feat: switch block stream and TSS configs defaults for 0.77

[petreze]

Summary

Final step of the block-stream cutover (#25892): flip the production defaults so the consensus node produces blocks, signs them with real TSS signatures, and streams them over gRPC to a Block Node by default — retiring the legacy record stream and the dual file/gRPC write.

Production changes

Config defaults (hedera-config):

Property	Old	New
blockStream.streamMode	BOTH	BLOCKS
blockStream.writerMode	FILE_AND_GRPC	GRPC
blockStream.enableCutover	false	true
blockStream.streamWrappedRecordBlocks	true	false
blockStream.buffer.isBufferPersistenceEnabled	false	true
tss.forceMockSignatures	true	false

• BlockRecordService: supporting adjustment for sourcing block/running-hash info in BLOCKS mode.
• configuration/dev: aligned to the new defaults (BLOCKS; WRAPS proving-key download disabled).

Test harness & CI

• Subprocess harness now starts a real Block Node from the effective writerMode/streamMode (the new default), not just explicit overrides (SharedNetworkLauncherSessionListener) — so every subprocess HAPI job that implies streaming gets a live (DinD) Block Node.
• Block-source abstraction (BlockSource / BlockNodeBlockSource / FileSystemBlockSource / BlockSourceFactory) + StreamValidationOp read blocks back from the Block Node and run the data-independent validators in BLOCKS mode; freeze-block-aware gating and "settle before replay" for the gRPC read-back.
• Embedded/repeatable pinned to writerMode=FILE (no in-process Docker; backpressure stays off while still exercising true BLOCKS semantics with a file sink).
• CI: HAPI jobs run on Block-node-capable runners (805-call-execute-hapi-tests.yaml, build.gradle.kts); transition scaffolding removed.
• Misc BLOCKS/gRPC test fixes: ContractCreateTranslator hex guard, deterministic sidecar extraction (SidecarWatcher), block-stream assertions, genesis/subprocess suites.

Related issue(s):

Fixes #25892

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

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[lfdt-bot]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@             Coverage Diff              @@
##               main   #25928      +/-   ##
============================================
- Coverage     70.51%   70.30%   -0.22%     
+ Complexity    11883    11876       -7     
============================================
  Files          2626     2626              
  Lines        109705   109706       +1     
  Branches      12072    12071       -1     
============================================
- Hits          77363    77131     -232     
- Misses        28374    28610     +236     
+ Partials       3968     3965       -3     

Files with missing lines	Coverage Δ	Complexity Δ
...om/hedera/node/app/records/BlockRecordService.java	100.00% <100.00%> (ø)	0.00 <0.00> (ø)
...com/hedera/node/config/data/BlockBufferConfig.java	100.00% <ø> (ø)	0.00 <0.00> (ø)
...com/hedera/node/config/data/BlockStreamConfig.java	100.00% <ø> (ø)	0.00 <0.00> (ø)
...in/java/com/hedera/node/config/data/TssConfig.java	100.00% <ø> (ø)	0.00 <0.00> (ø)

... and 29 files with indirect coverage changes

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[testlens-app]

✅ All tests passed ✅

🏷️ Commit: e439872
▶️ Tests: 6893 executed
⚪️ Checks: 52/52 completed

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