docs: update documentation for non-interactive mode

Add maintainer-model architecture documentation.
Update README to reflect non-interactive default behavior.

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+# Maintainer Model
+
+How ngit handles multi-maintainer repositories: coordinate discovery, maintainer sets, and the distinction between shared metadata and personal infrastructure.
+
+## Coordinate Discovery
+
+A **coordinate** is a `(kind, pubkey, identifier)` tuple that uniquely identifies a repository on nostr. The pubkey in the coordinate is the **trusted maintainer** (typically the original creator).
+
+ngit discovers the coordinate locally from (in priority order):
+
+1. `nostr://` git remotes
+2. `nostr.repo` git config
+3. `maintainers.yaml`
+
+No network access is required to find the coordinate. The coordinate may exist without a corresponding announcement event on relays.
+
+## Maintainer Set
+
+Each repository announcement (kind 30617) contains a `maintainers` tag listing public keys. These form a recursive set: if Alice lists Bob, and Bob lists Carol, then {Alice, Bob, Carol} are all in the maintainer set.
+
+Each maintainer independently decides who they list. Adding someone to your maintainers tag is an invitation to co-maintain.
+
+## Consuming vs Publishing
+
+The key architectural distinction is between **consuming** repository data (fetching, cloning, listing) and **publishing** it (`ngit init`).
+
+### Consuming: Union Across Maintainers
+
+When consuming repo data, `relays`, `clone` (git server URLs), and `blossoms` are **unioned** across all maintainers' announcement events. This means any maintainer can add a mirror git server or relay and all users benefit automatically.
+
+### Publishing: Personal Infrastructure, Shared Metadata
+
+When publishing via `ngit init`, fields are sourced differently depending on their type:
+
+#### Shared Metadata
+
+Sourced from the **latest event** (by `created_at`) across the maintainer set:
+
+- `name`
+- `description`
+- `web`
+- `hashtags`
+
+Rationale: these are shared identity. If any maintainer updates the project name, all subsequent re-announcements should pick it up.
+
+#### Infrastructure (Personal)
+
+Each maintainer has their own infrastructure preferences. When publishing, infrastructure comes from **my own announcement only**, not the union:
+
+- **Grasp servers** -- where my git+nostr data is hosted. Each grasp server derives:
+  - Clone URL: `https://{server}/{npub}/{identifier}.git`
+  - Relay URL: `wss://{server}`
+  - Blossom URL: `https://{server}`
+- **Additional relays, git servers, blossoms** -- beyond what grasp servers provide
+
+Grasp-format clone URLs belonging to other maintainers are kept as additional git servers (they're part of the union for consumers) but are not treated as my grasp servers.
+
+#### Maintainers
+
+Sourced from **my own announcement only**. Each maintainer independently decides who they list.
+
+If I don't have an existing announcement (first time co-maintaining), the default is `[me, trusted_maintainer]`.
+
+#### Earliest Unique Commit
+
+Cascade: my own event's value, then other maintainers' values, then the local root commit. A mismatch between maintainers may indicate a fork.
+
+#### Identifier
+
+From the existing coordinate. Cannot change without `--force` (changing it creates a new repository).
+
+## Init States
+
+When `ngit init` runs, there are 5 possible states based on what exists locally and on relays:
+
+| State | Condition | Behavior |
+|-------|-----------|----------|
+| **Fresh** | No coordinate found | Must provide name + server infrastructure |
+| **Coordinate Only** | Coordinate exists, no announcement on relays | Requires `--force` (could be a relay/network issue) |
+| **My Announcement** | Announcement exists, I'm the trusted maintainer | Re-publish/update, no force needed |
+| **Co-Maintainer** | Announcement exists, I'm listed as maintainer | Publish own announcement, no force needed |
+| **Not Listed** | Announcement exists, I'm not in maintainer set | Requires `--force` |
+
+See `src/bin/ngit/sub_commands/init.rs` (`InitState` enum) and `tests/ngit_init.rs` for the implementation and test coverage.