docs: the ACL leaves the roadmap, and the development-name excuse is withdrawn

Four documents brought into line with what landed at 54f0296 and ee3fedf.

HANDOFF section 4 item 5 said the ACL was deliberately last. It is deleted, not
deferred. Authorisation lives upstream at the last proxy hop, decided against a
membership system this repository knows nothing about, so the compiler will
never have a user table, a login form, a session, or a group name in any form --
including as a configuration value, which is how that leak arrives by the side
door. An item left the roadmap rather than moving down it.

Item 4 claimed persistence was the prerequisite for a library of saved designs
and for access control. The second half has been false since the identity
contract landed and was found by reading the anchor rather than recalling it.
Corrected, and item 4 now states the position that follows: the filesystem is
the first store, not a database. Design records are already plain text, already
content-addressed by input_id, and already readable by someone with none of this
software. A directory of them is a store with perfect provenance and no schema
to migrate. SQL earns its way in when there is a query walking files cannot
answer -- "every design by this author since March" is that query, and it
arrives with membership, not before.

"Acceptable for a development name" is withdrawn from HANDOFF section 4 and
WORK-ORDER-004 section 3. The name is production, dev abbreviates Mechanical
Compiler Developers, and it appears on printed material. The posture is
unchanged -- world-reachable, unauthenticated, /m/ not yet gated, STL export
will ship open -- but it is carried openly as open question 10 instead of
excused. The phrase survived three documents and two earlier corrections
because it was plausible and nobody challenged it, which is the same mechanism
that produced the stale ingress paragraph.

Section 0 gains the two new documents, with CONSUMER_INTERFACE_GATES.md marked
read-before-proposing-an-integration: several tempting cross-project moves are
recorded there specifically as things not to build yet, and a successor who
finds them independently will be tempted to solve them. Also a note that
deploy/ now holds the unit and the vhost as they actually run, and that the
repository is the single source of truth -- read a container when you suspect
drift, then fix the drift here rather than on the host.

HANDOFF section 1 and PROCESS section 9 gain the same rule: pct exec runs no
shell. A glob, redirect, pipe or && is expanded by the host shell against the
host's filesystem and the container receives whatever literal survives, so an
unwrapped glob reports "No such file or directory" and reads as a broken
container. Third instance of this class after F-035 and F-036 -- each time the
tool was invoked wrongly and the error named the wrong subject. Not filed as a
new failure: it is the same finding as those two, and a third entry would
record the instance rather than the pattern.

STAGING-STATE records the deployment configuration as committed. The unit had
been marked delivered at deploy/mechcomp.service on 11 SEP while existing only
on the host.

docs/HANDOFF.md

@@ -6,7 +6,7 @@ It is the only handoff you need to read. Dated handoffs in `docs/archive/` are
 historical and are not required reading — do not diff them against this to work
 out what is true. If something here is wrong, correct it here.
 
-Last updated 2026-09-12, after the authorship field landed.
+Last updated 2026-09-12, after the identity contract and the gate register landed.
 
 This line used to carry the commit hash of its own rewrite. It cannot: the
 hash is not known until the commit is made, so the value was always the
@@ -28,6 +28,18 @@ This document is not the first thing to read, despite being the handoff.
 4. This document — where the code stands.
 5. `docs/ACCEPTANCE.md`, `docs/STOCK.md`, `docs/PRECISION.md` — the
    specifications the code is held to.
+6. **`docs/IDENTITY-CONTRACT.md`** — how a visitor's identity arrives, and the
+   boundary that keeps membership out of this application. The only document
+   here written to be read by someone who does not work on this repository.
+7. `docs/CONSUMER_INTERFACE_GATES.md` — cross-project concerns that are open,
+   with owners. Non-normative. **Read it before proposing any integration with
+   a membership or geography system**; several tempting ones are recorded there
+   as things to specifically not build yet.
+
+`deploy/` holds the systemd unit and the nginx vhost as they actually run,
+imported verbatim on 12 SEP and checksum-proven equal to CT 100 and CT 101. The
+repository is the single source of truth: read a container when you suspect it
+has drifted, then fix the drift here rather than on the host.
 
 When documents disagree, `STAGING-STATE.md` wins on facts about the host and
 `FAILURES.md` wins on what was actually observed. This one is corrected.
@@ -58,6 +70,18 @@ into the repository. `.cache/`, `.local/` and `.ssh/` are in `.gitignore` for
 that reason (F-029). Git identity is set `--local` for the same reason —
 `--global` would write into the tree.
 
+**`pct exec` runs no shell.** A glob, a redirect, a pipe or an `&&` in a `pct
+exec` command is expanded by the *host* shell, against the host's filesystem,
+and whatever literal survives is handed to the container as an argument. Wrap
+anything that needs a shell:
+
+    pct exec 101 -- sh -c 'grep -n listen /etc/nginx/sites-enabled/*'
+
+Unwrapped, that glob expands on `srv-b` — where the path does not exist — so the
+container receives a literal `*` and reports "No such file or directory", which
+reads as a broken container and is not. Third of the same kind after F-035 and
+F-036: the tool was invoked wrongly and the error described the wrong subject.
+
 **`verify.sh` is mode `100644`.** Invoke it as `bash tools/reference-toolchain/verify.sh`,
 never `./tools/...`.
 
@@ -169,7 +193,7 @@ terminate rather than recur.
 
 ### The port — COMPLETE
 
-Gitea `main` at `48d5665` before this commit. CT 100 clean and matching.
+Gitea `main` at `ee3fedf` before this commit. CT 100 clean and matching.
 
 **Suite: 547 passed, 0 failed.** The 30 expected failures are gone, resolved
 rather than suppressed, by the tolerance model in `docs/ACCEPTANCE.md`. A red
@@ -261,12 +285,32 @@ so a successor can disagree with the argument rather than only the sequence.
 4. **Persistence.** `MECHCOMP_DATA_DIR=/var/lib/mechcomp` has been declared since
    staging and nothing has ever written to it. Every design currently exists only
    for the duration of one HTTP request. This is the prerequisite for a library
-   of saved designs *and* for access control.
-5. **ACL.** Deliberately last. There is nothing to control until 4 exists —
-   access control over nothing is machinery without a subject. Note that the
-   service is world-reachable and unauthenticated today, which is acceptable for
-   a development name and should be a conscious decision before anything else is
-   published this way.
+   of saved designs. It is **no longer** the prerequisite for access control,
+   which has left this roadmap entirely — but it should be built knowing that a
+   saved design belongs to a person whose identity arrives from outside this
+   application (`IDENTITY-CONTRACT.md` §3).
+
+   The filesystem is the first store, not a database. Design records are already
+   plain text, already content-addressed by `input_id`, and already readable by
+   someone with none of this software installed. A directory of them is a store
+   with perfect provenance and no schema to migrate. SQL earns its way in when
+   there is a query that walking files cannot answer — "every design by this
+   author since March" is that query, and it arrives with membership, not
+   before.
+5. ~~**ACL.**~~ **Deleted, not deferred.** Authorisation lives upstream, at the
+   last proxy hop before this application, decided against a membership system
+   this repository knows nothing about. The compiler will not have a user table,
+   a login form, a session, or a group name in any form — including as a
+   configuration value, which is how that leak arrives by the side door. See
+   `IDENTITY-CONTRACT.md` §9. An item left the roadmap rather than moving down
+   it.
+
+   The service is world-reachable and unauthenticated today, and `/m/` is not
+   yet gated, so STL export will ship open. An earlier version of this item
+   called that "acceptable for a development name". **It is not.** The name is
+   production, `dev` abbreviates *Mechanical Compiler Developers*, and it
+   appears on printed material. The posture is unchanged; the excuse is
+   withdrawn. Carried openly as open question 10 instead of justified.
 
 **Assemblies are not on this list and should not be added.** See `PRECISION.md`
 §7: positioning is field work, ruled out by design on 11 SEP.