/**
 * Read a YAML scalar the way Python's `float()` would — the ONE implementation of that question in
 * the deploy module.
 *
 * Two places need it, for the same reason: the numbers they read are also read on the skills side
 * by Python, and a disagreement means the discovery card and the verb compute different money.
 * `min-budget.ts` uses it as the port of `min_budget.py`'s `_f`; `package.ts` uses it for
 * `funding_share`, which additionally drives `planFunding`'s real allocation. They were briefly two
 * near-copies that had already drifted (one had a boolean branch, the other did not) — which is the
 * drift class this whole workstream exists to close, so they are one function now.
 *
 * SHAPE, NOT LETTER. A number, a bool, or a numeric string parses; everything else is null. Two
 * classes of input where that is not exactly `float()`, both verified, both deliberately left:
 *
 *  - **A blank/whitespace string.** `float("")` raises, `Number("")` is `0`, so the explicit guard
 *    aligns them. Defence in depth: it changes no output today, because every call site rejects `0`
 *    downstream anyway — but that alignment then survives the next edit to any of those guards
 *    instead of holding by accident.
 *  - **Quoted exotic numeric strings**, the only real parity gap across ~450 adversarial inputs, and
 *    reachable ONLY through a quoted YAML scalar (an unquoted `0x14` parses to `20` on both sides
 *    before either implementation sees it). Python accepts more than `Number` in some places
 *    (`"2_5"` → 25.0 under PEP 515, `"Infinity"`/`"inf"` → inf) and less in others (`"0x14"` raises
 *    where `Number` gives 20). Deliberately NOT "fixed" with a numeric-literal regex: that closes
 *    the `0x14` direction while leaving the underscore direction open, trading a documented, tested
 *    divergence for a half-corrected one. Both directions are pinned as tests — in
 *    `min-budget.test.ts` for the sizing path and `package.test.ts` for `funding_share` — so a
 *    future "fix" cannot flip one silently.
 *
 * No shipped package is affected either way: across the 103 catalog packages, zero declare a quoted
 * or non-numeric `funding_share` and zero declare a quoted sizing value.
 */
/** Python `float(x)`, returning null where it would raise. See the module header for the two gaps. */
export declare function pythonFloat(value: unknown): number | null;
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