Template new entrant regional granularity

[EllieKallmier]

Adds functionality to collapse (aggregate) new entrant technologies to the model config's regional_granularity.

Changes live here:

src/ispypsa/templater/
├── new_entrants.py              ← _collapse_geo_id_to_granularity + orchestrators calling it as their final step
├── create_template.py           ← generators/storage_new_entrant + costs_connection now real template outputs
├── geography.py                 ← _build_geo_region_lookup, deduplicated here
└── transmission.py              ← ...(from here), now imports from geography.py

src/ispypsa/validation/schemas/
├── generators_new_entrant.yaml  ← drops fuel_price_mapping (see below) + LCF source table fix
└── storage_new_entrant.yaml     ← same LCF source table fix

src/ispypsa/iasr_table_caching/local_cache.py
                                 ← registers technology_specific_lcfs/locational_cost_factors (missed in prev PR)

Notes

• The "WOO" duplicate sub-region option is an explicit named case. Real 7.5 data has one duplicate build option per sub-region for four gas technologies (e.g. "WOO OCGT Small" alongside "CNSW OCGT Small"). Rather than a
  weighted average that implicitly compensates for this, it drops the known rows by name and _assert_no_unexpected_duplicate_options raises on any other repeat (unexpected). Documented in comments on new_entrants_summary v7.5/7.8: NSA pumped-hydro rows have mismatched Regional build cost zone (CSA instead of NSA) [+workbook weirdness] #131.
• fuel_price_mapping dropped from generators_new_entrant entirely, rather than carried through the collapse. It's not needed until fuel price templating exists - plan is to match fuel prices via geo_id +technology against a redesigned costs_fuel_prices table, now made easier/a more viable option with the planned wild-card schema thing. Two schemas will need matching updates when that happens: costs_fuel_prices.yaml and generators_existing_planned.yaml.
• Merged rows are named "{geo_id} {technology}", except BOTN - Cethana, which keeps its real name.

Follow-ups for later

• costs_fuel_prices.yaml / generators_existing_planned.yaml fuel-price-mapping rework (might also rely a bit on Translate the new-format network tables to buses and links #126 and the wildcard handling to properly settle this)
• Pre-existing gap, not fixed here: N0/V0 ("Non-REZ" IDs for NSW/VIC) are used as geo_id but never appear in renewable_energy_zones, so they're absent from network_geography at every granularity — tracked as Non-REZ IDs N0/V0 not templated in network_geography #133, set out as a known exception in the CLI test.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/ispypsa/iasr_table_caching/local_cache.py	74.28% <ø> (ø)
src/ispypsa/templater/create_template.py	93.02% <100.00%> (ø)
src/ispypsa/templater/geography.py	94.73% <100.00%> (+0.79%)	⬆️
src/ispypsa/templater/new_entrants.py	100.00% <100.00%> (ø)
src/ispypsa/templater/transmission.py	98.80% <100.00%> (-0.03%)	⬇️

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