Switch deadlines to block.timestamp; refresh proto decoders

[hhl42]

• Beaking change: migrates deadline / challenge-window / timeout from block.number to block.timestamp
• Refreshes Pb.sol / PbChain.sol / PbEntity.sol to the latest pb3-gen-sol output

[Copilot]

Pull request overview

This PR migrates all on-chain deadline/challenge-window semantics from block numbers to Unix timestamps (block.timestamp) and refreshes the Solidity protobuf decoders (Pb.sol, PbChain.sol, PbEntity.sol) from the latest generator output.

Changes:

• Replace deadline/timeout comparisons and stored time fields from block.number to block.timestamp across ledger, pay resolution, registry, and migration logic.
• Update Solidity tests to use vm.warp(...) and adjust assertions/events to timestamp-based deadlines.
• Regenerate protobuf decoder libraries and update proto sources + documentation/gas baselines accordingly.

Reviewed changes

Copilot reviewed 33 out of 33 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
test/utils/Base.t.sol	Warp timestamp in base setup to avoid underflow in timestamp math across tests.
test/gas_logs/fine_granularity/IntendSettle-OneState.txt	Update committed gas baseline values.
test/gas_logs/fine_granularity/ClearPays.txt	Update committed gas baseline values.
test/gas_logs/VirtContractResolver.txt	Update committed gas baseline values.
test/gas_logs/PayResolver.txt	Update committed gas baseline values.
test/gas_logs/CelerLedger-Migrate.txt	Update committed gas baseline values.
test/gas_logs/CelerLedger-ETH.txt	Update committed gas baseline values.
test/gas_logs/CelerLedger-ERC20.txt	Update committed gas baseline values.
test/RouterRegistry.t.sol	Switch tests to timestamp-based liveness tracking and add timestamp anchoring.
test/PayResolver.t.sol	Switch resolve-deadline logic to timestamps; add tests for not-finalized dependent conditions.
test/PayRegistry.t.sol	Switch finalization checks/tests to timestamp semantics.
test/GasReport.t.sol	Use vm.warp and timestamp-based deadlines in gas measurement harness.
test/CelerLedger.Migrate.t.sol	Update migration deadline tests to timestamps.
test/CelerLedger.ETH.t.sol	Update channel/withdraw/settle deadline tests from block roll to timestamp warp.
test/CelerLedger.ERC20.t.sol	Update settle/confirm timing to timestamps.
src/lib/ledgerlib/LedgerStruct.sol	Document settle/dispute fields as timestamp/seconds-based.
src/lib/ledgerlib/LedgerOperation.sol	Core ledger operations now use block.timestamp for deadlines/timeouts.
src/lib/ledgerlib/LedgerMigrate.sol	Migration deadline enforcement switched to block.timestamp.
src/lib/interface/IRouterRegistry.sol	Update interface docs to timestamp semantics.
src/lib/interface/IPayRegistry.sol	Update interface docs to timestamp semantics.
src/lib/interface/ICelerLedger.sol	Update interface docs for timestamp-based settle/withdraw intent timing.
src/lib/data/proto/entity.proto	Proto formatting/metadata refresh (copyright, ordering, typos).
src/lib/data/proto/chain.proto	Proto formatting/metadata refresh (copyright, ordering, whitespace).
src/lib/data/PbEntity.sol	Regenerated protobuf entity decoders (new decoding approach + helpers).
src/lib/data/PbChain.sol	Regenerated protobuf chain decoders.
src/lib/data/Pb.sol	Regenerated protobuf runtime support library (new primitive decoders).
src/helper/NumericCondMock.sol	Update mock to decode finalization/outcome from query bytes for richer testing.
src/helper/BooleanCondMock.sol	Update mock to decode finalization/outcome from query bytes for richer testing.
src/RouterRegistry.sol	Store router liveness as timestamp instead of block number.
src/PayResolver.sol	Resolve logic now uses timestamps for pay deadlines/timeouts.
src/PayRegistry.sol	Finalization checks now use timestamps.
src/CelerLedgerMock.sol	Keep mock ledger consistent with timestamp-based timing.
docs/contracts.md	Update documentation to describe timestamp-based deadlines and router timestamps.

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