docs: record local BPHS method evidence

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+# Local BPHS Method Source Audit
+
+## Source boundary
+
+The inspected copy is a locally held Chinese BPHS reading note. It is a
+non-redistributable method source, not a licensed replacement for a published
+critical edition. This audit records page labels and derived verification scope,
+not book text or page images.
+
+## Shadbala
+
+| Local page label | Verifiable content | Permitted use |
+| --- | --- | --- |
+| 66 | Six components: Sthana, Dik, Kala, Chesta, Naisargika, Drik; seven classical planets only; 60 Virupa = 1 Rupa. | Component schema and unit contract. |
+| 66–71 | Subcomponent grouping and Dik Bala calculation convention. | Method-variant attribution. |
+| 72 | Planet-specific total and component Virupa strength thresholds. | Threshold provenance only. |
+
+The pages contain formula/threshold material, but no single native chart with
+birth input and all six computed component values. They cannot adjudicate the
+existing 42 Shadbala component mismatches by themselves.
+
+## Ashtakavarga
+
+| Local page label | Verifiable content | Permitted use |
+| --- | --- | --- |
+| 271 | Ashtakavarga scope: seven planets plus Lagna. | Input-surface contract. |
+| 272–276 | Planet-to-reference-house Bindu matrices. | BAV matrix method comparison. |
+| 278 | Bindu/Rekha terminology and explicit note that other books use different allocations. | Parallel-method disclosure. |
+
+The pages provide a matrix definition, not a complete birth input plus BAV/SAV
+output table. They can isolate an allocation-table disagreement but do not make
+one engine the numeric truth oracle.
+
+## Related local sources
+
+- B.V. Raman, *How to Judge a Horoscope*, Vols. 1–2: many numbered natal
+  examples with birth data and Dasha balances; the inspected Vol. 2 index
+  defines Shadbalas but does not provide a component worked table.
+- K.N. Rao, James Braha, Marc Boney, V.P. Goel, BPHS and Brihat Jataka sources
+  are present in the local Jyotish library and remain candidates for further
+  page-level review.
+
+## Status
+
+`method_evidence_available_not_numeric_worked_example`
+
+Next acceptance target: a source page that contains the chart input, declared
+ayanamsa/node convention, and all target Shadbala or BAV/SAV values.