test: integration coverage for untested extrinsics across 8 pallets

[mrq1911]

Adds full-runtime integration coverage for extrinsics that were exercised only at the pallet level. Gaps were identified from the runtime interaction graph's prioritized_test_gaps pack (entrypoints with no static integration-test link) and each was confirmed to have zero references in integration-tests/src/ before writing.

84 new tests across 8 new modules:

• stableswap_extra (8) — buy, remove_liquidity, withdraw_asset_amount, update_amplification, update_asset_peg_source, update_pool_max_peg_update
• xyk_extra (5) — add_liquidity_with_limits, remove_liquidity_with_limits (slippage guards) + a create_pool orphan-state regression (asserts the executive's storage layer rolls back a partial create)
• omnipool_extra (7) — remove_liquidity_with_limit, refund_refused_asset (all four error branches)
• hsm_admin_extra (4) — update_collateral_asset, remove_collateral_asset (snapshot-fork based)
• liquidity_mining_extra (15) — omnipool + xyk yield-farm lifecycle: stop/resume/update/terminate_yield_farm, terminate_global_farm, update_global_farm
• signet (19) — full pallet: set_config, pause/unpause, sign, sign_bidirectional, withdraw_funds, respond/respond_error/respond_bidirectional
• amm_misc_extra (8) — bonds::redeem, lbp::add_liquidity/remove_liquidity, currencies::transfer_native_currency
• admin_misc_extra (18) — dispatcher::dispatch_as_treasury, multi-payment::reset_payment_currency, gigahdx::set_pool_contract, dispenser (set_config/pause/unpause/request_fund guards)

Notes / residual gaps (deliberately not faked):

• signet::respond* only echo the caller's input as events — no on-chain signature validation, no authority gate, no pause check. Tests assert what exists; the missing gating is a finding worth a follow-up.
• dispenser::request_fund happy path needs a signet MPC signing flow (keccak-derived request id) — impractical in integration; covered by its NotConfigured/Paused guard rejections instead.
• Adds pallet-signet and pallet-dispenser as integration-tests dev-dependencies.

Verified locally: full crate compiles under RUSTFLAGS=-D warnings, cargo fmt --check clean, and all 84 new tests pass. runtime-integration-tests bumped to 1.104.2.

[claude]

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[github-actions]

Crate versions that have been updated:

• runtime-integration-tests: v1.104.0 -> v1.104.2

Runtime version has not been increased.

[Copilot]

Pull request overview

Adds new runtime-level integration tests for previously pallet-only-covered stableswap extrinsics, closing identified gaps in the integration suite and bumping the integration test crate version accordingly.

Changes:

• Add a new stableswap_extra integration test module covering buy, proportional remove_liquidity, withdraw_asset_amount, and authority-gated peg/amp admin extrinsics.
• Wire the new module into the integration test crate (lib.rs).
• Bump runtime-integration-tests from 1.104.0 to 1.104.1 (and update Cargo.lock).

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
integration-tests/src/stableswap_extra.rs	Adds 8 new runtime integration tests for stableswap trading, liquidity withdrawal, and admin peg/amp updates.
integration-tests/src/lib.rs	Registers the new stableswap_extra module in the integration test crate.
integration-tests/Cargo.toml	Bumps runtime-integration-tests crate version to 1.104.1.
Cargo.lock	Updates lockfile entry for the runtime-integration-tests version bump.

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[github-actions]

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