STR 2573 Separate generate block template and get block template

[krsnapaudel]

Description

Decouples block template generation from duty extraction.

What Changed

• Added a dedicated GenerationTick path in the sequencer (separate from duty Tick).
• Wired generation cadence to sequencer.ol_block_time_ms (ol_block_interval), while keeping duty polling on --duty-poll-interval.
• Added SequencerContext::generate_template_for_tip() and implemented it in the node context.
• Added TemplateGeneration error variant to SequencerContextError.
• Updated duty extraction to be read-only:
  • Uses get_block_template(parent) only.
  • If no template exists, block duty is skipped (not an error).
• Removed GetOrGenerateBlockTemplate from block-assembly:
  • Command variant
  • Handle method
  • Service match arm and function
• Added generation-path observability logs (tick fired, tip-change detection, generation attempt/config/result).

Behavior Change

• Template generation is now periodic and background-driven.
• Duty extraction no longer triggers template generation.

Two functional tests relying on epoch progression had small timeouts. Updated to make them pass.

This PR was created with help from Codex and Claude Code.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature/Enhancement (non-breaking change which adds functionality or enhances an existing one)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactor
• New or updated tests
• Dependency Update

Notes to Reviewers

Is this PR addressing any specification, design doc or external reference document?

• Yes
• No

If yes, please add relevant links:

Checklist

• I have performed a self-review of my code.
• I have commented my code where necessary.
• I have updated the documentation if needed.
• My changes do not introduce new warnings.
• I have added (where necessary) tests that prove my changes are effective or that my feature works.
• New and existing tests pass with my changes.
• I have disclosed my use of AI in the body of this PR.

Related Issues

STR-2573

[github-actions]

Commit: c037c47

SP1 Execution Results

program	cycles	success
EVM EE STF	1,320,914	✅
Checkpoint	5,226	✅
Checkpoint New	883,623	✅

[codecov]

Codecov Report

❌ Patch coverage is 1.72414% with 57 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.04%. Comparing base (4f8f41c) to head (f76d7dd).
⚠️ Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/ol/sequencer/src/service.rs	5.00%	19 Missing ⚠️
crates/ol/sequencer/src/builder.rs	0.00%	9 Missing ⚠️
bin/strata/src/sequencer/node_context.rs	0.00%	8 Missing ⚠️
bin/strata/src/sequencer/signer.rs	0.00%	8 Missing ⚠️
crates/ol/sequencer/src/extraction.rs	0.00%	7 Missing ⚠️
crates/ol/sequencer/src/input.rs	0.00%	6 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (4f8f41c) and HEAD (f76d7dd). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (4f8f41c)	HEAD (f76d7dd)
unit	2	1
functional	1	0

@@            Coverage Diff             @@
##             main    #1490      +/-   ##
==========================================
- Coverage   74.33%   65.04%   -9.29%     
==========================================
  Files         783      781       -2     
  Lines       73713    73470     -243     
==========================================
- Hits        54795    47791    -7004     
- Misses      18918    25679    +6761     

Flag	Coverage Δ
functional	?
unit	65.04% <1.72%> (+0.14%)	⬆️

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

Files with missing lines	Coverage Δ
crates/ol/block-assembly/src/command.rs	100.00% <ø> (ø)
crates/ol/block-assembly/src/handle.rs	0.00% <ø> (-67.17%)	⬇️
crates/ol/block-assembly/src/service.rs	55.72% <ø> (-39.02%)	⬇️
crates/ol/block-assembly/src/state.rs	91.50% <ø> (-3.09%)	⬇️
crates/ol/sequencer/src/input.rs	0.00% <0.00%> (-100.00%)	⬇️
crates/ol/sequencer/src/extraction.rs	0.00% <0.00%> (-97.73%)	⬇️
bin/strata/src/sequencer/node_context.rs	0.00% <0.00%> (-82.98%)	⬇️
bin/strata/src/sequencer/signer.rs	0.00% <0.00%> (-91.43%)	⬇️
crates/ol/sequencer/src/builder.rs	0.00% <0.00%> (-100.00%)	⬇️
crates/ol/sequencer/src/service.rs	64.33% <5.00%> (-26.65%)	⬇️

... and 236 files with indirect coverage changes

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[krsnapaudel]

@purusang Added you so you are aware of changes here.

[storopoli]

ACK f76d7dd