[hmdsefi]

Lands v0.1.0 (Canonical log) on main. Rebase-merge only, never squash: main keeps one commit per task, in this order.

• build: bootstrap the module, root files and CI (build: bootstrap the module, root files and CI #89)
• build: add the pre-commit gate script (build: add the pre-commit gate script #92)
• test(archtest): enforce import, license and apply-path rules (test(archtest): enforce import, license and apply-path rules #93)
• docs: link the roadmap issue from the README (docs: link the roadmap issue from the README #90)
• feat(chain): add chain values, filter, bloom and the Source interface (feat(chain): add chain values, filter, bloom and the Source interface #91)
• feat(chainlog): add log entries and the record codec (feat(chainlog): add log entries and the record codec #94)
• test(fakechain): add the seeded fake chain and source (test(fakechain): add the seeded fake chain and source #96)
• feat(chainlog): add the validator state (feat(chainlog): add the validator state #97)
• feat(wal): add the meta and checkpoint files (feat(wal): add the meta and checkpoint files #99)
• feat(chainlog): add the log interface, conformance suite and in-memory log (feat(chainlog): add the log interface, conformance suite and in-memory log #98)
• feat(wal): add the segmented file log (feat(wal): add the segmented file log #102)
• feat(consumer): add the consumer contract and Run (feat(consumer): add the consumer contract and Run #100)
• feat(tracker): follow new heads, detect reorgs and finalize (feat(tracker): follow new heads, detect reorgs and finalize #101)
• feat(consumer): add the snapshot-and-replay memory consumer (feat(consumer): add the snapshot-and-replay memory consumer #105)
• feat(tracker): cap the unfinalized window (feat(tracker): cap the unfinalized window #103)
• test(invariant): add the reorg invariant property test (test(invariant): add the reorg invariant property test #107)
• feat(wal): recover a torn tail on open (feat(wal): recover a torn tail on open #104)
• feat(wal): compact whole segments below the bound (feat(wal): compact whole segments below the bound #106)

Exit check

• The in-memory log and the file WAL pass the shared log conformance suite (TestMemoryConformance, wal.TestConformance).
• The tracker detects reorgs on the fake chain (TestDepthOneReorg, TestDepthNReorg, TestReorgDuringGapFill).
• The memory consumer passes the reorg invariant property test (TestReorgInvariant).
• scripts/gate.sh passes on f333405.