docs: define the living galaxy vision

[colorpulse6]

Summary

• defines the frontier-captain fantasy and Captain's Circuit session backbone
• establishes generational population, persistent households, emergent Great Houses, layered galactic time, delegation, and the historical chronicle
• preserves Sector Zero as an uncharted frontier whose ruins are a graveyard of human futures while leaving the tear's ultimate cause permanently unresolved
• turns campaign completion into the Long Search, with a forever sandbox or a voluntary Fold branch
• defines slow Fold metamorphosis, defense against the next human cycle, and perspective succession only after a true playable defeat
• preserves individual identity within a limited shared-memory layer and distinguishes Fold connection from the Hollow Mind's pathological collapse
• specifies contextual resonance prompts, progressive interface metamorphosis, recognizable character mutation, provenance, accessibility, and determinism guardrails

Why

These decisions provide a durable north star for M3-M6 and later eras without pulling long-horizon systems into the active roadmap prematurely. They keep future colony, population, quest, UI, and save-data foundations compatible with the same living-galaxy direction.

Verification

• independent spec-review passes completed for the temporal-frontier, Fold-era, consciousness/cosmology, and interface/mutation slices
• git diff --check origin/main...HEAD
• branch verified as current with origin/main before push (12 branch-only commits, 0 missing main commits)
• docs-only change; no runtime code or assets modified

Notes

The document remains explicitly IN DISCUSSION and includes an open-decision ledger. It extends the roadmap but does not reorder active milestones or authorize immediate post-M6 implementation.

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