feat(cli)!: remove legacy data-plane addressing (--target, positional http→remote, --as-on-served) (#238)

* feat(cli): --server accepts a literal URL (RFC-011 Decision 2)

`resolve_server_flag` now treats a `--server` value containing `://` as a literal
base URL (trailing slash trimmed; `--graph` appends `/graphs/<id>`), bypassing the
operator-config `servers:` registry; a bare name still resolves through the
registry. This is the replacement the upcoming `--uri http(s)://` deprecation
points at, and a small ergonomic win on its own (`--server https://host` with no
config entry). Token resolution for a literal-URL server falls to the legacy
OMNIGRAPH_BEARER_TOKEN chain, same as a positional URL today.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* test(cli): address the parity-matrix arms with global --store/--server flags

Prep for removing the positional-http→remote dispatch. The parity harness
addressed both arms with a positional graph right after the verb
(`omnigraph <verb> <addr> <args…>`), which only parses for top-level verbs —
for nested subcommands (`schema show`, `branch list`, …) the address landed in
the subcommand slot and BOTH arms failed identically, so the test passed
vacuously (matching exit codes, never comparing output).

Address both arms with the global flags instead — local `--store <graph>`
(embedded), remote `--server <url>` (served) — appended after the verb + args,
valid regardless of nesting. The previously-vacuous nested-verb parity checks
now actually compare embedded vs remote (and pass — parity holds), and the
remote arm no longer relies on the positional-URL dispatch that's about to be
removed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* feat(cli)!: --as on a served write is a hard error (was a silent no-op)

A served write resolves the actor server-side from the bearer token, so `--as`
could never set identity there — it was silently ignored. It now errors (in the
remote write factory, before any HTTP call), pointing the user at removing `--as`
or writing directly with `--store`. Reads don't carry `--as`, so this is
write-path only. BREAKING for any script that passed `--as` to a remote write
(it was a no-op, so behavior is unchanged except the now-explicit error).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* feat(cli)!: a positional/--uri http(s):// URL no longer dispatches to a server

Remote graphs must be addressed with `--server <url>` (or a named server / a
profile binding one). A positional or `--uri` `http(s)://` URL on a data verb now
errors instead of silently routing to the remote HTTP client — the scheme no
longer carries transport semantics. The discriminator is `via_server`: a remote
URL produced by a server scope is fine; a remote URL from a positional/`--uri`
source is rejected (`reject_positional_remote` in both GraphClient factories).

Storage verbs are unaffected — they already reject remote URIs through
`resolve_local_graph` with the existing "direct (storage-native)" error.

Migrated the gh-host keyed-credential system test to `--server <url>` (the literal
URL still prefix-matches the operator server for token resolution). BREAKING:
scripts addressing a server by a bare URL must switch to `--server <url>`.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* feat(cli)!: remove the --target flag (use --store / --profile / --server)

Removes the legacy named-graph flag and threads its parameter out of the whole
resolver chain. `--target` resolved a graph name through `omnigraph.yaml`'s
`graphs:` map; its replacements (`--store <uri>`, `--profile <name>`,
`--server <name>`) all ship.

- Drops the 22 `target` clap fields + the `--cluster` exclusion that named it.
- Threads `target`/`cli_target` out of `resolve_uri`/`resolve_cli_graph`/
  `resolve_local_graph`/`resolve_local_uri`/`resolve_storage_uri`/
  `resolve_remote_bearer_token`/`apply_server_flag`/`execute_query_lint`/
  `resolve_selected_graph`/`resolve_registry_selection_for_list`/
  `execute_queries_{validate,list}`, the two `GraphClient` factories, and
  `ScopeFlags`/`ResolvedScope`.
- Keeps the shared `OmnigraphConfig::resolve_target_uri` 3-arg (server boot uses
  it); the CLI passes None for the explicit-target arm. The `cli.graph` default
  (omnigraph.yaml bare-command fallback) is unchanged — its removal belongs to
  the omnigraph.yaml excision.
- Operator/file aliases that bind a `graph` name still work: the name is now
  resolved to a URI inline (a positional URI wins).
- Error messages and `--graph`/`--server`/`--store` help text no longer name
  `--target`; the queries-list selection hint points at `cli.graph`.

BREAKING. Tests updated (named-target resolution rewritten onto `cli.graph`;
positional-URI tests unchanged). Full omnigraph-cli suite green (228).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* docs(cli): drop --target and positional-http addressing; --as-on-served is an error

Update the user docs for the legacy data-plane addressing removals:
- the CLI `--target` flag is gone — address graphs with a positional URI,
  `--store`, `--profile`, or `--server <name|url>`;
- a positional `http(s)://` URI no longer dispatches to a server (use `--server`);
- `--as` on a served write is now rejected (was a silent no-op).

Touches cli/reference.md (addressing intro, capability table, error examples,
scopes), cli/index.md (the remote-read example → --server), operations/maintenance
+ policy, and the cluster docs' data-plane load guidance. The server's own
`--target` boot flag is unchanged (server.md untouched). Also fixes a pre-existing
broken maintenance link in search/indexes.md.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* fix(cli): --store is loudly exclusive with a positional URI / --server; test graphs→Served

Address two Greptile findings on the RFC-011 slices:
- Slice A (P1): `--store` combined with a positional URI silently dropped the URI
  (`scope.rs` did `store.or(uri)`); `--store` + `--server` errored with a
  misleading "positional URI" message. Now both combinations fail loudly with a
  declared `--store is exclusive with a positional URI and --server` error.
- Slice B (P2): the `command_capability` unit test never exercised the one
  Data→Served refinement (`graphs`); added the assertion so deleting that guard
  can't pass silently.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

docs/user/cli/reference.md

@@ -2,7 +2,7 @@
 
 A reference for the `omnigraph` binary's command surface and `omnigraph.yaml` schema. For a quick-start guide, see [cli.md](index.md).
 
-Top-level command families and subcommands. Graph-targeting commands accept a positional `URI`, `--uri`, a `--target <name>` resolved against `omnigraph.yaml`, `--server <name>` (an operator-defined server from `~/.omnigraph/config.yaml`, optionally with `--graph <id>` for multi-graph servers; exclusive with the other forms), `--store <uri>` (a single graph's storage directly), or `--profile <name>` / `$OMNIGRAPH_PROFILE` (a named scope bundle; see [Scopes & profiles](#scopes--profiles-rfc-011)); `cluster` commands use `--config <dir>`.
+Top-level command families and subcommands. Graph-targeting commands accept a positional `file://`/`s3://` URI, `--server <name|url>` (an operator-defined server from `~/.omnigraph/config.yaml` by name, or a literal `http(s)://` URL, optionally with `--graph <id>` for multi-graph servers; exclusive with a positional URI), `--store <uri>` (a single graph's storage directly), or `--profile <name>` / `$OMNIGRAPH_PROFILE` (a named scope bundle; see [Scopes & profiles](#scopes--profiles-rfc-011)); `cluster` commands use `--config <dir>`. A remote server is addressed only with `--server` — a positional `http(s)://` URI is rejected.
 
 ## Top-level commands
 
@@ -32,19 +32,20 @@ Top-level command families and subcommands. Graph-targeting commands accept a po
 
 Every command declares the **capability** it needs — what it requires to reach a graph — which determines the addressing flags that apply:
 
-- **`any`** — `query`, `mutate`, `load`, `ingest`, `branch *`, `snapshot`, `export`, `commit *`, `schema show`, `schema apply`. Run against a graph **served (via a server) or embedded (direct against a store)**: accept a positional `URI` / `--target` / `--server` (+ `--graph` for multi-graph servers) / `--store` / `--profile`.
+- **`any`** — `query`, `mutate`, `load`, `ingest`, `branch *`, `snapshot`, `export`, `commit *`, `schema show`, `schema apply`. Run against a graph **served (via a server) or embedded (direct against a store)**: accept a positional `file://`/`s3://` URI, `--server <name|url>` (+ `--graph <id>` for multi-graph servers), `--store <uri>`, or `--profile <name>`. A remote server is addressed with `--server` — a positional `http(s)://` URI does **not** dispatch to one.
 - **`served`** — `graphs list`. Requires a server (accepts `--server` / `--profile`).
-- **`direct`** — `init`, `optimize`, `repair`, `cleanup`, `schema plan`, `queries validate`, `lint`. Need **direct storage access** (`file://` / `s3://`), never through a server. They accept a positional `URI` or `--target`, but **not** `--server` / `--graph`, and a `--target` that resolves to a remote (`http(s)://`) server is rejected. (`init` takes only a positional `URI` today — no `--target`.) `optimize` / `repair` / `cleanup` also accept **`--cluster <dir|s3://…> --cluster-graph <id>`**, which resolves the graph's storage URI from the served cluster state (so you needn't know the `<storage>/graphs/<id>.omni` layout).
+- **`direct`** — `init`, `optimize`, `repair`, `cleanup`, `schema plan`, `queries validate`, `lint`. Need **direct storage access** (`file://` / `s3://`), never through a server. They accept a positional `URI`, but **not** `--server` / `--graph`, and a remote (`http(s)://`) URI is rejected. `optimize` / `repair` / `cleanup` also accept **`--cluster <dir|s3://…> --cluster-graph <id>`**, which resolves the graph's storage URI from the served cluster state (so you needn't know the `<storage>/graphs/<id>.omni` layout).
 - **`control`** — `cluster *`. Operates on a cluster directory via `--config <dir>`.
 - **`local`** — `policy *`, `embed`, `login`, `logout`, `config`, `version`, `queries list`. Address no graph.
 
 These restrictions are enforced and reported, not silent:
 
-- A served-graph flag (`--server` / `--graph`) on a verb that doesn't reach a graph through a server fails loudly, e.g.: ``optimize is a direct (storage-native) command; --server/--graph address a served graph and do not apply. Use --target <name>, a storage URI, or --cluster <dir> --cluster-graph <id>.``
-- A `direct` verb pointed at a remote target fails loudly, e.g.: ``optimize is a direct (storage-native) command and needs direct storage access; the resolved target is a remote server (https://…). Pass the graph's file:// or s3:// URI.``
+- A served-graph flag (`--server` / `--graph`) on a verb that doesn't reach a graph through a server fails loudly, e.g.: ``optimize is a direct (storage-native) command; --server/--graph address a served graph and do not apply. Pass a storage URI, or --cluster <dir> --cluster-graph <id>.``
+- A `direct` verb pointed at a remote URI fails loudly, e.g.: ``optimize is a direct (storage-native) command and needs direct storage access; the resolved target is a remote server (https://…). Pass the graph's file:// or s3:// URI.``
+- A data verb pointed at a positional `http(s)://` URI fails loudly: ``a remote graph must be addressed with --server <url> — a positional (or --uri) http(s):// URL no longer dispatches to a server.``
 - `init` into an **established cluster's** storage layout (`<root>/graphs/<id>.omni` where `<root>` holds `__cluster/state.json`) is refused — graphs in a cluster are created by `cluster apply` (which records ledger / recovery / approvals), not `init`.
 
-To maintain a server-backed graph, run the `direct` verbs from a host with storage access against the graph's storage URI (`--target`, or `--cluster … --cluster-graph …`), out-of-band from the serving process — there are no server routes for `optimize` / `repair` / `cleanup` by design.
+To maintain a server-backed graph, run the `direct` verbs from a host with storage access against the graph's storage URI (a positional URI, or `--cluster … --cluster-graph …`), out-of-band from the serving process — there are no server routes for `optimize` / `repair` / `cleanup` by design.
 
 `omnigraph --help` lists commands with a **capability legend** at the bottom (any / served / direct / control / local).
 
@@ -92,7 +93,7 @@ newer CLI works on an older one). `$OMNIGRAPH_CONFIG=<path>` stands in for
 A command resolves a **scope** — a server, a cluster, or a store — then selects a
 graph in it; the served-vs-direct access path is derived from the scope, not
 toggled. The scope comes from one of (highest precedence first): an explicit
-address (a positional URI, `--target`, `--server`, or `--store <uri>`); a named
+address (a positional URI, `--server`, or `--store <uri>`); a named
 `--profile <name>` (or `$OMNIGRAPH_PROFILE`); or the flat `defaults.server` +
 `defaults.default_graph`. A **profile** binds exactly one of `server` / `cluster`
 / `store` plus an optional default graph — config data, not state: every command
@@ -105,9 +106,9 @@ resolves its scope fresh, there is no sticky "current" mode.
 - A `server`-bound scope on a maintenance verb, or a `cluster`-bound scope on a
   data verb, is rejected with a message pointing at the right addressing.
 
-This model **coexists** with the legacy addressing (`--uri` / `--target` /
-`--cluster-graph` / `omnigraph.yaml`) — nothing is removed yet; an explicit legacy
-address always wins.
+`--target` and the positional-`http(s)://`→remote dispatch have been **removed**;
+the remaining legacy surfaces (`--cluster-graph`, `omnigraph.yaml`'s `cli.graph`
+default) still work and an explicit address always wins.
 
 #### Credentials keyed by server name