Task: Integrate Learning download size removal

Identity

Merge verified source commit 8509084 into the integration branch.
Promote the accepted Learning download behavior into ADR-005, architecture, domain rules, success criteria, README, server contract, current state, evidence, and the pending production-smoke commitment.
Advance local main without overwriting its pre-existing untracked task record.

Follow the user's explicit decision that project downloads must not perform archive-size validation.
Preserve Main ownership of authentication, fixed archive routes, same-origin redirects, native destination selection, SHA-256, ZIP signature, temporary files, cleanup, and atomic rename.
Keep the Works Square upload/storage size policy distinct from client download behavior: the service may retain an independent operations upload limit, but Makelore does not enforce it while downloading.
Do not modify, add, remove, or adopt the unrelated untracked record already in the canonical main worktree.

Merged source commit 8509084 through integration merge 0c1a360.
Promoted the no-size-validation behavior into ADR-005, the decision index, system overview, module map, data flow, domain rules, glossary, success criteria, current state, evidence index, README, server collaboration contract, and Learning production-smoke commitment.
Kept the optional 512 MiB rule only as an independent Works Square operations upload/storage policy; Makelore does not enforce it during download.
Preserved SHA-256, ZIP signature, same-origin redirects, account binding, temporary-file cleanup, and atomic save.

Pinned pnpm 10.33.4 frozen install: passed.
Focused Learning tests: 2 files, 17 passed.
Full unit suite: first run had one unrelated Robot async-loading test failure; that test passed immediately in isolation, and the complete rerun passed 176 files / 2061 tests.
pnpm run typecheck: passed.
pnpm run lint:check: passed with zero errors and six pre-existing warnings.
pnpm run build:vite: passed for Renderer, Main, Preload, and utility worker; existing dynamic-import and chunk-size advisories only.
Canonical size-rule scan and git diff --check: passed.
Independent sub-agent review was not run because the user explicitly required that no sub-agents be created; final integration review stayed in the primary task.

Package and smoke the merged client with a real archive response that omits or misreports Content-Length.
Monitor disk-space behavior for very large archives because the client now has no archive-size ceiling by explicit product decision.