Glossary: the words of research 053's graduation, and harness and role as homonyms

Playbook 02 adds a graduated effort's words; design 58 now says agent harness, never the bare word.

00-META/glossary.md

@@ -101,8 +101,8 @@ are a published vocabulary, fixed by the manifest's schema. **Decided by** ADR 0
   (ADR 0188).
 - **tool** — one capability a module serves through the tool runner, addressed `<module>.<tool>`. A
   seat's **verb** is the same thing carried by a seat rather than a module.
-- **mesh-sdk** — the library a module's own code is written against, including the harness that serves a
-  tools bundle to the tool runner. The harness is part of it, not a library of its own.
+- **mesh-sdk** — the library a module's own code is written against, including the SDK harness that serves a
+  tools bundle to the tool runner. The SDK harness is part of it, not a library of its own.
   *Not:* ~~tools-sdk~~
 - **invokes** — the manifest word for the tools a module calls, `<module>.<tool>` each or `*` for every
   one. A grant on the publish side and nothing else; a module that declares none calls nothing.
@@ -270,8 +270,8 @@ and Health and repair. **Decided by** ADR 0100, 0126, 0176, 0181, 0207, 0221, 02
 **Purpose.** To issue, hold, rotate and check the credentials and grants by which modules, nodes, agents
 and the operator act. **Recorded by** the controller's `identity` and `licences` databases and the vault.
 **Upstream of** Provisioning, Change and delivery, and Operator and conversation.
-**Decided by** ADR 0085, 0113, 0183, 0225, 0234.
-**Uses:** module, node, operator, consumer (Provisioning).
+**Decided by** ADR 0085, 0113, 0183, 0225, 0234, 0386, 0387, 0388.
+**Uses:** module, node, operator, consumer (Provisioning), agent (Operator and conversation), tool (Module).
 
 - **credential** — anything that proves an identity: a password, a key, a token. A **pair credential**
   is the two ends of one credential, the consumer's and the provider's.
@@ -283,8 +283,24 @@ and the operator act. **Recorded by** the controller's `identity` and `licences`
   (ADR 0283).
 - **vault** — the module that owns every secret (`mesh-vault`,
   [24 — The secrets vault](../03-DESIGN/01-to-be/24-the-secrets-vault.md)).
-- **grant** — what an identity may call or reach, bounded by the provisions it requires
-  (ADR 0225).
+- **identity** — a person, an agent or a module as the mesh knows it: a name, a kind, a role, and whether it
+  is switched on. Every identity and role is held by the identity seat, in the bus's key-value store, and
+  changes only through its verbs (ADR 0386).
+- **role** — what an identity may call, as a set of grants (ADR 0386). Not a seat: a bare *role* is a
+  homonym (see [Homonyms](#homonyms)).
+- **grant** — one line of a role: an effect everywhere, an effect on one seat, or one named tool, and may be
+  limited to named machines; a dangerous tool is granted only by name (ADR 0386). A module's grants
+  come from what its manifest declares it calls, bounded by the provisions it requires (ADR 0225).
+- **effect** — a tool's mark, set by its module in its manifest: **reads**, **acts** or **dangerous**; a
+  tool served without one counts as dangerous (ADR 0387).
+- **break-glass agent** — the one agent that holds every tool and never asks: sealed until the operator, or
+  a condition the operator named, opens it, open until the operator closes it, and every act it takes told
+  at once (ADR 0387).
+- **signed login** — a bus login signed by a key the bus trusts, carrying its expiry, which the bus checks by
+  its signature instead of reading a list (ADR 0388). The identity seat signs with one **signing key** per
+  role.
+- **root key** — the key at the top of the signed logins, which vouches for the signing keys: sealed in the
+  vault and used only to replace them, on the operator's Approve (ADR 0388).
 - **bus account** and **membership** — a module's or a node's account on the bus, and the subjects it
   is issued. The bus server calls its accounts *users*; the mesh says bus account.
 - **rotate** — replacing a credential without a consumer holding one the provider does not know.
@@ -503,7 +519,7 @@ it should not. **Recorded by** the controller. **Upstream of** Provisioning and
 trust. **Recorded by** the router (asks, warrants and the operator's identities).
 **Downstream of** Health and repair, Change and delivery, and Identity and access. An authorising
 answer acts in whichever domain asked, through that domain's own verb; the conversation owns the
-asking, never the act. **Decided by** ADR 0152, 0175, 0234, 0259, 0272.
+asking, never the act. **Decided by** ADR 0152, 0175, 0234, 0259, 0272, 0383, 0384, 0385, 0390.
 **Uses:** operator, person, proof (Identity and access), release (Change and delivery).
 
 - **mesh MCP server** — the endpoint on a node's loopback through which every agent and person on that
@@ -559,8 +575,21 @@ asking, never the act. **Decided by** ADR 0152, 0175, 0234, 0259, 0272.
   instructions.
 - **reference** — an opaque token in a message's words standing for a detail the content rule keeps out
   of them (a path, an address); opened with `detail` only on a `private` channel or through the mesh MCP server.
-- **agent** — a coding agent: the operator's, or one the mesh runs. Not the node-engine, and not the
+- **agent** — a coding agent: the operator's, or one the mesh runs; to the mesh, an identity of kind agent
+  (ADR 0386). Not the node-engine, and not the
   build seat's holder, whose seat name `node-build-agent` is an identifier to rename.
+- **thread** — one line of agent work, owned by the mesh: its turns, tool calls and results, its workspace
+  and usage, kept whole for good on the bus by the thread seat; it outlives any session, node or front end
+  (ADR 0383).
+- **session** — one run of an agent harness on a thread.
+- **agent harness** — the program that runs an agent's sessions, its context manager and loop: Claude Code
+  today (ADR 0384). Not the SDK harness (see [Homonyms](#homonyms)).
+- **thread handler** — the node seat whose holder runs threads' sessions headless, on the always-on nodes
+  (ADR 0384).
+- **workspace toolkit** — the tools a session works with on its thread's workspace, the same for every agent
+  harness: the node seat `workspace` (ADR 0385).
+- **sandbox** — the small virtual machine one session runs in, with its thread's workspace mounted
+  (ADR 0390).
 - **instruction section** — one named section of the managed instruction file, which every agent session on the
   nodes it is for reads first, as the mesh's word: set at the controller's terminal in the agent module's
   settings, or **proposed** by an agent and made active on each node only by the operator's warrant, which that node
@@ -624,7 +653,7 @@ Not a domain of the mesh but of the way it is built, listed because its words me
   `changed`, `superseded`): a later record may change one clause and leave the rest
   (ADR 0290). Not a *rule*, which is a line of
   `00-META/how-we-build.md`.
-- **knowledge base** — the role that holds the decision records and research efforts whole (number, status, topic,
+- **knowledge base** — what holds the decision records and research efforts whole (number, status, topic,
   typed links, clauses and reasoning, with every version), takes them as proposals, has them reviewed and accepted,
   and answers what holds: the seat `knowledge-base`, held by the module `mesh-knowledge`
   ([55 — The knowledge base](../03-DESIGN/01-to-be/55-the-knowledge-base.md)). Not **the record**, the literal reader
@@ -634,7 +663,7 @@ Not a domain of the mesh but of the way it is built, listed because its words me
   holds it whole: its report, diagnosis and resolution included (ADR 0291);
   the folders in `04-ISSUES/` are imported there and removed.
   An **incident** is a past event that taught a rule.
-- **issue tracker** — the role that holds the mesh's issues and hands out their numbers: the seat `issue-tracker`,
+- **issue tracker** — what holds the mesh's issues and hands out their numbers: the seat `issue-tracker`,
   held by the module `mesh-issues` ([53 — The issue tracker](../03-DESIGN/01-to-be/53-the-issue-tracker.md)).
   Not hits's *item*; bare *ticket* is a homonym (see [Homonyms](#homonyms)).
   *Not:* ~~ticketing system~~ (hq), ~~ticket system~~ (hq)
@@ -688,6 +717,10 @@ renaming one sense, the old sense moves to a *Not:* line and becomes mechanical.
 | tier | a level of the mesh | **layer** | Core |
 | | a step of a rollout | **tier** | Change and delivery |
 | | how much proof an ask needs | **assurance level** | Identity and access |
+| harness | the part of `mesh-sdk` that serves a tools bundle | **SDK harness** | Module |
+| | the program that runs an agent's sessions | **agent harness** | Operator and conversation |
+| role | what a seat names, at a scope | **seat** | Module |
+| | what an identity may call | **role** | Identity and access |
 | ask | a request for the operator's input | **ask** | Operator and conversation |
 | | an entry in the build queue | **build request** | Change and delivery |
 | store | the one database server | **store** | Core |