Websocket refactoring: allow lazy async connections (#78)

In preparation for migrating the async API over to using
the AsyncWebsocketHandler API (instead of using the httpx-ws
instance API directly), rework the task scheduling so the
websocket handlers run inside one task group per client.

Since the task manager's additional tasks group will own the
handlers, it will no longer matter exactly which client coroutine
triggers setting up the connection (once the async API migrates
to the new imlementation interface).

CI lock file updates are due to refactoring eliminating the
dependency on the "exceptiongroups" project.

Author: ncoghlan

ci-bootstrap-requirements.txt

@@ -1,42 +1,60 @@
 # This file is @generated by PDM.
 # Please do not edit it manually.
 
-anyio==4.8.0 \
-    --hash=sha256:1d9fe889df5212298c0c0723fa20479d1b94883a2df44bd3897aa91083316f7a \
-    --hash=sha256:b5011f270ab5eb0abf13385f851315585cc37ef330dd88e27ec3d34d651fd47a
+anyio==4.9.0 \
+    --hash=sha256:673c0c244e15788651a4ff38710fea9675823028a6f08a5eda409e0c9840a028 \
+    --hash=sha256:9f76d541cad6e36af7beb62e978876f3b41e3e04f2c1fbf0884604c0a9c4d93c
 blinker==1.9.0 \
     --hash=sha256:b4ce2265a7abece45e7cc896e98dbebe6cead56bcf805a3d23136d145f5445bf \
     --hash=sha256:ba0efaa9080b619ff2f3459d1d500c57bddea4a6b424b60a91141db6fd2f08bc
 certifi==2025.1.31 \
     --hash=sha256:3d5da6925056f6f18f119200434a4780a94263f10d1c21d032a6f6b2baa20651 \
     --hash=sha256:ca78db4565a652026a4db2bcdf68f2fb589ea80d0be70e03929ed730746b84fe
-dep-logic==0.4.11 \
-    --hash=sha256:44cf69b3e0e369315e7d4cafa4a5050aa70666753831bf0c27b7f3eadbcf70ce \
-    --hash=sha256:6084c81ce683943a60394ca0f8531ff803dfd955b5d7f52fb0571b53b930a182
+charset-normalizer==3.4.1 \
+    --hash=sha256:44251f18cd68a75b56585dd00dae26183e102cd5e0f9f1466e6df5da2ed64ea3 \
+    --hash=sha256:6ff8a4a60c227ad87030d76e99cd1698345d4491638dfa6673027c48b3cd395f \
+    --hash=sha256:73d94b58ec7fecbc7366247d3b0b10a21681004153238750bb67bd9012414545 \
+    --hash=sha256:8bfa33f4f2672964266e940dd22a195989ba31669bd84629f05fab3ef4e2d125 \
+    --hash=sha256:91b36a978b5ae0ee86c394f5a54d6ef44db1de0815eb43de826d41d21e4af3de \
+    --hash=sha256:955f8851919303c92343d2f66165294848d57e9bba6cf6e3625485a70a038d11 \
+    --hash=sha256:9f0b8b1c6d84c8034a44893aba5e767bf9c7a211e313a9605d9c617d7083829f \
+    --hash=sha256:aabfa34badd18f1da5ec1bc2715cadc8dca465868a4e73a0173466b688f29dda \
+    --hash=sha256:b010a7a4fd316c3c484d482922d13044979e78d1861f0e0650423144c616a46a \
+    --hash=sha256:b1ac5992a838106edb89654e0aebfc24f5848ae2547d22c2c3f66454daa11971 \
+    --hash=sha256:bc2722592d8998c870fa4e290c2eec2c1569b87fe58618e67d38b4665dfa680d \
+    --hash=sha256:d7f50a1f8c450f3925cb367d011448c39239bb3eb4117c36a6d354794de4ce76 \
+    --hash=sha256:d98b1668f06378c6dbefec3b92299716b931cd4e6061f3c875a71ced1780ab85 \
+    --hash=sha256:fd4ec41f914fa74ad1b8304bbc634b3de73d2a0889bd32076342a573e0779e00
+dep-logic==0.5.0 \
+    --hash=sha256:be92e772f15d2563edd6b8694a6818846ad2822310dfc8f39cd20ebb0b03e329 \
+    --hash=sha256:f16a73ec5baf1f126e253f6a6249c80999818e608f84677736591ac623c516a6
 distlib==0.3.9 \
     --hash=sha256:47f8c22fd27c27e25a65601af709b38e4f0a45ea4fc2e710f65755fa8caaaf87 \
     --hash=sha256:a60f20dea646b8a33f3e7772f74dc0b2d0772d2837ee1342a00645c81edf9403
-exceptiongroup==1.2.2 \
+exceptiongroup==1.2.2; python_version < "3.11" \
     --hash=sha256:3111b9d131c238bec2f8f516e123e14ba243563fb135d3fe885990585aa7795b \
     --hash=sha256:47c2edf7c6738fafb49fd34290706d1a1a2f4d1c6df275526b62cbb4aa5393cc
-filelock==3.17.0 \
-    --hash=sha256:533dc2f7ba78dc2f0f531fc6c4940addf7b70a481e269a5a3b93be94ffbe8338 \
-    --hash=sha256:ee4e77401ef576ebb38cd7f13b9b28893194acc20a8e68e18730ba9c0e54660e
+filelock==3.18.0 \
+    --hash=sha256:adbc88eabb99d2fec8c9c1b229b171f18afa655400173ddc653d5d01501fb9f2 \
+    --hash=sha256:c401f4f8377c4464e6db25fff06205fd89bdd83b65eb0488ed1b160f780e21de
 findpython==0.6.3 \
     --hash=sha256:5863ea55556d8aadc693481a14ac4f3624952719efc1c5591abb0b4a9e965c94 \
     --hash=sha256:a85bb589b559cdf1b87227cc233736eb7cad894b9e68021ee498850611939ebc
 h11==0.14.0 \
     --hash=sha256:8f19fbbe99e72420ff35c00b27a34cb9937e902a8b810e2c88300c6f0a3b699d \
     --hash=sha256:e3fe4ac4b851c468cc8363d500db52c2ead036020723024a109d37346efaa761
-hishel==0.1.1 \
-    --hash=sha256:1f6421b78cc23fc43c610f651b7848c9b8eee2d29551d64a2ab0d45b319b6559 \
-    --hash=sha256:5b51acc340303faeef2f5cfc1658acb1db1fdc3e3ad76406265a485f9707c5d6
-httpcore==1.0.7 \
-    --hash=sha256:8551cb62a169ec7162ac7be8d4817d561f60e08eaa485234898414bb5a8a0b4c \
-    --hash=sha256:a3fff8f43dc260d5bd363d9f9cf1830fa3a458b332856f34282de498ed420edd
+hishel==0.1.2 \
+    --hash=sha256:6643450bfb1cfa2ecd6002769f6f5069d0d048c9c1f1e29a98a48302d5875092 \
+    --hash=sha256:802b4e446017f4867efdb26d3417670991ad1b4826d24331110871fe8957b5d0
+httpcore==1.0.8 \
+    --hash=sha256:5254cf149bcb5f75e9d1b2b9f729ea4a4b883d1ad7379fc632b727cec23674be \
+    --hash=sha256:86e94505ed24ea06514883fd44d2bc02d90e77e7979c8eb71b90f41d364a1bad
 httpx[socks]==0.28.1 \
     --hash=sha256:75e98c5f16b0f35b567856f597f06ff2270a374470a5c2392242528e3e3e42fc \
     --hash=sha256:d909fcccc110f8c7faf814ca82a9a4d816bc5a6dbfea25d6591d6985b8ba59ad
+id==1.5.0 \
+    --hash=sha256:292cb8a49eacbbdbce97244f47a97b4c62540169c976552e497fd57df0734c1d \
+    --hash=sha256:f1434e1cef91f2cbb8a4ec64663d5a23b9ed43ef44c4c957d02583d61714c658
 idna==3.10 \
     --hash=sha256:12f65c9b470abda6dc35cf8e63cc574b1c52b11df2c86030af0ac09b01b13ea9 \
     --hash=sha256:946d195a0d259cbba61165e88e65941f16e9b36ea6ddb97f00452bae8b1287d3
@@ -74,30 +92,33 @@ msgpack==1.1.0 \
 packaging==24.2 \
     --hash=sha256:09abb1bccd265c01f4a3aa3f7a7db064b36514d2cba19a2f694fe6150451a759 \
     --hash=sha256:c228a6dc5e932d346bc5739379109d49e8853dd8223571c7c5b55260edc0b97f
-pbs-installer==2025.3.11 \
-    --hash=sha256:150986b56648e2d04e99fafe24c165fa94cfa8385b93d6bf9b82925c3d57d064 \
-    --hash=sha256:c5d17afdb41abbec2afda815d41a93276887f19e6bdc16e98b2dfed11d845968
-pdm==2.22.4 \
-    --hash=sha256:2859a1f788fee571803a0f1f27d6d05dbc95267a071d7f2e01c230c58836d971 \
-    --hash=sha256:8483f3d2285039cea7e07c5ba6ac7e1fcba358129f8831fb75065a797d27b923
-platformdirs==4.3.6 \
-    --hash=sha256:357fb2acbc885b0419afd3ce3ed34564c13c9b95c89360cd9563f73aa5e2b907 \
-    --hash=sha256:73e575e1408ab8103900836b97580d5307456908a03e92031bab39e4554cc3fb
+pbs-installer==2025.4.9 \
+    --hash=sha256:15755bc94769a544af5dda155f973c70caf76f0e70b21f3c8a8ed506f102f88f \
+    --hash=sha256:af110b398248584422f46760ce1e3793622fe3fbcde47aacd22e35baf8c3db1d
+pdm==2.23.1 \
+    --hash=sha256:202c217eef140f7fe933f2025cc2a7a7cc0638abe43c51c4a74d3c1aa686d6f7 \
+    --hash=sha256:cf12cd2201df78a6543a5485ac1d7015a73b3a6b10c98b66dfae6ebd481386fe
+platformdirs==4.3.7 \
+    --hash=sha256:a03875334331946f13c549dbd8f4bac7a13a50a895a0eb1e8c6a8ace80d40a94 \
+    --hash=sha256:eb437d586b6a0986388f0d6f74aa0cde27b48d0e3d66843640bfb6bdcdb6e351
 pygments==2.19.1 \
     --hash=sha256:61c16d2a8576dc0649d9f39e089b5f02bcd27fba10d8fb4dcc28173f7a45151f \
     --hash=sha256:9ea1544ad55cecf4b8242fab6dd35a93bbce657034b0611ee383099054ab6d8c
 pyproject-hooks==1.2.0 \
     --hash=sha256:1e859bd5c40fae9448642dd871adf459e5e2084186e8d2c2a79a824c970da1f8 \
     --hash=sha256:9e5c6bfa8dcc30091c74b0cf803c81fdd29d94f01992a7707bc97babb1141913
-python-dotenv==1.0.1 \
-    --hash=sha256:e324ee90a023d808f1959c46bcbc04446a10ced277783dc6ee09987c37ec10ca \
-    --hash=sha256:f7b63ef50f1b690dddf550d03497b66d609393b40b564ed0d674909a68ebf16a
+python-dotenv==1.1.0 \
+    --hash=sha256:41f90bc6f5f177fb41f53e87666db362025010eb28f60a01c9143bfa33a2b2d5 \
+    --hash=sha256:d7c01d9e2293916c18baf562d95698754b0dbbb5e74d457c45d4f6561fb9d55d
+requests==2.32.3 \
+    --hash=sha256:55365417734eb18255590a9ff9eb97e9e1da868d4ccd6402399eaf68af20a760 \
+    --hash=sha256:70761cfe03c773ceb22aa2f671b4757976145175cdfca038c02654d061d6dcc6
 resolvelib==1.1.0 \
     --hash=sha256:b68591ef748f58c1e2a2ac28d0961b3586ae8b25f60b0ba9a5e4f3d87c1d6a79 \
     --hash=sha256:f80de38ae744bcf4e918e27a681a5c6cb63a08d9a926c0989c0730bcdd089049
-rich==13.9.4 \
-    --hash=sha256:439594978a49a09530cff7ebc4b5c7103ef57baf48d5ea3184f21d9a2befa098 \
-    --hash=sha256:6049d5e6ec054bf2779ab3358186963bac2ea89175919d699e378b99738c2a90
+rich==14.0.0 \
+    --hash=sha256:1c9491e1951aac09caffd42f448ee3d04e58923ffe14993f6e83068dc395d7e0 \
+    --hash=sha256:82f1bc23a6a21ebca4ae0c45af9bdbc492ed20231dcb63f297d6d1021a9d5725
 shellingham==1.5.4 \
     --hash=sha256:7ecfff8f2fd72616f7481040475a65b2bf8af90a56c89140852d1120324e8686 \
     --hash=sha256:8dbca0739d487e5bd35ab3ca4b36e11c4078f3a234bfce294b0a0291363404de
@@ -128,12 +149,15 @@ tomlkit==0.13.2 \
 truststore==0.10.1 \
     --hash=sha256:b64e6025a409a43ebdd2807b0c41c8bff49ea7ae6550b5087ac6df6619352d4c \
     --hash=sha256:eda021616b59021812e800fa0a071e51b266721bef3ce092db8a699e21c63539
-typing-extensions==4.12.2 \
-    --hash=sha256:04e5ca0351e0f3f85c6853954072df659d0d13fac324d0072316b67d7794700d \
-    --hash=sha256:1a7ead55c7e559dd4dee8856e3a88b41225abfe1ce8df57b7c13915fe121ffb8
-unearth==0.17.2 \
-    --hash=sha256:0b8a2afd3476f1ab6155fc579501ac47fffe43547d88a70e5a5b76a7fe6caa2c \
-    --hash=sha256:4d21af1238a583835fca156322f7225382e718cdcc42d6278050a88e605c4ad5
-virtualenv==20.29.3 \
-    --hash=sha256:3e3d00f5807e83b234dfb6122bf37cfadf4be216c53a49ac059d02414f819170 \
-    --hash=sha256:95e39403fcf3940ac45bc717597dba16110b74506131845d9b687d5e73d947ac
+typing-extensions==4.13.2 \
+    --hash=sha256:a439e7c04b49fec3e5d3e2beaa21755cadbbdc391694e28ccdd36ca4a1408f8c \
+    --hash=sha256:e6c81219bd689f51865d9e372991c540bda33a0379d5573cddb9a3a23f7caaef
+unearth==0.17.5 \
+    --hash=sha256:9963e66b14f0484644c9b45b517e530befb2de6a8da4b06a9a38bed2d086dfe6 \
+    --hash=sha256:a19e1c02e64b40518d088079c7416fc41b45a648b81a4128aac02597234ee6ba
+urllib3==2.4.0 \
+    --hash=sha256:414bc6535b787febd7567804cc015fee39daab8ad86268f1310a9250697de466 \
+    --hash=sha256:4e16665048960a0900c702d4a66415956a584919c03361cac9f1df5c5dd7e813
+virtualenv==20.30.0 \
+    --hash=sha256:800863162bcaa5450a6e4d721049730e7f2dae07720e0902b0e4040bd6f9ada8 \
+    --hash=sha256:e34302959180fca3af42d1800df014b35019490b119eba981af27f2fa486e5d6