refactor(rivetkit): collapse unpublished internal schema

[NathanFlurry]

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[NathanFlurry]

Stack for rivet-dev/rivet

• #5452 refactor(rivetkit): expose schedule intervals as durations
• #5450 perf(rivetkit): index named queue reads
• #5449 refactor(rivetkit): use unitless schedule duration names
• #5451 perf(rivetkit): bound queue reads and history pruning
• #5448 refactor(rivetkit): collapse unpublished internal schema 👈
• #5446 refactor(rivetkit): centralize internal sqlite storage
• #5445 test(rivetkit): simplify sqlite efficiency coverage
• #5443 perf(rivetkit): verify and optimize internal sqlite queries
• #5427 fix(rivetkit): clean up cron history efficiently
• #5439 docs(rivetkit): remove redundant overdue schedule note
• #5440 docs(rivetkit): use scheduling code snippets
• #5442 fix(rivetkit): configure inspector protocol versions
• #5441 feat(rivetkit): add actor scheduling
• main

Get stack: forklift get 5448
Push local edits: forklift submit
Merge when ready: forklift merge 5448

_{change yyvpxlzm}