feat: add pitch pallet

pallets/pitch/Cargo.toml

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+[package]
+authors.workspace = true
+description = "Ephemeral, consent-gated economic cells keyed by H3 cell references"
+edition.workspace = true
+license.workspace = true
+name = "fc-pallet-pitch"
+repository.workspace = true
+version = "0.1.0"
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
+
+[dependencies]
+codec.workspace = true
+frame.workspace = true
+scale-info.workspace = true
+sp-runtime.workspace = true
+
+[dev-dependencies]
+pallet-balances.workspace = true
+sp-io.workspace = true
+
+[features]
+default = ["std"]
+runtime-benchmarks = [
+	"frame/runtime-benchmarks",
+	"pallet-balances/runtime-benchmarks",
+	"sp-runtime/runtime-benchmarks",
+]
+std = [
+	"codec/std",
+	"frame/std",
+	"pallet-balances/std",
+	"scale-info/std",
+	"sp-io/std",
+	"sp-runtime/std",
+]
+try-runtime = [
+	"frame/try-runtime",
+	"pallet-balances/try-runtime",
+	"sp-runtime/try-runtime",
+]

pallets/pitch/README.md

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+# Pitch Pallet
+
+`fc-pallet-pitch` records time-boxed economic authority over H3 cells.
+
+A pitch is a short-lived claim over the economic membrane of a place: it can be
+publicly indexed by raw H3 cell, hidden behind a commitment, gated by a
+membership proof, or sealed with only an opaque on-chain residue. The pallet
+does not perform H3 geometry. Clients compute H3 cells off-chain and submit
+either the raw `u64` cell or a commitment.
+
+This first implementation focuses on the minimal consensus surface:
+
+- claim, amend, join, dissolve, and reap a pitch;
+- index public raw-cell pitches for cheap lookup;
+- keep private pitches out of the raw-cell index;
+- record selective disclosure grants without putting the disclosed secret
+  on-chain;
+- derive a deterministic sovereign account for each pitch.
+
+Fee routing, VOS/Noir verification, and off-chain residue transport are intended
+as runtime integrations layered on top of this base.