docs: compose WorldState and GeoTask public portal

[stpku]

Goal

Reframe the GeoTask GitHub Pages root as a shared public entry for WorldState + GeoTask without merging repository or semantic ownership.

Public story

Reality → WorldState → GeoTask → Agent

• WorldState: what is true, unknown, conflicted, valid, stale, or changed about the world.
• GeoTask: what the current task needs to know, whether context is applicable/resolution-adequate/sufficient, and how to minimize context cost.

Changes

• make the first-screen story primarily Chinese and reduce generic Chinese/English mixing;
• retain canonical API/object names where they carry engineering meaning;
• add explicit WorldState and GeoTask foundation cards and independence boundaries;
• add independent consumer proofs for Warehouse Robot Picking and WorldState cold-chain state;
• keep GT01–GT42 routes as a historical archive rather than moving the whole series into WorldState;
• add three recommended historical learning paths;
• add a visible ★ GitHub navigation CTA and ★ Star GeoTask closing CTA without displaying a potentially misleading star count;
• preserve the current Task Context Engine invariants, all 42 case routes, SEO metadata, and static/no-network portal behavior;
• add a focused regression test freezing the combined-portal boundary.

Non-goals

• no repository merge;
• no WorldState code change;
• no GT route migration;
• no production/runtime semantic change;
• no merge or Pages publication in this PR step.

Review focus

1. Does one public story improve first-time comprehension without making WorldState look like a GeoTask submodule?
2. Is the Chinese surface natural enough while preserving canonical technical names?
3. Does the historical-case treatment correctly preserve provenance without carrying legacy positioning into the hero narrative?
4. Is the Star CTA visible but not intrusive?

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[stpku]

Final visual / Fresh Eyes gate

Verdict: PASS_WITH_MOBILE_STAR_ATTENTION

Validated on exact candidate 5a28ce9b07ae47a8189a9172724281228e058a67 after full CI success.

• Desktop first-screen comprehension: PASS — the page explains Reality → WorldState → GeoTask → Agent without merging semantic ownership.
• Chinese/English narrative parity: PASS.
• WorldState truth boundary: PASS — state is evidence/validity/unknown/conflict aware rather than presented as an unconditional truth oracle.
• GeoTask Task Context identity: PASS.
• GT01–GT42 historical treatment: PASS — curated learning paths first, full generated catalog preserved and collapsed.
• P1 Reference Agent compatibility entry: PASS.
• Desktop GitHub Star CTA: PASS.
• Mobile hierarchy / one-column flow: PASS.
• Attention: at max-width:760px, .links{display:none} also hides the header ★ GitHub CTA. The closing-page Star CTA remains available, but the requested top-right Star affordance is not visible on mobile.

No further portal content changes are included in this review. Do not merge/publish solely on this comment; mobile Star visibility should be treated as the only remaining visual polish decision.