feat(rust): karst-derive inlined derivation pipeline

[theochap]

Summary

• Adds kona-karst-derive, a flat, inlined OP Stack derivation pipeline that replaces the staged kona-derive architecture
• Single Pipeline struct holds all intermediate state as fields; all derivation steps are direct method calls (no trait-based stage composition)
• Only supports Holocene+, removing all hardfork branching: always uses channel assembler, batch validator, Fjord size limits, and Holocene frame pruning
• Re-exports traits and error types from kona-derive for compatibility

Key simplifications vs kona-derive

kona-derive	karst-derive
ChannelProvider mux (bank vs assembler)	Always assembler (inline)
BatchProvider mux (queue vs validator)	Always validator (inline)
BatchStream.is_active() guard	Always active
FrameQueue conditional Holocene pruning	Always prune
Fjord vs Bedrock MAX_RLP_BYTES_PER_CHANNEL	Always Fjord (100_000_000)
Recursive signal-based reset	Single flat reset() method

Test plan

• cargo check -p kona-karst-derive compiles
• cargo clippy -p kona-karst-derive passes with zero warnings
• Port key unit tests from kona-derive stages
• Integration testing with rollup node

🤖 Generated with Claude Code

[wiz-inc-a178a98b5d]

Wiz Scan Summary

Scanner	Findings
Vulnerabilities	4  1  2
Sensitive Data	-
Secrets	-
IaC Misconfigurations	-
SAST Findings	-
Software Management Findings	-
Total	4  1  2

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 453 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.8%. Comparing base (86f1d29) to head (d91fa2a).

Files with missing lines	Patch %	Lines
...ust/kona/crates/protocol/karst-derive/src/batch.rs	0.0%	139 Missing ⚠️
.../kona/crates/protocol/karst-derive/src/pipeline.rs	0.0%	79 Missing ⚠️
...st/kona/crates/protocol/karst-derive/src/frames.rs	0.0%	70 Missing ⚠️
...t/kona/crates/protocol/karst-derive/src/channel.rs	0.0%	52 Missing ⚠️
...ona/crates/protocol/karst-derive/src/attributes.rs	0.0%	42 Missing ⚠️
...kona/crates/protocol/karst-derive/src/traversal.rs	0.0%	41 Missing ⚠️
...st/kona/crates/protocol/karst-derive/src/reader.rs	0.0%	30 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #19487      +/-   ##
===========================================
+ Coverage     75.3%    75.8%    +0.4%     
===========================================
  Files          194      623     +429     
  Lines        11285    67630   +56345     
===========================================
+ Hits          8502    51269   +42767     
- Misses        2639    16361   +13722     
+ Partials       144        0     -144     

Flag	Coverage Δ
cannon-go-tests-64	?
contracts-bedrock-tests	80.2% <ø> (ø)
unit	75.2% <0.0%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...st/kona/crates/protocol/karst-derive/src/reader.rs	0.0% <0.0%> (ø)
...kona/crates/protocol/karst-derive/src/traversal.rs	0.0% <0.0%> (ø)
...ona/crates/protocol/karst-derive/src/attributes.rs	0.0% <0.0%> (ø)
...t/kona/crates/protocol/karst-derive/src/channel.rs	0.0% <0.0%> (ø)
...st/kona/crates/protocol/karst-derive/src/frames.rs	0.0% <0.0%> (ø)
.../kona/crates/protocol/karst-derive/src/pipeline.rs	0.0% <0.0%> (ø)
...ust/kona/crates/protocol/karst-derive/src/batch.rs	0.0% <0.0%> (ø)

... and 532 files with indirect coverage changes

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