chore: clean up subscriptions tooling

[dev-jodee]

Summary

• refresh stale README and CLAUDE guidance for the current split workflow, generated client script, and test layout
• tighten Justfile cleanup/build recipes so tracked IDL and generated sources are not removed accidentally
• remove unused webapp polyfill/path plugins and rely on native Vite tsconfig path handling
• align workspace/package cleanup while keeping pnpm audit findings visible without package-level ignores

Test Plan

• just fmt-check
• just lint-check
• just check-generated
• PATH=/tmp/surfpool-v1.2.0:$PATH just test-client
• pnpm --filter webapp test
• pnpm --filter webapp build
• git diff --check
• pnpm audit --json exits 1 with the remaining upstream bigint-buffer and uuid review items, intentionally not ignored

[github-actions]

Compute Unit Report

Instruction	Samples	Min CUs	Max CUs	Avg CUs	Est Cost (Low) [SOL]	Est Cost (Med) [SOL]	Est Cost (High) [SOL]
cancel_subscription	11	1805	2118	2003	0.000005000	0.000005080	0.000006001
close_subscription_authority	7	1881	1916	1886	0.000005000	0.000005075	0.000005943
create_fixed_delegation	38	3616	14121	5071	0.000005001	0.000005202	0.000007535
create_plan	84	3540	12553	5007	0.000005001	0.000005200	0.000007503
create_recurring_delegation	27	3640	9645	4980	0.000005001	0.000005199	0.000007490
delete_plan	8	416	416	416	0.000005000	0.000005016	0.000005208
init_subscription_authority	142	9351	21351	12216	0.000005003	0.000005488	0.000011108
revoke_delegation	19	318	585	420	0.000005000	0.000005016	0.000005210
subscribe	21	6666	11166	7604	0.000005002	0.000005304	0.000008802
transfer_fixed	6	10105	14605	12104	0.000005003	0.000005484	0.000011052
transfer_recurring	17	10212	13303	10773	0.000005003	0.000005430	0.000010386
transfer_subscription	10	10495	12086	11250	0.000005003	0.000005450	0.000010625
update_plan	21	424	500	474	0.000005000	0.000005018	0.000005237

Generated: 2026-04-30