PCEToken(0xA4807a8C34353A5EA51aF073175950Cb6248dA7E).updateFactorIfNeeded().
2. PCECommunityToken.updateFactorIfNeeded() for every community token returned by PCEToken.getTokens() at proposal preparation time.
3. PCECommunityToken beacon(0x6A73A610707C113F34D8B82498b6868e5f7FAA74).upgradeTo(0xc4aC6E2A3c116ECFFa4a3a461ffEB378c5DeF8Cd).

This materializes pending decay under the pre-upgrade implementation before switching future community-token decay to the fixed v17 formula.

Verification

• PIP: https://github.com/peacecoin-protocol/PIPs/pull/16
• core implementation PR: https://github.com/peacecoin-protocol/core/pull/46
• core tag: https://github.com/peacecoin-protocol/core/tree/v17
• new PCECommunityToken implementation: https://polygonscan.com/address/0xc4aC6E2A3c116ECFFa4a3a461ffEB378c5DeF8Cd#code
• forge test: 81 passed
• storage layout validated against v16 with script/upgrade.sh
• DEV deployment completed before this proposal:
  • DEV PCECommunityToken beacon implementation: 0xd3B84F3EDd825c26CAf34313caC7BC2039fB52E1
  • DEV sample community token version(): 1.0.17

Contract versions

• PCEToken.version() remains 1.0.15.
• PCECommunityToken.version() becomes 1.0.17.

Notes

No raw balances, token settings, storage layout, or event schemas are migrated by this proposal. Historical over-decay compensation is out of scope for PIP-21.