feat(atlas,realm): ship canonical Greater Realm pipeline and next-gen grass

[ael-dev3]

Summary

Ships the private deterministic pipeline for one canonical Greater Realm world and the production-ready Realm vegetation presentation requested from the three-stylized study.

Canonical Greater Realm foundation

• Generates one organic 100k–150k-cell continent with bounded terrain, hydrology, climate, ecology, strategic, living-world, package, replay, and owner-review authority.
• Keeps private package fields dormant and owner-only while binding them into stage/final/package/chunk digests, tamper detection, exact field validation, and cleanup.
• Current identities are generator greater-realm-v2-natural-continent-pr-a.17, terrain seed namespace .3, living-world authority v4, and private atlas format 8.
• Hardens generated-water component traversal so typed search scratch and temporary coordinate lists are retired on success and failure without changing the pinned candidate bytes.
• Pins the known eligible ordinal-9 final digest in the candidate-generator suite.

Next-generation Realm vegetation

• Adds true stable near/mid geometry LOD: segmented hero blades near the camera and genuinely lower-topology one-triangle mid blades.
• Uses a deterministic one-of-two stochastic handoff for shared roots, eliminating the overlapping alpha masks and density dip that ordinary near/mid alpha blending caused.
• Enforces explicit High/Balanced/Reduced instance, triangle, cache, flower, upload, and aggregate draw ceilings; grass draw caps are 6 / 4 / 2.
• Uses fixed-capacity camera-local pools, dynamic repack uploads, recomputed wind-safe bounds, and enabled per-pool frustum culling.
• Upgrades the Three r185 grass and flower shaders with analytic bend-following normals; grass retains root-to-tip grading and restrained view/sun thin-blade transmission.
• Adds far-band vegetation tint, roughness, and derivative-filtered normal relief to the terrain material.
• Uses exactly one opaque stochastic coverage path: alpha-to-coverage under MSAA, alpha hashing otherwise. It never double-applies coverage.
• Detects shader-marker drift and renderer-level GLSL compile/link failure. Grass falls back to credible static standard material; optional flowers discard the triggering frame and hide fail-closed with zero draw telemetry.
• Adds a separate deterministic near-detail wildflower layer derived only from accepted grass/ecology roots: one bounded draw, 512 High / 256 Balanced / 0 Reduced instances, shared wind clock, independent placement channels, and no raycast or shadow path.
• Validates the complete linked attribute layout, every count/byte multiplication, each dynamic buffer, and per-profile repack ceilings before any vegetation allocation. Unsupported plans downshift atomically to a proven lower profile or terrain-only.
• Makes grass, flower, geometry, mesh, and material construction failure-atomic; partial GPU resources are disposed before errors escape.
• Enforces the advertised 24 / 16 / 0 Hz grass wind-update ceilings while preserving reduced motion, exclusions, visibility policy, deterministic replay, and coordinate-free telemetry.
• Extends the authoritative rendered-WebGL DOM/probe contract to validate true near/mid topology, flowers, coverage-mode exclusivity, shader fallback, overview zeroing, capability attestation, and every quality ceiling.

Provenance

The grass direction was informed by three-stylized at commit 3275628 and its credited stylized-components source at commit b182d81, both MIT-licensed. This is a clean-room implementation: no third-party source, shader, geometry, texture, asset, test, or tuning constant was copied.

Scope guard

• This does not activate the private Greater Realm package in the client, stream private package fields, publish a SpacetimeDB revision, expose seeds/coordinates/review images, deploy Pages, or change the custom domain.
• The vegetation upgrade applies to the existing public Lowlands/general Realm renderer. Greater Realm runtime activation remains a separate reviewed release step.
• Grass and flowers intentionally neither cast nor receive shadow maps until a parity-proven animated color/depth/distance shadow path exists.
• Optional WebGPU/TSL remains deferred; Three's experimental WebGPU renderer does not support this production onBeforeCompile path, so WebGLRenderer/GLSL remains the fail-closed baseline.

Validation

Green on pushed commit d9c1732:

• Candidate generator: 21/21, including exact eligible ordinal-9 final-digest replay.
• Complete affected grass/flower/terrain/scene/capability/browser-probe set: 179/179 across 10 files.
• TypeScript project build and production Vite bundle passed (1,857 modules).
• License policy, exact runtime assets, all Hegemony runtime asset families, tracked file-size policy, production-dist exclusions, Greater Realm public boundary (1,381 tracked paths / 958 scanned entries after build), and Farcaster Mini App integrity passed.
• Deterministic canonical Genesis grass digest passed twice after the exclusive LOD handoff update.
• In-app rendered WebGL inspection on the final source produced no browser warnings/errors and no grass/flower shader fallback:
  • High: 1,004 near + 691 mid grass instances, 30,563 triangles, 6 draws, 126/512 flowers, A2C-only.
  • Balanced: 417 near + 259 mid, 9,793 triangles, 4 draws, 61/256 flowers, A2C-only.
  • Reduced: 66 near + 35 mid, 1,095 triangles, 2 draws, zero flower geometry, alpha-hash-only, frozen wind.
  • All three reported preferred, the expected selected profile, and maxAttributes = 16.
• Full-repository serial run outside the restricted sandbox: 301/303 files, 3,574 tests passed, 79 skipped. The only unavailable files are the private Greater Realm package/toolchain attestation suites: this host exposes Node 24 while the security boundary locks Node 22 plus exact executable-package-tree digests. Those checks failed closed; no product or vegetation test failed.
• The locked external Chrome probe also failed closed before launch because /Applications/Google Chrome.app is not installed. The in-app Chromium evidence above exercised the final WebGL scene and shader programs instead; the probe's executable attestation was not weakened.
• git diff --check passed and the worktree was clean after commit.

This PR remains draft; it is not authorized for merge by this update.

[ael-dev3]

The #193 lineage is now contained in protected main through audited merge 98a3636. Reopening this integration record intentionally so it remains the final PR resolved only after the staged Greater Realm rollout and live receipts complete; do not merge its stale branch separately.