Add Milestone 7 regression and documentation review (#83)

docs/README.md

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+# Documentation map
+
+Start with the player-facing [project README](../README.md). The two maintained
+technical entry points are [current implementation](CURRENT_IMPLEMENTATION.md)
+and [milestone summaries](MILESTONES.md). Use [GameTest guidance](GAMETESTS.md)
+to run checks. The files below retain detailed design, provenance, and
+version-specific test evidence; an older milestone record may describe a
+former behavior or loader version.
+
+| Milestone | Detailed records |
+| --- | --- |
+| M1–M3 | [Porting roadmap](PORTING.md), [Age administration](AGES.md), [Age profiles](AGE_PROFILES.md), [preview compatibility](PREVIEW_COMPATIBILITY.md), [random Age weights](RANDOM_AGE_WEIGHTS.md) |
+| M4 | [Writing data](WRITING_DATA.md), [book presentation](DESCRIPTIVE_BOOK_PRESENTATION.md), [Ink Mixer audit](INK_MIXER_MODIFIER_AUDIT.md) |
+| M5 | [Acceptance](MILESTONE_5_ACCEPTANCE.md), [Legacy grammar audit](LEGACY_AGE_GRAMMAR_AUDIT.md), [writing grammar](WRITING_GRAMMAR.md), [symbol semantics](SYMBOL_SEMANTICS.md), [TerraBlender](TERRABLENDER_COMPATIBILITY.md), [Serene Seasons](SERENE_SEASONS_COMPATIBILITY.md) |
+| M6 | [Acceptance](MILESTONE_6_ACCEPTANCE.md), [regression](MILESTONE_6_REGRESSION.md), [Legacy audit](LEGACY_INSTABILITY_AUDIT.md), [score](INSTABILITY_SCORE.md), [live blocks](LIVE_BLOCK_INSTABILITY.md), [runtime](INSTABILITY_RUNTIME.md), [diagnostics](INSTABILITY_DIAGNOSTICS.md), [status effects](INSTABILITY_STATUS_EFFECTS.md), [decay](INSTABILITY_DECAY.md), [environmental hazards](INSTABILITY_ENVIRONMENTAL.md), [cloud platform](AGE_CLOUD_PLATFORM.md) |
+| M7 | [Regression and manual matrix](MILESTONE_7_REGRESSION.md), [Legacy audit](LEGACY_M7_AUDIT.md), [visual/audio](MILESTONE_7_VISUAL_AUDIT.md), [advancements](MILESTONE_7_ADVANCEMENTS.md), [JEI](MILESTONE_7_JEI_REVIEW.md), [Serene review](MILESTONE_7_SERENE_REVIEW.md), [compatibility](MILESTONE_7_COMPATIBILITY_REVIEW.md), [Ruins](RUINS_COMPATIBILITY.md) |
+
+[Asset provenance](ASSET_PROVENANCE.md) applies across milestones. Detailed
+audits are intentionally retained for source attribution and migration
+history; these three entry points replace the former practice of treating
+every dated task note as a current installation guide.