init: lib-core.api-discovery v0.1.0 skeleton

Empty M-table. Functions added incrementally via TDD in subsequent
S2-plan tasks.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

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+build/
+*.log

README.md

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+# lib-core.api-discovery
+
+Pure-Lua-Library for surface-discovery (extract `M.*` from Lua source) and README-parsing (extract documented API from markdown). Sandbox-safe — no FS, no side-effects. Used by Sporel's `--lint` CLI mode.
+
+Version: 0.1.0

init.lua

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+-- lib-core.api-discovery — Pure-Lua surface-discovery + README-parsing.
+-- See: meta/docs/superpowers/specs/2026-05-16-api-doc-convention-design.md
+local M = {}
+
+return M

manifest.lib

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+{"id":"lib-core.api-discovery","version":"0.1.0","api_min":"0.1"}