supabase / cli / 32736691992
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feat(config): expose config defaults and provide sparse mapping functions (#6205)

Implements [CLI-2155](https://linear.app/supabase/issue/CLI-2155): a
stored reference of config default values and a mapping function that
omits values matching them, so `config diff` (CLI-2156) and `config
pull` (CLI-2064) can compare sparse configs instead of full effective
ones.

## What changed

**New API in `@supabase/config`** (`packages/config/src/sparse.ts`, all
pure and synchronous, operating on decoded `ProjectConfig` values):

- `getDefaultProjectConfig()` — the default config, derived by decoding
`{}` through `ProjectConfigSchema` (memoized). The schema's existing
`default` annotations and decoding defaults remain the single source of
truth; there is no hand-maintained defaults table to drift.
- `subtractProjectConfig(config, baseline)` — returns the sparse config
`config − baseline`: strict deep equality (order-sensitive arrays),
sections emptied by subtraction dropped recursively. Directional, so
CLI-2156 can subtract a remote block against the merged base config.
- `omitDefaultValues(config)` — `subtractProjectConfig` with the default
config as baseline. The result is itself a valid config document:
re-decoding refills the removed defaults, yielding the same effective
config under the current schema's defaults. `[remotes.*]` blocks (config
overrides for a specific persistent Supabase branch, bound by
`project_id`) pass through untouched — pruning them against global
defaults would silently change what a branch resolves to.

**Refactor:** `io.ts` had a private `stripDefaults`/`isEqualValue` walk
used for writing minimal config files; that walk is now the shared
`subtractValue` core in `sparse.ts`, consumed by both the new API and
the save path, so there is one subtraction implementation in the
package.

**Design docs:** ADR 0018 (`docs/adr/0018-sparse-config-subtraction.md`)
records the decision, the remote-block baseline rule, what the output is
depending... (continued)

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