feat(docs): add wiki stub system for 300 star systems

Generated wiki stubs at docs/wiki/systems/{GJ-id}/index.md for all
300 systems. Each stub has YAML frontmatter (54 machine-readable
columns) + markdown body (5 authored text sections) + derived fields.

13 columns pre-filled from star-map.json (identity, gate infrastructure,
location, wave, earth_proximity). 55 columns await authoring.

Includes:
- tooling/wiki/generate-stubs.py — template renderer, idempotent
- tooling/wiki/extract-csv.py — wiki→CSV extractor with fill rate report
- docs/design/star-systems.csv — initial CSV at 19.3% completion

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/wiki/systems/GJ-1069/index.md

@@ -0,0 +1,119 @@
+---
+# ============================================================
+# GJ 1069 — PLACEHOLDER_298
+# Star Systems Wiki — The Settled Reach
+# ============================================================
+# Auto-generated stub. Pre-filled fields from star-map.json.
+# Fields marked ~ require authoring.
+# ============================================================
+
+# I. Identity and Location
+system_id: S-298
+astronomical_id: "GJ 1069"
+proper_name: ~
+system_name: "PLACEHOLDER_298"
+star_type: M
+geographic_sector: east_reach
+geographic_band: inner
+political_zone: institutional_core
+
+# II. Physical Character
+habitable_planet_count: ~
+inhabited_planet_count: ~
+asteroid_belt: ~
+gas_giant: ~
+habitability_profile: ~
+
+# III. Gate Infrastructure
+horizon_station: true
+aperture_count: 3
+gate_connections: 3
+gate_topology: junction
+span_gate_network: ~
+
+# IV. Settlement History
+settlement_wave: wave_2
+founding_motivation: ~
+founding_culture_primary: ~
+founding_culture_secondary: ~
+cultural_persistence: ~
+historical_event: ~
+historical_event_age_years: ~
+religious_status: ~
+religious_generation_count: ~
+
+# V. Economic Life
+economic_tier: ~
+population: ~
+economic_base_primary: ~
+economic_base_secondary: ~
+distribution_index: ~
+imprint_access: ~
+
+# VI. Governance
+governance_type: ~
+dominant_faction: ~
+primary_fault_line: ~
+secondary_fault_line: ~
+
+# VII. Faction Presence
+assembly_presence: ~
+commission_presence: ~
+syndic_presence: ~
+syndic_type: ~
+separatist_presence: ~
+separatist_type: ~
+institute_presence: ~
+guardians_presence: ~
+
+# VIII. Cultural Voice
+cultural_register: ~
+cultural_register_secondary: ~
+ambient_anxiety: ~
+local_pride: ~
+atmospheric_tone: ~
+atmospheric_tone_secondary: ~
+active_situation: ~
+silence_threshold: ~
+
+# IX. Political Character
+earth_alignment: ~
+earth_proximity: proximate
+earth_tension: ~
+
+# X. Narrative Profile
+primary_archetype: ~
+secondary_archetype: ~
+narrative_notable: ~
+generation_priority: ~
+
+# XI. Content Notes
+stability_index: ~
+system_volatility: ~
+cultural_corridor: ~
+---
+
+# PLACEHOLDER_298
+**GJ 1069** | S-298 | M-type | east_reach inner
+
+## Supply Dependency
+<!-- Required for manufacturing/transit_logistics base and narrative_notable systems -->
+
+## Faction Notes
+<!-- Significant local factions not covered by standard columns -->
+
+## Silence Topic
+<!-- Required for narrative_notable and Institutional Core / Diplomatic Periphery zones -->
+
+## Narrative Hook
+<!-- Required if narrative_notable = true. One sentence. -->
+
+## Calibration Note
+<!-- Unusual column combinations requiring justification -->
+
+## Derived Fields
+<!-- Auto-generated from star-map.json, do not edit manually -->
+- **Compound Zone:** east_reach / inner / institutional_core
+- **Settlement Age:** ~400 years
+- **Hop Distance from Gateway:** 5
+- **Adjacent Systems:** S-021, S-228, S-236