Add Microlensing pipeline (v1.0.0) — new top-level tab alongside Transit

[eagnespuerto]

Splits the header into Transit / Microlensing tabs. The Microlensing pipeline contains two independent tools:

Module A: Model-comparison classifier

• POST /api/microlensing/fit fits PSPL (Paczynski closed form, blended), Davenport-2014 flare template, and null models to a user-flagged window.
• BIC-based verdict rules per spec (delta_bic > 10 = strong, |delta| < 6 = ambiguous), symmetry statistic, per-model residuals.
• MulensModel parity test locks the closed-form PSPL to the reference implementation to < 1e-12.
• Frontend: MicrolensingClassifier.tsx — data loader (JSON/CSV upload or synthetic PSPL/flare demo), SVG drag-select, 3-model overlay, verdict badge, BIC bar, PSPL params + 1sigma errors, residuals sub-plot.

Module B: TESS sector-overlap targeting

• POST /api/microlensing/coverage takes a CSV of event_id,ra,dec,t0,tE and returns per-event sector coverage.
• tess_sector_dates.py sources per-sector midtimes from tess-point's bundled TESS_Spacecraft_Pointing_Data (121 sectors, all calendar-anchored); anchor-formula fallback if tess-point missing.
• Bulge / ecliptic blind-zone flag (|ecl lat| < 6 deg) surfaced with a prominent UI caveat.
• Frontend: MicrolensingCoverage.tsx — CSV upload, sortable/observable-only table, sector pills with tooltips, Analyze row action.

Coverage → Classifier handoff

• POST /api/microlensing/lightcurve_by_coords resolves RA/Dec to nearest TIC via MAST Catalogs, walks available sectors newest-first (preferring SPOC/TESS-SPOC/QLP over DVT-only), returns raw arrays plus TIC + provider
  • separation metadata.
• Classifier's prefill banner offers a Fetch TESS light curve button that autoloads the LC into the classifier, with window auto-selected around t0 +/- 2 tE. MAST portal link kept as fallback.

Export + share

• Share plot button rasterises the SVG (light curve + fit overlay) to PNG in-browser and uploads to ImgBB via the existing ShareToImgbbButton.
• Download ExoFOP package button assembles a store-only ZIP with summary.csv (verdict, PSPL params, BICs, symmetry), lightcurve_windowed.csv (data + per-model curves on the same grid), notes.md, fit_full.json, and the plot PNG. Filename derived from event id + TIC + sector.

Tests

• 23 microlensing tests (10 fit + 13 coverage) covering PSPL/flare/null recovery, symmetry, CSV parsing, sector lookup, and the bulge-zone flag.
• MulensModel parity test skips cleanly when MulensModel isn't installed.

Docs

• README.md rewritten to describe the split, both modules, all four endpoints, and the new export/share buttons; project layout updated.
• docs/SCIENCE.md gains sections 15 (Module A: PSPL magnification math, Davenport template, BIC selection, symmetry statistic) and 16 (Module B: tess-point coordinate resolution, calendar-anchored windows, observability + wings margin, bulge blind zone).

Version bumped 0.2.0 -> 1.0.0.