[feat](trx-frontend-http): separate transmit permission

Assisted-By: Codex (GPT-5)
Signed-off-by: Stan Grams <sjg@haxx.space>

docs/Architecture.md

@@ -926,8 +926,9 @@ main
 ### HTTP Frontend Auth
 
 - Optional Argon2id-backed managed accounts with HttpOnly session cookies
-- An exclusive Guest role plus composable Read, Control, Write, and Administrator roles, with policy shared by middleware and handlers
+- An exclusive Guest role plus composable Read, Control, Transmit, Write, and Administrator roles, with policy shared by middleware and handlers
 - Guest sessions receive read-only station access but no account-control endpoints or panels
+- Transmit separately gates PTT, TX audio frames, and TX power-limit changes
 - Atomic JSON persistence with migration from the legacy single-role schema
 - Account enable/disable, administrator CRUD, self-service password changes, and session revocation on security changes
 - A database invariant always preserves at least one enabled administrator

docs/Planned-Features.md

@@ -541,8 +541,8 @@ setting, which is also what LoTW's station locations expect.
 rotate operators through one station callsign, which is why contest loggers record it per QSO.
 It is stored per QSO, defaulted from the configured callsign so a single operator never touches
 it, and changed on the station line at the top of the panel where it sticks for the session.
-It cannot be taken from the session's identity: the auth roles are `admin` and `user`, with no
-notion of who is logged in.
+It cannot be inferred from the session's identity: an account username need not be an operator
+callsign, and operational accounts may be shared.
 
 **Server clock, and the log says so.** The server is the machine at the radio; the browser may
 be on a phone in another timezone with a clock nobody has checked. QSO times are UTC from the

docs/UX_Guidelines.md

@@ -127,7 +127,7 @@ When auth is enabled, an **auth gate** blocks the UI with:
 - Role badge display
 
 **Guest** provides read-only station access and is exclusive. Non-Guest accounts
-may combine **Read**, **Control**, **Write**, and **Administrator** roles.
+may combine **Read**, **Control**, **Transmit**, **Write**, and **Administrator** roles.
 Administrator implies all permissions.
 
 Session cookie: `trx_http_sid`, HttpOnly, configurable Secure and SameSite attributes.
@@ -337,13 +337,14 @@ Logo and favicon are embedded at compile time via `include_bytes!`. The logo ima
 
 ### 7.1 Route Access Classification
 
-Routes are classified into three tiers:
+Routes are classified into access tiers:
 
 | Tier | Examples | Requirement |
 |---|---|---|
 | **Public** | `/`, `/index.html`, `/map`, login/session endpoints, static assets | None |
-| **Read** | `/status`, `/events`, `/audio`, `/decode`, `/spectrum`, `/bookmarks` | Guest, Read, Control, or Administrator role |
-| **Control** | `/set_freq`, `/set_mode`, `/set_ptt`, `/toggle_power`, radio-control POST routes | Control or Administrator role |
+| **Read** | `/status`, `/events`, `/audio`, `/decode`, `/spectrum`, `/bookmarks` | Guest, Read, Control, Transmit, or Administrator role |
+| **Control** | `/set_freq`, `/set_mode`, `/toggle_power`, receive-side radio-control POST routes | Control or Administrator role |
+| **Transmit** | `/set_ptt`, `/set_tx_limit`, outbound `/audio` frames | Transmit or Administrator role |
 | **Write** | Logbook access and bookmark mutations | Write or Administrator role |
 
 ### 7.2 Session Management

docs/User-Manual.md

@@ -593,7 +593,8 @@ The HTTP frontend supports an optional user/password ACL:
 
 - **Guest** — read-only station access with no Account or Users controls; Guest cannot be combined with another role
 - **Read** — monitoring, audio, decode streams, and bookmark reads
-- **Control** — full radio receive/transmit controls
+- **Control** — tuning, mode, power, and receive-side radio controls
+- **Transmit** — PTT, transmitted audio, and TX power-limit controls
 - **Write** — logbook access and bookmark changes
 - **Administrator** — user management and all other permissions
 
@@ -644,8 +645,9 @@ credentials in configuration before first startup on an exposed deployment.
 | `/auth/users` | GET/POST | List or add users (admin only) |
 | `/auth/users/{username}` | PATCH/DELETE | Change enabled state/password/roles or remove user (administrator only) |
 
-Read routes accept Guest or require Read. Radio mutations require Control. Logbook access and
-bookmark mutations require Write. Administrator grants every permission.
+Read routes accept Guest or require Read. Tuning and receive-side radio mutations
+require Control. PTT, transmitted audio, and TX limit changes require Transmit.
+Logbook access and bookmark mutations require Write. Administrator grants every permission.
 
 ### Frontend Flow